Hs-promoted, ebullated bed or hybrid bed hydroconversion of a feedstock comprising a plastic fraction

Abstract

The present invention relates to a process for hydroconversion of a feedstock comprising a plastic fraction (102), in particular derived from plastic waste, and a heavy hydrocarbon fraction (101) containing a portion of at least 50% by weight, or even at least 80% by weight, having a boiling point of at least 300°C. The hydroconversion uses one or more ebullated bed or hybrid ebullated-entrained bed reactors (20) operating in the presence of hydrogen and H2S, and preferably two successive hydroconversion steps, in order to produce materials of higher quality, with a lower boiling point, for example for the production of fuels, while enabling plastic waste to be upgraded. H2S is used to improve the conversion of the plastic fraction of the feedstock, and is contained in a recycled hydrogen stream resulting from the process, wherein the content of H2S is between 2% and 70% by weight relative to the plastic fraction of the feedstock.

Description

[0001] H2S-PROMOTED BOILING BED OR HYBRID HYDROCONVERSION OF A FEEDSTOCK COMPRISING A PLASTIC FRACTION

[0002] Technical field

[0003] The present invention relates to the field of hydroconversion of feedstocks comprising a plastic fraction, in particular from plastic waste, and a heavy hydrocarbon fraction, in particular a heavy hydrocarbon fraction containing a portion of at least 50% by weight, preferably at least 80% by weight, having a boiling temperature of at least 300°C.

[0004] The heavy hydrocarbon fraction may be crude oil or may be derived from the distillation and / or refining of crude oil, typically topped crude oil, a residue from atmospheric and / or vacuum distillation of crude oil. This heavy hydrocarbon fraction is associated with a plastic(s) fraction.

[0005] In particular, the present invention relates to a process for the hydroconversion of such a mixed feedstock, comprising at least one hydroconversion step using one or more reactors operating in an ebullated bed or in a hybrid ebullated-entrained bed, and preferably two successive hydroconversion steps, with a view to producing higher quality materials, with a lower boiling point, for example for the purposes of fuel production, or for the production of raw materials for petrochemicals, while allowing the recovery of plastic waste.

[0006] Prior art

[0007] For several years, we have seen the emergence of processes in the fuel and chemical sectors incorporating products other than traditional petroleum products, for example products of renewable origin such as lignocellulosic biomass, or even plastic waste products, in addition to or as a substitute for products of fossil origin.

[0008] For example, patent US8623102 is known relating to a process for liquefying biomass chosen from algae, lignocellulosic biomass or one or more constituents of lignocellulosic biomass chosen from the group formed by cellulose, hemicellulose and / or lignin to produce fuel bases, said process comprising two successive hydroconversion stages under high hydrogen pressure in ebullated bed reactors using a supported catalyst of the petroleum residue hydroconversion type and a suspension composed of the biomass and a solvent.

[0009] In particular, in the context of the circular economy and waste reduction, there is a particular focus on plastics, which are traditionally petroleum-derived products, in order to recover them. This recovery of plastic waste may consist of transforming said plastics, by mechanical and / or chemical means, in order to allow the production of plastics or plastic-based objects again. This is then called recycling of plastic waste.

[0010] This recovery of plastic waste can also follow the path of energy recovery, in particular for non-recyclable or difficult to recycle plastic waste, as an alternative, in certain cases, to landfill.

[0011] Typically, energy recovery from plastic waste involves producing energy, in the form of electricity and / or heat. For example, it is known to subject plastics from collection and sorting channels to a pyrolysis step to produce, among other things, plastic pyrolysis oils, which are generally burned to generate electricity and / or used as fuel in industrial boilers or district heating.

[0012] Plastic waste can also be transformed by high-pressure hydrogen hydroconversion processes into hydrocarbon fractions, which can be used in particular as fuels, for example to produce gasoline or diesel, or raw materials for petrochemicals.

[0013] In the field of hydroconversion, i.e. the conversion of hydrocarbon feedstocks under high hydrogen pressure into products with lower boiling point ranges than those of the original feedstock, application WO2020129020 describes a process for hydroconversion of a polymer mixture based on the use of an entrained catalyst, also known as a "slurry" hydroconversion process. The very small catalyst is dispersed in the reaction medium, distributed uniformly in the reactor, and entrained with the products leaving the reactor. According to this process, a mixture of plastics is treated using slurry technology based on the use of a reactor operating with an entrained catalyst, and is transformed into hydrocarbons having a boiling point ranging from 65°C to 175°C, corresponding to a naphtha cut.Ultimately, it is a process for chemically recycling plastic waste, making it possible to transform used plastics into a naphtha fraction, which is one of the main reactants for the production of plastics. The feedstock in the slurry hydroconversion process according to application W02020129020 is a solid mixture of polymers, which can be mixed with a residue under vacuum, and which is introduced in the form of slurry (suspension of solids) into a reactor operating in an entrained bed.Although slurry processes are known to handle heavy feedstocks and achieve higher conversion rates than other processes, for example hydroconversion processes using ebullated bed reactors using a supported catalyst maintained in the reactor, a major drawback of slurry processes lies in the complex and costly management of the catalyst entrained with the conversion products, in particular its separation from the final products as well as the entrainment of inorganic contaminants with the liquid products. More generally, the liquefaction of plastic waste by thermal cracking or acid catalytic cracking to produce fuels has been the subject of laboratory studies since the 1990s.

[0014] The concatenated review by Munir et al. 2018, (Munir et al., Renewable and Sustainable Energy Reviews 90, 2018, 490-515) summarizes the prior art in hydrocracking of plastics by direct liquefaction in the absence of co-feed.

[0015] Among the studies listed in the review, some have shown the potential of using sulfur in promoting the conversion of plastics.

[0016] Thus, Nakamura and Fujimoto (Development of new disposable catalyst for waste plastics treatment for high quality transportation fuel. Catalysis Today 27, 1996, p.175-179) studied the conversion of polypropylene (PP) in an autoclave reactor between 380°C and 400°C, under an initial hydrogen pressure of 3 MPa, in the presence or absence of iron-based catalysts supported on activated carbon or amorphous silica-alumina and in the presence of carbon disulfide (CS2). The authors observed that, with or without catalyst, the presence of CS2 increases the yield of liquid products and reduces the yield of solid residue.The authors conclude that sulfur in the reactor is a promoter for the conversion of PP, and propose an explanatory mechanism according to which hydrocarbon radicals would be formed by thermal cracking of the CC bonds of the polymer; a majority of these radicals would recombine with each other in the absence of H2S, whereas in the presence of H2S, the latter could diffuse into the polymer structure, a hydrogen atom of H2S being able to be captured by a hydrocarbon radical so as to form a stable hydrocarbon and radical HS”. The lifetime of the hydrocarbon radical would thus be reduced and its recombination prevented, as well as its potential to continue the thermal cracking which generally leads to unfavorable gas yields. Thermal cracking therefore makes it possible to transform enormous polymer molecules into long molecules which would not be too cracked thanks to the stabilization of the radicals by H2S.These long molecules can then undergo selective catalytic cracking.

[0017] Shiro et al. (Shiro et al., Energy & Fuels 16, 5, 2002, 1314-1320) studied the decomposition of low-density polyethylene (LDPE) in an autoclave reactor between 300°C and 425°C under an initial hydrogen pressure of 5 MPa. Sulfur compounds, such as H2S, elemental sulfur, dimethyl disulfide (DMDS of formula (CHaS ) etc. are added. The authors conclude that the addition of sulfur compounds has a promoting effect on the decomposition of LDPE.

[0018] Documents W09307105A1, US5158982 and US5159983 relate to the conversion by liquefaction of plastic waste, household waste containing plastics and used tire waste respectively. The waste is brought into contact with hydrogen in a pressurized reactor. A soluble Mo-based catalyst is optional. When the waste contains oxygenated molecules, an atmosphere of hydrogen mixed with H2S is preferred. The addition of sulfur or sulfur compounds is rather known, in hydroconversion processes, to sulfurize the catalysts, and thus make them "active". Conventionally, the catalysts are advantageously subjected to a sulfurization treatment to transform, at least in part, the metallic species into sulfurized form before being brought into contact with the feedstock to be treated. This sulfurization activation treatment is well known to those skilled in the art.

[0019] The formation of the active phase of the catalyst by sulfurization can be done in situ, i.e. in the hydroconversion process after loading the catalyst or catalyst precursor, typically in the reactor, for example by adding sulfur-containing organic molecules such as DMDS, thioacetamide, etc. to the hydrocarbon feedstock to be treated, under conditions of hydrogen pressure and temperature, or can be done ex-situ, i.e. before loading the catalyst at one of the stages of the hydroconversion process, under conditions suitable for activation.

[0020] Patent application CA2171803, relating to the liquefaction of plastic waste mixed with a suspending agent in a pressurized container of H2 or N2, alone or in a mixture, and optionally in the presence of a solid catalyst, describes the possibility of adding a sulfur donor agent to sulfurize metals possibly present used as catalysts, in particular iron.

[0021] The French patent applications filed by the Applicant under numbers FR 22 / 10.940 and FR 22 / 10.943 relate to processes for the hydroconversion of a 100% plastic feedstock using supported catalysts and a source of radicals comprising sulfur to promote the conversion of plastics. The sulfur radical source, which may be H2S, elemental sulfur, carbon disulfide (CS2), dimethyl sulfide (DMS), dimethyl sulfoxide (DMSO), diethyl sulfide DES, dimethyl disulfide (DMDS of formula (CHaS ), mercaptans or polysulfides, is introduced so that the elemental sulfur content is between 3% and 20% by weight relative to the weight of the feedstock.

[0022] The French patent application filed by the Applicant under number FR 21 / 14.037 relates to a process for the hydroconversion of a mixed feedstock comprising a heavy hydrocarbon fraction and a plastic fraction, comprising at least one hydroconversion step using one or more reactors operating in an ebullated bed or in a hybrid ebullated-entrained bed, and pursuing in particular a general objective similar to that of the present invention, which is to produce higher quality materials, with a lower boiling point, for example for the purposes of fuel production, while allowing the recovery of plastic waste. This application describes different methods of conditioning and introducing the feedstock into the hydroconversion section.The patent application also describes the possibility of forming and activating in situ a colloidal or molecular catalyst, which is an extremely small (e.g., less than 1 μm) dispersed catalyst (also called entrained catalyst or slurry), by the interaction of sulfur with a soluble catalyst precursor, generally at high temperature, and thus forming the metal sulfide catalyst. A source of sulfur can be KH2S dissolved in the fossil hydrocarbon feedstock, or HzS contained in hydrogen recycled to the hydroconversion reactor, or originating from sulfur-containing organic molecules introduced into the fossil hydrocarbon fraction of the feedstock to be treated (e.g., DMDS or thioacetamide).

[0023] The present invention proposes to improve such a method, and to further improve the charge conversion performance.

[0024] Objectives and Summary of the Invention

[0025] The present invention relates to the field of the recovery of heavy loads that are difficult to recover, such as petroleum residues, which generally contain high levels of impurities such as metals, sulfur, nitrogen, Conradson carbon and asphaltenes, to convert them into lighter products that can be recovered as fuels, for example to produce gasoline or diesel, or raw materials for petrochemicals.

[0026] The inventors have demonstrated that, surprisingly, it is possible to incorporate a fraction of plastics from waste, in different ways, into a heavy hydrocarbon feedstock traditionally treated in an ebullated bed or hybrid ebullated-entrained bed hydroconversion process, without significantly deteriorating the overall conversion of the feedstock, while improving the conversion of the plastics fraction by synergy with a controlled addition of I-^S used during the hydroconversion.

[0027] The present invention thus proposes a process for hydroconversion of a heavy hydrocarbon feedstock in an ebullated or hybrid ebullated-entrained bed, said feedstock including a fraction of plastics from waste, thus enabling the production of fuel bases and other recoverable hydrocarbons (light hydrocarbons, distillates for a steam cracker, in particular for the production of recycled polyolefins, bases for the production of bitumens, lubricants, etc.) while ensuring the recovery of plastic waste which could otherwise be destined for landfill or incineration. More generally, the invention contributes to increasing the recycling share of plastic waste while treating the impurities in the plastics.

[0028] Thus, to achieve at least one of the above-mentioned objectives, among others, the present invention proposes a process for hydroconversion of a feedstock comprising the following successive steps:

[0029] (a) conditioning and introducing said feed into a first hydroconversion section (20) comprising at least one first ebullated bed or ebullated-entrained hybrid bed hydroconversion reactor comprising a first porous supported hydroconversion catalyst, said feed comprising a minor portion of a plastic fraction and a major portion of a heavy hydrocarbon fraction containing a portion of at least 50% by weight having a boiling point of at least 300°C, and containing sulfur and nitrogen; (b) a first step of hydroconversion of said feed in the presence of hydrogen and H2S in said first hydroconversion section (20) to obtain a first hydroconverted effluent (105);

[0030] (c) optionally a step of separating part or all of said first effluent resulting from step (b), to form at least one heavy cut boiling mainly at a temperature greater than or equal to 350°C;

[0031] (d) optionally a second hydroconversion step in a second hydroconversion section comprising at least one second ebullated bed or ebullated-entrained hybrid bed hydroconversion reactor of part or all of said first effluent resulting from step (b) or optionally of said heavy cut from step (c), said second hydroconversion reactor comprising a second porous supported catalyst and operating in the presence of hydrogen and H2S, to produce a second hydroconverted effluent; wherein step (b) and optional step (d) are carried out at an absolute pressure of between 5 MPa and 28 MPa, at a temperature of between 350°C and 480°C, at an hourly space velocity relative to the volume of each hydroconversion reactor of between 0.05 h 1 and 10 a.m. 1 , and with a quantity of hydrogen between 50 Nm 3 / m 3 and 5000 Nm 3 / m 3, and in which the H2S is used in step (b), and optionally step (d), for the conversion of the plastic fraction of the feedstock, and is contained in a stream of recycled hydrogen from the hydroconversion process and recycled in step (a) and / or (b), and optionally in step (d), the H2S content being between 2% and 70% by mass relative to the plastic fraction of said feedstock;

[0032] (e) a step of fractionating all or part of said first hydroconverted effluent from step (b) or said second hydroconverted effluent from step (d), in a fractionation section (30), to produce at least one heavy liquid product (106b) which boils predominantly at a temperature greater than or equal to 350°C, said heavy liquid product containing a residual fraction which boils at a temperature greater than or equal to 540°C.

[0033] According to one or more implementations of the invention, the H2S content is between 3% and 60% by mass, preferably between 3% and 25% by mass, relative to the plastic fraction of said filler.

[0034] According to one or more implementations of the invention, the mass ratio between the H2S and the H2 of said recycled hydrogen stream is between 0.001% and 20%, preferably between 0.01% and 15%, preferably between 0.1% and 10%.

[0035] According to one or more implementations of the invention, the fractionation step (e) and / or the optional separation step (c) comprises a gas / liquid separation producing at least one gas stream comprising hydrogen and H2S sent to a hydrogen treatment and recycling step (g), and the H2S content of said recycled hydrogen stream is controlled in step (g) by adding H2S or by removing HzS from said gas stream comprising hydrogen and HzS to produce said recycled hydrogen stream containing I-S.

[0036] According to one or more implementations of the invention, in step (a), the plastic fraction and the heavy hydrocarbon fraction of the feedstock are introduced mixed into said at least one first hydroconversion reactor of the first hydroconversion section.

[0037] According to one or more implementations of the invention, in step (a), the plastic fraction in the form of solid particles, optionally previously mixed with a diluent, is mixed with the heavy hydrocarbon fraction so as to form a suspension, said suspension being heated to a temperature above the melting temperature of said plastic fraction to form the feedstock introduced into the first hydroconversion reactor.

[0038] According to one or more implementations of the invention, in step (a), the plastic fraction and the heavy hydrocarbon fraction of the feedstock are introduced separately into said at least one first hydroconversion reactor of the first hydroconversion section.

[0039] According to one or more implementations of the invention, the filler comprises between 1% and 49% by weight of said plastic fraction and between 51% and 99% by weight of said heavy hydrocarbon fraction.

[0040] According to one or more implementations of the invention, the filler comprises between 1% and 45% by weight of said plastic fraction and between 55% and 99% by weight of said heavy hydrocarbon fraction.

[0041] According to one or more implementations of the invention, the filler comprises between 1% and 30% by weight, preferably between 2% and 25% by weight, of said plastic fraction, and comprises between 70% and 99% by weight, preferably between 75% and 98% by weight, of said heavy hydrocarbon fraction.

[0042] According to one or more implementations of the invention, the hydroconversion reactor(s) of the first hydroconversion section in step (b), and optionally in hydroconversion step (d), are bubbling-entrained hybrid bed reactors, said method further comprising a step of introducing a catalyst precursor, preferably molybdenum 2-ethylhexanoate, before injecting said feedstock into said at least one first bubbling-entrained hybrid bed reactor of the first hydroconversion section, such that a colloidal or molecular catalyst, preferably comprising molybdenum disulfide, is formed when the catalyst precursor reacts with sulfur.

[0043] According to one or more implementations of the invention, the first hydroconversion catalyst, and optionally the second hydroconversion catalyst, contains at least one non-noble group VIII metal chosen from nickel and cobalt, preferably nickel, and at least one group VIB metal chosen from molybdenum and tungsten, preferably molybdenum, and comprising an amorphous support, preferably alumina. According to one or more implementations of the invention, the heavy hydrocarbon fraction comprises, and may consist of, at least one of the following feedstocks, alone or as a mixture: a crude oil, a topped crude oil, an atmospheric residue or a vacuum residue from the atmospheric or vacuum distillation of a crude oil,an atmospheric residue or a vacuum residue from the atmospheric or vacuum distillation of an effluent from a thermal conversion or hydrotreatment or hydrocracking or hydroconversion unit or a direct coal liquefaction unit or a direct lignocellulosic biomass liquefaction unit, a vacuum distillate obtained directly from a crude oil or a cut from a fluid catalytic cracking unit or a hydrocracking unit or a hydroconversion unit or a coking unit or a visbreaking unit, a vacuum distillate from the direct liquefaction of coal, aromatic cuts extracted from a lubricant production unit, a deasphalted oil or an asphalt from a deasphalting unit, and preferably is a vacuum residue from the vacuum distillation of a crude oil.,

[0044] According to one or more implementations of the invention, the plastic fraction of the filler comprises at least 50% by weight, preferably at least 80% by weight, more preferably at least 90% by weight, and very preferably at least 94% by weight, of polyolefins relative to the total weight of the plastic fraction, said polyolefins preferably being chosen from the list consisting of polyethylene, polypropylene, copolymers of ethylene and propylene.

[0045] According to one or more implementations of the invention, in step (a), the plastic fraction in the form of solid particles is previously mixed with a diluent to form a first suspension, then said first suspension is mixed with the heavy hydrocarbon fraction so as to form a second suspension, said second suspension being heated to a temperature above the melting temperature of said plastic fraction to form the feedstock introduced into the first hydroconversion reactor.

[0046] According to one or more implementations of the invention, in step (a), the plastic fraction in the form of solid particles, preferably previously mixed with a diluent to form a suspension, is heated to a temperature above the melting temperature of said plastic fraction to form a molten plastic fraction, then said molten plastic fraction is mixed with the heavy hydrocarbon fraction so as to form the feedstock introduced into the first hydroconversion reactor.

[0047] According to one or more implementations of the invention, in step (a), the plastic fraction in the form of solid particles is heated to a temperature above the melting temperature of said plastic fraction to form a molten plastic fraction, then said molten plastic fraction is mixed with a diluent to form a dilute molten plastic fraction mixed with the heavy hydrocarbon fraction to form the feedstock introduced into the first hydroconversion reactor.According to one or more implementations of the invention, in step (a), the plastic fraction in the form of solid particles is sent into an extruder, optionally with a diluent, in which it is gradually heated to a temperature above the melting temperature of said plastic fraction, and put under pressure in said first hydroconversion reactor during conveying, preferably for a period of less than 15 minutes, and said extruded plastic fraction is introduced into the first hydroconversion reactor.

[0048] According to one or more implementations of the invention, in step (a), the plastic fraction in the form of solid particles is mixed with a diluent in a mixing section and heated in a heating section to a temperature above the melting temperature of said plastic fraction, preferably between 60°C and 295°C, before its introduction into the first hydroconversion reactor, the heating step being able to be carried out before or after mixing with the diluent, and preferably after mixing with the diluent.

[0049] According to one or more implementations of the invention, in step (a), the plastic fraction in the form of solid particles is first sent to a mixer to be mixed with a diluent and form a suspension, preferably at a temperature greater than or equal to ambient temperature and lower than the melting temperature of said plastic fraction, and said plastic fraction in the form of a suspension is introduced into the first hydroconversion reactor.

[0050] According to one or more implementations of the invention, in step (a), the plastic fraction in the form of solid particles is previously mixed with a diluent and with the first porous supported hydroconversion catalyst in a distribution and mixing box to form a suspension, then said suspension is introduced into the first hydroconversion reactor via the means for injecting the catalyst into the first hydroconversion reactor.

[0051] According to one or more implementations of the invention, the process comprises the separation step (c) separating part, or all, of the first hydroconverted effluent () from step (b) to produce at least the heavy cut boiling mainly at a temperature greater than or equal to 350°C, and comprises the second hydroconversion step (d) of said heavy cut.

[0052] According to one or more implementations of the invention, the diluent used to dilute the plastic fraction is a hydrocarbon or a mixture of liquid hydrocarbons, and preferably the plastic diluent is a hydrocarbon oil composed of hydrocarbons of which at least 50% by weight, relative to the total weight of the hydrocarbon oil, have a boiling point of between 180°C and 540°C, preferably chosen from the list consisting of a vacuum gas oil (VGO), a decantation oil or a recycle oil such as an FCC fluidized bed catalytic cracking effluent such as a heavy recycle oil (HCO) or a light recycle oil (LCO), a pyrolysis oil from a hydrocracker, a light gas oil, an atmospheric residue, a vacuum residue, a deasphalted oil, and a resin, and more preferably the plastic diluent is an LCO, an HCO or a VGO.According to one or more implementations of the invention, the diluent used to dilute the fraction is a hydrocarbon or a mixture of liquid hydrocarbons comprising, e.g. consisting of, xylene, toluene, gasoline, or mixtures thereof.

[0053] Other objects and advantages of the invention will appear on reading the following description of particular examples of embodiments of the invention, given as non-limiting examples, the description being made with reference to the appended figures described below.

[0054] List of figures

[0055] Figures 1A to 1D illustrate the first embodiment of the hydroconversion process according to the invention, in which the heavy fraction and the plastic fraction of the feedstock are injected separately into the hydroconversion reactor, i.e. without being mixed before their introduction into the hydroconversion reactor. This first embodiment will be referred to as direct injection.

[0056] Figures 2A to 2E illustrate the second embodiment of the hydroconversion process according to the invention, in which the heavy fraction and the plastic fraction of the feedstock are mixed before their introduction into the hydroconversion reactor. This second embodiment will be referred to as indirect injection.

[0057] These figures are identical to those of the French patent application filed under number FR 21 / 14.037.

[0058] Figure 1A is a functional diagram illustrating a first variant of the first embodiment of the hydroconversion process according to the invention, according to which the plastic fraction is heated before its introduction, in a substantially liquid form, into the hydroconversion reactor.

[0059] Figure 1B is a functional diagram illustrating a second variant of the first embodiment of the hydroconversion process according to the invention, according to which the plastic fraction is mixed with a diluent and then heated to be injected in a substantially liquid form into the hydroconversion reactor.

[0060] Figure IC is a functional diagram illustrating a third variant of the first embodiment of the hydroconversion process according to the invention, according to which the plastic fraction is injected into the hydroconversion reactor in the form of a suspension.

[0061] Figure 1D is a functional diagram illustrating a fourth variant of the first embodiment of the hydroconversion process according to the invention, according to which the plastic fraction is injected into the hydroconversion reactor in the form of a suspension via the injection means of the supported catalyst. Figure 2A is a functional diagram illustrating a first variant of the second embodiment of the hydroconversion process according to the invention, according to which the plastic fraction is mixed in solid form with the heavy fraction. Figure 2B is a functional diagram illustrating a second variant of the second embodiment of the hydroconversion process according to the invention, according to which the plastic fraction is mixed in solid form with a diluent and then mixed with the heavy fraction.

[0062] Figure 2C is a functional diagram illustrating a third variant of the second embodiment of the hydroconversion process according to the invention, according to which the plastic fraction is heated so as to be in a substantially liquid form before being mixed with the heavy fraction.

[0063] Figure 2D is a functional diagram illustrating a fourth variant of the second embodiment of the hydroconversion process according to the invention, according to which the plastic fraction is mixed in solid form with a diluent and then heated so as to be in substantially liquid form before being mixed with the heavy fraction.

[0064] Figure 2E is a functional diagram illustrating a fifth variant of the second embodiment of the hydroconversion process according to the invention, according to which the plastic fraction is heated so as to be in a substantially liquid form, then mixed with a diluent before being mixed with the heavy fraction.

[0065] In the figures, the same references designate identical or similar elements. However, identical or similar elements may have different references.

[0066] Description of the embodiments

[0067] Embodiments of the method according to the invention will now be described in detail. In the following detailed description, numerous specific details are set forth in order to provide a more thorough understanding of the method. However, it will be apparent to those skilled in the art that the method can be carried out without these specific details. In other cases, well-known features have not been described in detail to avoid unnecessarily complicating the description.

[0068] Some definitions are given below for a better understanding of the invention.

[0069] In this description, the term "include" is synonymous with (means the same as) "include" and "contain", and is inclusive or open and does not exclude other elements not mentioned. It is understood that the term "include" includes the exclusive and closed term "consist".

[0070] In this description, the expression "between ... and ..." means that the limiting values ​​of the interval are included in the range of values ​​described, unless otherwise specified.

[0071] In the present invention, the different ranges of values ​​of given parameters can be used alone or in combination. For example, a preferred range of pressure values ​​can be combined with a more preferred range of temperature values, or a preferred range of values ​​of one chemical compound or element can be combined with a more preferred range of values ​​of another chemical compound or element. In the present description, a mixture of substances in the form of a suspension, also called slurry, usually corresponds to a system formed of solid particles dispersed in a liquid (liquid dispersion).More specifically, a plastic fraction of the filler in the form of a suspension corresponds to a system comprising solid plastic particles dispersed in a liquid, for example a system comprising between 1% by weight and 50% by weight of solid plastic particles dispersed in a liquid, or even between 1% by weight and 30% by weight or between 5% by weight and 20% by weight. The liquid continuous phase in which the solid plastic particles are dispersed may be a diluent and / or the heavy liquid fraction of the filler. According to the definition given, it does not include the polymer(s) of the plastic fraction which would be melted.

[0072] The term "hydroconversion" refers to a process whose primary purpose is to reduce the boiling point range of a feedstock comprising at least 50% of a heavy hydrocarbon fraction and in which a substantial portion of the feedstock is converted to products with lower boiling point ranges than the original feedstock. Hydroconversion generally involves the fragmentation of larger hydrocarbon molecules into smaller molecular fragments having a lower number of carbon atoms and a higher hydrogen to carbon ratio. The reactions involved in hydroconversion reduce the size of hydrocarbon molecules, primarily by cleavage of carbon-carbon bonds, in the presence of hydrogen to saturate the cleaved bonds and aromatic rings.The mechanism by which hydroconversion occurs typically involves the formation of hydrocarbon free radicals during fragmentation primarily by thermal cracking, followed by capping of the free radical termini or fragments with hydrogen in the presence of active catalyst sites. Of course, during a hydroconversion process, other reactions typically associated with hydrotreating may occur, such as, among others, the removal of sulfur or nitrogen from the feedstock, or the saturation of olefins, and as more broadly defined below.

[0073] The term "hydrotreating," commonly referred to as "HDT," refers to a milder operation whose primary purpose is to remove impurities such as sulfur, nitrogen, oxygen, halides, and trace metals from the feedstock, and to saturate olefins and / or stabilize hydrocarbon free radicals by reacting them with hydrogen rather than allowing them to react with themselves. The primary purpose is not to change the boiling point range of the feedstock. Thus, hydrotreatment includes in particular hydrodesulfurization reactions (commonly called "HDS"), hydrodenitrogenation reactions (commonly called "HDN") and hydrodemetalation reactions (commonly called "HDM"), accompanied by hydrogenation, hydrodeoxygenation, hydrodearomatization, hydroisomerization, hydrodealkylation, hydrocracking, hydrodeasphalting and Conradson carbon reduction reactions.Hydroprocessing is most commonly carried out using a fixed bed reactor, although other reactors can also be used for hydroprocessing, for example an ebullated bed hydroprocessing reactor.

[0074] The term "hydroconversion reactor" refers to any vessel in which the hydroconversion of a feedstock is the primary purpose, e.g., cracking the feedstock (i.e., reducing the boiling point range), in the presence of hydrogen and a hydroconversion catalyst. Hydroconversion reactors typically include at least one inlet through which the feedstock and hydrogen can be introduced and an outlet from which an upgraded material can be withdrawn. Specifically, hydroconversion reactors are also characterized by possessing sufficient thermal energy to cause the fragmentation of larger hydrocarbon molecules into smaller molecules by thermal decomposition.Examples of hydroconversion reactors include, but are not limited to, entrained bed reactors, also known as slurry reactors (three-phase reactors—liquid, gas, solid—in which the solid and liquid phases can behave as a homogeneous phase), ebullated bed reactors (three-phase fluidized reactors), moving bed reactors (three-phase reactors with downward movement of solid catalyst and upward or downward flow of liquid and gas), and fixed bed reactors (three-phase reactors with downward flow of liquid feedstock over a fixed bed of supported catalyst with hydrogen typically flowing concurrently with the liquid, but possibly countercurrently in some cases).

[0075] The terms "hybrid bed" and "hybrid bubbling bed" and "hybrid bubbling-entrained bed" for a hydroconversion reactor refer to an bubbling bed hydroconversion reactor comprising an entrained catalyst in addition to the porous supported catalyst maintained in the bubbling bed reactor. Similarly, for a hydroconversion process, these terms thus refer to a process comprising a hybrid operation of an bubbling bed and an entrained bed in at least one hydroconversion reactor. The hybrid bed is a mixed bed of two types of catalysts of necessarily different particle size and / or density, one type of catalyst - the "porous supported catalyst" - being maintained in the reactor and the other type of catalyst - the "entrained catalyst", also commonly referred to as a "slurry catalyst" - being entrained out of the reactor with the effluents (upgraded feedstock).In the present invention, the entrained catalyst is a colloidal catalyst or a molecular catalyst, as defined below.

[0076] The terms "colloidal catalyst" and "colloidally dispersed catalyst" refer to catalyst particles having a particle size that is colloidal, e.g., less than 1 μm in size (diameter), preferably less than 500 nm in size, more preferably less than 250 nm in size, or less than 100 nm in size, or less than 50 nm in size, or less than 25 nm in size, or less than 10 nm in size, or less than 5 nm in size. The term "colloidal catalyst" includes, but is not limited to, molecular or molecularly dispersed catalyst compounds.The terms "molecular catalyst" and "molecularly dispersed catalyst" refer to catalyst compounds that are essentially "dissolved" or completely dissociated from other catalyst compounds or molecules in a feedstock, non-volatile liquid fraction, bottoms fraction, residue, or other feedstock or product in which the catalyst may be found. They also refer to very small catalyst particles or sheets that contain only a few catalyst molecules joined together (e.g., 15 molecules or fewer).

[0077] The terms "porous supported catalyst", "solid supported catalyst", and "supported catalyst" refer to catalysts that are typically used in conventional ebullated bed and fixed bed hydroconversion systems, including catalysts designed primarily for hydrocracking or hydrodemetallization and catalysts designed primarily for hydroprocessing. Such catalysts typically comprise (i) a catalyst support having a large surface area and numerous interconnected channels or pores and (ii) fine particles of an active catalyst such as sulfides of cobalt, nickel, tungsten, molybdenum, or mixed sulfides of these elements (e.g., NiMo, CoMo, etc.), dispersed within the pores. Supported catalysts are commonly produced as cylindrical extrudates ("pellets") or spherical solids, although other shapes are possible.

[0078] The method according to the invention and its operation are described in more detail below, with reference to Figures 1A to 2E representing different variants of the method according to the invention.

[0079] In all the illustrated variants, certain steps of the hydroconversion process are similar. The sections of the hydroconversion plant implementing these similar steps are designated by the same reference in the figures, such as for example the hydroconversion 20, fractionation 30 and further treatment(s) 40 sections described below.

[0080] Figures 1A to 2E are identical to those in the French patent application filed under number FR 21 / 14.037, and their description in this patent application is largely or even entirely reproduced below.

[0081] The object of the invention is to propose a process for the hydroconversion of a feedstock which is a minor plastic fraction, and a major heavy hydrocarbon fraction containing a portion of at least 50% by weight having a boiling point of at least 300°C, and containing sulfur and nitrogen, or even metals, Conradson carbon and asphaltenes, comprising the following successive stages:

[0082] (a) conditioning and introducing the feed into a first hydroconversion section 20 comprising at least one first ebullated bed or hybrid bed reactor comprising a first porous supported hydroconversion catalyst; (b) a first step of hydroconversion of said feed in the presence of hydrogen and L S in said first hydroconversion section 20 to obtain a first hydroconverted effluent 105;

[0083] (c) optionally, a step of separating part or all of said first effluent resulting from step (b), to recover at least one heavy fraction boiling mainly at a temperature greater than or equal to 350°C;

[0084] (d) optionally, a second hydroconversion step in a second hydroconversion section (not shown in the figures) comprising at least a second ebullated bed or hybrid bed reactor of part or all of said first effluent resulting from step (b) or optionally of said heavy cut from step (c), said second reactor comprising a second porous supported catalyst and operating in the presence of hydrogen and L S, to produce a second hydroconverted effluent;

[0085] (e) a step of fractionating all or part of said first hydroconverted effluent 105 from step (b) or said second hydroconverted effluent from step (d), in a fractionation section (30), to produce at least one heavy product which boils predominantly at a temperature greater than or equal to 350°C, said heavy product containing a residual fraction which boils at a temperature greater than or equal to 540°C.

[0086] Step (b) and optional step (d) are carried out at an absolute pressure of between 5 MPa and 28 MPa, at a temperature of between 350°C and 480°C, at an hourly space velocity relative to the volume of each reactor of between 0.05 h 1 and 10 a.m. 1 , and with a quantity of hydrogen between 50 Nm 3 / m 3 and 5000 Nm 3 / m 3 .

[0087] According to the invention, the HzS is used in step (b), and optionally step (d), for the conversion of the plastic fraction of the feedstock, and is contained in a stream of recycled hydrogen from the hydroconversion process and recycled in step (a) and / or (b), and optionally in step (d), the H2S content being between 2% and 70% by mass relative to the plastic fraction of the feedstock.

[0088] The charge

[0089] According to a key aspect of the invention, the filler comprises a minor portion (i.e. less than 50% by weight) of a plastic fraction and a major portion (i.e. at least 50% by weight) of a heavy hydrocarbon fraction.

[0090] The plastic fraction constitutes less than 50% by weight of the filler (total weight of the filler), preferably between 1% and 49% by weight of the filler, preferably between 1% and 45% by weight of the filler, preferably between 1% and 30% by weight of the filler, more preferably between 2% and 25% by weight of the filler, and more preferably between 2.5% and 20% by weight of the filler.

[0091] The heavy hydrocarbon fraction containing a portion of at least 50% by weight having a boiling point of at least 300°C, and containing sulfur and nitrogen, or even Conradson carbon, metals, and asphaltenes, constitutes at least 50% by weight of the feedstock (total weight of the feedstock), preferably between 51% and 99% by weight of the feedstock, preferably between 55% and 99% by weight of the feedstock, preferably between 70% and 99% by weight of the feedstock, more preferably between 75% and 98% by weight of the feedstock, and even more preferably between 80% and 97.5% by weight of the feedstock.

[0092] The sum of the plastic fraction and the heavy hydrocarbon fraction is equal to 100% by weight of the feedstock to be converted, sent to the first hydroconversion stage. In other words, the feedstock to be converted consists of said plastic fraction and said heavy hydrocarbon fraction.

[0093] Plastic fraction

[0094] The plastic fraction of the feedstock of the process according to the invention comprises plastics which themselves more particularly comprise polymers. Thus, by plastic fraction is meant a solid fraction of plastics comprising one or more polymers, and which may contain other compounds, such as additives of organic or inorganic origin and / or usage impurities in particular resulting from the life cycle of plastic materials and objects, and / or resulting from the waste collection and sorting circuit. For example, usage impurities may be metallic, organic or mineral; they may be packaging residues, food residues or compostable residues (biomass).Common impurities may also include glass, wood, cardboard, paper, aluminum, iron, metals, tires, rubber, silicones, rigid polymers, thermosetting polymers, household, chemical or cosmetic products, used oils, water.

[0095] In this description, the term "plastic impurities" refers to all compounds of the plastic fraction that are not polymers and that are not capable of being converted during the hydroconversion step(s) of the process. For example, certain organic additives may be at least partly converted during the hydroconversion, in the same way as the polymers. These are therefore not considered to be plastic impurities. On the other hand, some of the inorganic additives may be eliminated during the hydroconversion, for example those containing metals, and / or sulfur, and / or nitrogen, and / or oxygen, and / or other heteroatoms (Cl, Br, etc.). They are considered to be plastic impurities.

[0096] The plastics included in the plastic fraction of the feedstock of the process according to the invention are generally production scrap and / or waste, in particular household waste, construction waste or waste from electrical and electronic equipment. Preferably, the plastic waste comes from collection and sorting channels. Plastics or plastic materials are generally polymers which are most often mixed with additives, in order to constitute, after shaping, various materials and objects (injection-molded parts, tubes, films, fibers, fabrics, mastics, coatings, etc.). The additives used in plastics can be organic compounds or inorganic compounds. These are, for example, fillers, dyes, pigments, plasticizers, property modifiers, flame retardants, etc.

[0097] The plastic fraction of the feedstock of the process according to the invention therefore comprises polymers, and in particular thermoplastics. The polymers included in the plastic fraction of the feedstock may be alkene polymers, diene polymers, vinyl polymers, styrenic polymers (e.g., polystyrene “PS”), polyesters, and / or polyamides. Preferably, the plastic fraction of the feedstock comprises one or more polymers chosen from the list consisting of alkene polymers, diene polymers, vinyl polymers and / or styrenic polymers (e.g., polystyrene “PS”). Preferably, the polymers included in the plastic feedstock are polyolefins, such as polyethylene (PE), polypropylene (PP) and / or copolymers of ethylene and propylene.

[0098] According to one or more implementations, the plastic fraction of the filler comprises at least 50% by weight, preferably at least 80% by weight, more preferably at least 90% by weight, and very preferably at least 94% by weight, of polyolefins relative to the total weight of the plastic fraction, said polyolefins preferably being chosen from the list consisting of polyethylene, polypropylene, copolymers of ethylene and propylene.

[0099] The plastic fraction of the feedstock may comprise polymer blends, in particular blends of thermoplastics and / or blends of thermoplastics and other polymers, and compounds other than these thermoplastics and polymers, in particular additives advantageously used to formulate the plastic material and generally usage impurities from the life cycle of plastic materials and objects, and / or from the waste collection and sorting circuit. The plastic fraction of the feedstock of the process according to the invention generally comprises less than 50% by weight of these additives and usage impurities, preferably less than 20% by weight, and more preferably less than 10% by weight.

[0100] Said plastic fraction of the feedstock may advantageously be pretreated upstream of the process so as to at least eliminate all or part of the so-called coarse usage impurities, i.e. usage impurities in the form of particles of a size greater than or equal to 10 mm, preferably greater than or equal to 5 mm, or even greater than or equal to 1 mm, for example usage impurities of the wood, paper, biomass, iron, aluminum, glass, etc. type, and to shape it generally in the form of particles (divided solids) so as to facilitate treatment in the process. This pretreatment may comprise one or more steps chosen from steps of separation / sorting, shredding / grinding, extrusion, washing at atmospheric pressure, drying, and any combination of these steps.This pretreatment can be carried out on a different site, for example in a waste collection and sorting center, or on the same site where the treatment method according to the invention is implemented. Preferably, this pretreatment makes it possible to reduce the content of usage impurities to less than 6% by weight. At the end of the pretreatment, the feedstock is generally stored in the form of particles, for example in the form of ground material or powder, so as to facilitate handling and transport to the process.

[0101] Heavy fraction of hydrocarbons

[0102] The heavy hydrocarbon fraction of the feedstock of the process according to the invention is a heavy hydrocarbon fraction containing a portion of at least 50% having a boiling point of at least 300°C, preferably at least 350°C, and even more preferably at least 375°C.

[0103] The heavy fraction of non-asphaltenic hydrocarbons as defined is advantageously used in liquid form.

[0104] This heavy hydrocarbon fraction of the feedstock may be crude oil, or may come from the refining of crude oil or the processing of another hydrocarbon source in a refinery.

[0105] According to one or more implementations, the heavy hydrocarbon fraction is of fossil origin.

[0106] Preferably, the heavy hydrocarbon fraction of the feedstock is a crude oil, a topped crude oil or consists of atmospheric residues and / or vacuum residues from the atmospheric and / or vacuum distillation of a crude oil.

[0107] The heavy hydrocarbon fraction of the feedstock may also consist of atmospheric and / or vacuum residues from atmospheric and / or vacuum distillation of effluents from thermal conversion, hydrotreatment, hydrocracking and / or hydroconversion units.

[0108] Preferably, the heavy hydrocarbon fraction of the feedstock consists of vacuum residues. These vacuum residues generally contain a portion of at least 50% having a boiling point of at least 450°C, and most often at least 500°C, or even at least 540°C. The vacuum residues can come directly from the crude oil, or from other refining units, such as, among others, residue hydrotreatment, residue hydrocracking, and residue visbreaking. Preferably, the vacuum residues are vacuum residues from the vacuum distillation column of the primary fractionation of the crude (called "straight run", or "SR" for short, according to English terminology).

[0109] The heavy hydrocarbon fraction of the feedstock may still consist of vacuum distillates, either directly from crude oil or from cuts from other refining units, such as, among others, cracking units, such as fluid catalytic cracking (FCC) and hydrocracking, and thermal conversion units, such as coking units or visbreaking units.

[0110] The heavy hydrocarbon fraction of the feedstock can also consist of aromatic cuts extracted from a lubricant production unit, deasphalted oils from a deasphalting unit also called DAO (raffinates from the deasphalting unit), asphalts from a deasphalting unit (residues from the deasphalting unit).

[0111] According to one or more implementations, the heavy non-asphaltenic hydrocarbon fraction of the feedstock comprises, and may consist of, a fluidized bed catalytic cracking (FCC) effluent such as a heavy cycle oil (HCO) or a light cycle oil (LCO).

[0112] The heavy hydrocarbon fraction of the feedstock may also be derived from a coal liquefaction process, for example a residual fraction from direct coal liquefaction (an atmospheric residue and / or a vacuum residue from, for example, the H-Coal™ process), a vacuum distillate from direct coal liquefaction, such as the H-Coal™ process.

[0113] According to one or more implementations, the heavy hydrocarbon fraction is derived from the direct liquefaction of lignocellulosic biomass alone or in a mixture with coal and / or a petroleum fraction, and for example comprises, or is constituted by, a residual fraction resulting from such a process.

[0114] According to one or more implementations, the heavy hydrocarbon fraction of the feedstock does not come from a direct liquefaction process of lignocellulosic biomass alone or in a mixture with coal and / or a petroleum fraction.

[0115] According to one or more implementations, the heavy fraction of non-asphaltenic hydrocarbons of the feedstock does not come from a process of direct liquefaction of lignocellulosic biomass alone or in a mixture with coal and / or a petroleum fraction.

[0116] According to one or more implementations, the heavy fraction of non-asphaltenic hydrocarbons of the feedstock is derived from a liquefaction process, preferably pyrolysis, of plastic and / or tires and / or solid recovered fuels (SRF), and preferably a VGO and / or a DAO derived from such a process. Tires are generally mainly made of rubbers for their elastic property (mixture of elastomers of crosslinked natural and synthetic rubber type, added with additives of the silica, resin, sulfur, zinc oxide, carbon black, etc. type) and textile and metal fibers for their reinforcing property.

[0117] CSR, also called "refuse derived fuel" (RDF), or "solid recovered fuel" (SRF) in English terminology, is solid non-hazardous waste prepared for energy recovery, whether it comes from household and similar waste, waste from economic activities or construction and demolition waste. CSR is generally a mixture of any combustible waste such as used tires, food by-products (fats, animal meal, etc.), viscose and wood waste, light fractions from shredders (e.g. from used vehicles, electrical and electronic equipment (WEEE), household and commercial waste, residues from the recycling of various types of waste, including certain municipal waste, plastic waste, textiles, wood among others. CSR generally contains plastic waste.The process of liquefaction of plastic and / or tires and / or CSR can be thermal pyrolysis, catalytic pyrolysis, hydropyrolysis (pyrolysis in the presence of a catalyst and hydrogen), or even hydrothermal conversion.

[0118] All these fractions can be used to constitute the heavy hydrocarbon fraction of the charge treated according to the invention, alone or in a mixture.

[0119] According to one or more implementations, the heavy hydrocarbon fraction comprises, and may consist of, at least one of the following feedstocks, alone or in a mixture: a crude oil, a topped crude oil, an atmospheric residue or a vacuum residue from the atmospheric or vacuum distillation of a crude oil, an atmospheric residue or a vacuum residue from the atmospheric or vacuum distillation of an effluent from a thermal conversion or hydrotreatment or hydrocracking or hydroconversion unit or from a direct coal liquefaction unit or from a direct lignocellulosic biomass liquefaction unit, a vacuum distillate obtained directly from a crude oil or from a cut from a fluid catalytic cracking unit or from a hydrocracking unit or from a hydroconversion unit or from a coking unit or from a visbreaking unit, a vacuum distillate from direct coal liquefaction,aromatic cuts extracted from a lubricant production unit, deasphalted oil or asphalt from a deasphalting unit.,

[0120] According to one or more implementations, the heavy hydrocarbon fraction comprises, and may consist of, at least one of the following feedstocks, alone or in a mixture: a crude oil, a topped crude oil, an atmospheric residue or a vacuum residue from the atmospheric or vacuum distillation of a crude oil (preferably from the primary fractionation of crude oil), an atmospheric residue or a vacuum residue from the atmospheric or vacuum distillation obtained during a direct coal liquefaction process, and preferably is a vacuum residue from the vacuum distillation of a crude oil (preferably from the primary fractionation of crude oil).

[0121] The heavy hydrocarbon fraction of the feedstock treated according to the invention contains impurities, such as sulfur and nitrogen. It may also contain impurities such as metals, Conradson carbon and asphaltenes, in particular C7 asphaltenes which are insoluble in heptane. The metal contents may be greater than or equal to 20 ppm by weight, preferably greater than or equal to 100 ppm by weight.

[0122] The sulfur content may be greater than or equal to 0.1% by weight, or even greater than or equal to 0.5% or 1%, and may be greater than or equal to 2% by weight. As an indication, it may typically be up to 5 to 6% by weight for heavy fractions such as vacuum residues from direct distillation of crude oil, or even up to 10% for certain residues. The nitrogen content is usually between 1 ppm and 8000 ppm by weight, more generally between 200 ppm and 8000 ppm by weight, for example between 2000 ppm and 8000 ppm by weight. The C7 asphaltene content (heptane-insoluble compounds according to ASTM D 6560, also corresponding to NF T60-115) may be at least 1% by weight and is often greater than or equal to 3% by weight.C7 asphaltenes are compounds known to inhibit the conversion of residual fractions, both through their ability to form heavy hydrocarbon residues, commonly called coke, and through their tendency to produce sediments that severely limit the operability of hydrotreatment and hydroconversion units.

[0123] The Conradson carbon content may be greater than or equal to 3% by weight, or at least 5% by weight. The Conradson carbon content is defined by ASTM D 482 and represents for those skilled in the art a well-known assessment of the amount of carbon residue produced after pyrolysis under standard conditions of temperature and pressure.

[0124] These contents are expressed as % by weight of the total weight of the heavy hydrocarbon fraction of the charge.

[0125] According to one or more implementations of the invention, the heavy hydrocarbon fraction of the feedstock comprises sulfur at a content greater than or equal to 0.5% by weight, or even greater than or equal to 1% or 2%, nitrogen at a content of between 1 ppm and 8000 ppm by weight, or even between 200 ppm and 8000 ppm by weight or between 2000 ppm and 8000 ppm by weight, and preferably a Conradson carbon content of at least 3% by weight, or even at least 5% by weight, and / or a C7 asphaltene content of at least 1% by weight, or even at least 3% by weight, and / or a metal content of at least 20 ppm by weight, or even at least 100 ppm by weight.

[0126] (a) Conditioning and injection stage of the feedstock into the first hydroconversion reactor

[0127] The method according to the invention comprises a step (a) of conditioning and introducing the feed into a first hydroconversion section 20 comprising at least one first ebullated bed or hybrid bed reactor comprising a first porous supported hydroconversion catalyst.

[0128] By conditioning the feedstock is meant its conditioning for the following step (b) of hydroconversion of the feedstock once introduced into the first hydroconversion reactor, i.e. its placing in a state and at temperature and pressure conditions suitable for hydroconversion in the first hydroconversion reactor.

[0129] The plastic fraction of the feedstock can be introduced in suspension into the first hydroconversion reactor, or in an essentially liquid form, previously mixed or not with the heavy hydrocarbon fraction of the feedstock.

[0130] By plastic fraction in a substantially liquid form is meant that at least 80% by weight of the polymer(s) of the plastic fraction are in a liquid form, preferably at least 90% by weight, more preferably at least 95% by weight, and even more preferably at least 98% by weight. By polymers of the plastic fraction in a liquid form is meant polymers which are not in a solid form, the latter being generally considered to correspond to the crystalline, semi-crystalline and amorphous states of a polymer.

[0131] The plastic fraction, in the form of solid particles or in an essentially liquid form, is preferably mixed with a diluent before its introduction into the first hydroconversion reactor, and where appropriate before its mixing with the heavy hydrocarbon fraction of the feedstock. Said diluent, which is referenced 107 in the figures and designated by the term “plastic diluent” in the present description in particular to be distinguished from the diluent of a possible entrained catalyst precursor, is formed by a hydrocarbon or a mixture of liquid hydrocarbons.

[0132] For example, plastic thinner is a hydrocarbon oil composed of hydrocarbons of which at least 50% by weight, relative to the total weight of the hydrocarbon oil, have a boiling point between 180°C and 540°C.Examples of suitable hydrocarbon diluents include, but are not limited to, vacuum gas oil known as "VGO" (which typically has a boiling range of 360°C to 524°C), decanter oil or recycle oil (which typically has a boiling range of 360°C to 550°C), for example, FCC fluidized catalytic cracking effluent such as heavy cycle oil (HCO) or light cycle oil (LCO), pyrolysis oil from a hydrocracker, light gas oil (which typically has a boiling range of 200°C to 360°C), atmospheric residues, vacuum residues (which typically have a boiling range of 524°C or higher), deasphalted oils, and resins. The plastic diluent may also comprise, e.g. be constituted by, lighter liquid hydrocarbons (typically C5+ hydrocarbons, iehydrocarbons which may have 5 or more carbon atoms per molecule), for example xylene, toluene, gasoline, mixtures thereof, etc. According to one or more embodiments, the plastic diluent is an LCO, an HCO or a VGO. The plastic diluent 107 may have a function as a solvent for the plastic fraction, in particular for the polymer(s) of the plastic fraction.

[0133] According to one or more implementations, the process exclusively uses one or more ebullated bed hydroconversion reactors for step (b) and the optional step (d), without using an entrained catalyst formed from an entrained catalyst precursor. According to this or these implementations, the process thus does not use a hybrid ebullated-entrained bed reactor.

[0134] Different implementations of step (a) are possible, which are distinguished at a first level by the way in which the feedstock is introduced into the first hydroconversion reactor:

[0135] - according to a first embodiment of the invention, called "direct injection" in the present description, the plastic fraction and the heavy hydrocarbon fraction are injected separately into the first hydroconversion reactor (i.e. without being mixed before their introduction into the hydroconversion reactor). This first embodiment makes it possible in particular to limit the risk of incompatibility of the heavy hydrocarbon and plastic fractions of the feedstock, which could cause demixing or precipitation of asphaltenes for example. According to this first embodiment, different variants can be implemented and better described below in relation to figures 1A, 1B, 1C and 1D. These variants are distinguished at a second level by the fact that the plastic fraction is introduced into the hydroconversion reactor in a mainly liquid form (figures 1A and 1B) or in the form of a slurry (figures 1C and 1D).

[0136] - according to a second embodiment of the invention, called "indirect injection" in the present description, the plastic fraction and the heavy hydrocarbon fraction are mixed before their introduction into the hydroconversion reactor. This second embodiment has the particular advantage of better dispersion / solubilization of the plastic fraction in the feedstock, and such a more homogeneous feedstock introduced into the reactor is, for example, favorable to good fluidization of the catalyst, and to the good hydrodynamic operation of the reactor in general. It can also allow the use of common equipment, such as furnaces, feedstock distributors, hydrogen mixers with the feedstock, for example of the T-shaped type ("T-mixer" according to English terminology), which can contribute to reducing investment costs.Here again, according to this second embodiment, different variants can be implemented, described below in relation to Figures 2A, 2B, 2C, 2D, and 2E. These variants are distinguished at a second level by the fact that the plastic fraction is in solid or slurry form (Figures 2A and 2B), or alternatively in essentially liquid form (Figures 2C, 2D and 2E) when it is mixed with the heavy hydrocarbon fraction.

[0137] According to the invention, the HzS used during the hydroconversion of the feedstock in step (b), and in step (d) if this second hydroconversion step is implemented, can be introduced in step (a) via a hydrogen stream originating from the hydroconversion process and recycled. Preferably, the mixing of the feedstock with the recycled hydrogen stream is carried out directly before entering the first hydroconversion reactor, for example in a T-shaped mixing device, already mentioned above, and commonly called a "T-mixer" according to English terminology, or in any other suitable device known to those skilled in the art.

[0138] Alternatively, or in addition, the recycled hydrogen stream comprising HzS may be sent directly to step (b) in the first bubbling bed or bubbling-entrained hybrid bed hydroconversion reactor of the first hydroconversion section 20, and optionally to step (d), in the second bubbling bed or bubbling-entrained hybrid bed hydroconversion reactor of the second hydroconversion section.

[0139] The recycled hydrogen stream comprising H2S is not shown in the figures. The recycled hydrogen stream comprising HzS is advantageously produced during a step (g) of treatment and recycling of hydrogen described below at the end of the descriptive part of the embodiments.

[0140] According to one or more implementations of the invention, the recycled hydrogen stream comprising HzS is introduced in step (a) during indirect injection (i.e. plastic and heavy fractions introduced as a mixture into the first hydroconversion reactor) during a step of pressurizing and / or heating the mixture formed by the heavy hydrocarbon fraction and the plastic fraction, for example by means of a hydrogen mixer with the feedstock, for example a T-shaped mixer ("T-mixer"), before introduction into the first hydroconversion reactor. In the case of indirect injection of the feedstock, the recycled hydrogen stream comprising HzS can therefore be mixed with the heavy hydrocarbon fraction, before mixing the latter with the plastic fraction, or conversely the recycled hydrogen stream comprising H2S can be mixed with the plastic fraction, before mixing the latter with the heavy fraction.According to one or more implementations of the invention, the recycled hydrogen stream comprising H2S is introduced in step (a) during direct injection (i.e. plastic and heavy fractions introduced separately into the first hydroconversion reactor) during a step of pressurizing and / or heating the heavy hydrocarbon fraction and / or during a step of pressurizing and / or heating the plastic fraction, for example by means of a hydrogen mixer with the feedstock, for example a T-shaped mixer ("T-mixer"), before the introduction of each fraction into the first hydroconversion reactor. In the case of direct injection of the feedstock, the recycled hydrogen stream comprising H2S is preferably mixed with the heavy hydrocarbon fraction before the latter is introduced into the reactor.

[0141] In the figures, the bold arrows represent a flow in which the plastic fraction is in a substantially liquid form (i.e. at least 90% by weight, preferably at least 95% by weight, and more preferably at least 98% by weight of the plastic fraction is in liquid form), and the gray rectangles represent devices in which the plastic fraction is heated so as to melt.

[0142] Direct injection fractions injected separately into the hydroconversion reactor

[0143] Step (al)

[0144] Figure 1A illustrates a first variant of the first embodiment, in which step (a) of conditioning and injecting the feedstock is a step (al) of extruding the plastic fraction and introducing said extruded plastic fraction into the first hydroconversion reactor of the first hydroconversion section 20. The plastic fraction is thus introduced into said reactor in a substantially liquid form.

[0145] The associated steps and devices other than step (a) of Figure 1A are described later in the description. Extrusion is conventionally a process that allows the injection or shaping of a polymer initially in the solid state. According to an extrusion process, the material is transported via one or more screws, kneaded and heated, which allows it to melt. And at the same time, the screw(s) convey the material and cause it to increase in pressure, which allows it to be injected into a die or into a mold.

[0146] According to this first variant of the first embodiment of the invention, the extrusion of the plastic fraction is a means of introducing the plastic fraction which is solid at room temperature into the hydroconversion reactor operating under high pressure and temperature. The extrusion therefore makes it possible to heat, in order to liquefy, and to pressurize the plastic fraction at the operating conditions of the first hydroconversion reactor as operated in step (b).

[0147] The material is not injected into a die or mold as in a conventional extrusion process, thus not constituting a shaping process, but is injected directly into the first hydroconversion reactor of the first hydroconversion section 20.

[0148] According to this first variant of the first embodiment of the invention, the plastic fraction in the form of solid particles 102 is sent into an extruder 10, possibly with a plastic diluent 107 as described above, in which it is gradually heated to a temperature higher than the melting temperature of said plastic fraction, and put under pressure in said first hydroconversion reactor during conveying, preferably for a duration of less than 15 minutes, and the plastic fraction thus extruded 103 is introduced into the first hydroconversion reactor of the first hydroconversion section 20.

[0149] During extrusion, the plastic fraction is preferably gradually heated to a temperature above its melting temperature so as to melt. Advantageously, at least 80% by weight of the plastic fraction is in liquid (molten) form at the end of the extrusion, very advantageously at least 90% by weight, preferably at least 95% by weight, or even 98% by weight. As described above, the plastic fraction generally contains compounds other than polymers, in particular plastic impurities. Some of these non-polymeric compounds, including plastic impurities, may be insoluble and / or have a higher melting point than the polymer(s) of the plastic fraction. Even if all of the polymer(s) melt, a portion of the liquid fraction, taking into account the non-polymeric compounds, may therefore remain in a solid form.This is true for all the steps described below in which heating results in the total or near liquefaction of the plastic fraction.

[0150] The extrusion temperature depends on the polymer composition of the plastic fraction (nature and proportion(s) of the polymer(s)). It may also depend on a plastic diluent 107 added to the plastic fraction during extrusion. Preferably, the extruder 10 is operated at a temperature between a temperature 25°C lower than the melting temperature of the plastic fraction and a temperature 25°C higher than the melting temperature of the plastic fraction.

[0151] In the case where the plastic fraction comprises a mixture of polymers, the extruder 10 is operated at a temperature between a temperature of 25°C lower than the melting temperature of the least refractory polymer (i.e. which has the lowest melting temperature) of the plastic fraction and a temperature of 25°C higher than the melting temperature of the most refractory polymer (i.e. which has the highest melting temperature) of the plastic fraction.

[0152] Advantageously, the plastic fraction is preferably gradually heated in the extruder 10 to a temperature higher than the melting temperature of the polymer which has the highest melting point.

[0153] As a guide, the melting temperature of polypropylene (PP) is approximately 170°C, the melting temperature of polyethylene (PE) is between approximately 85°C and 140°C, and the melting temperature of polystyrene is between approximately 240°C and 270°C.

[0154] The extrusion temperature is preferably such that thermal degradation of the polymer(s) is limited, which could lead to the formation of undesirable solids. For example, the extrusion temperature is advantageously less than 200°C, in particular in the case where the plastic fraction mainly comprises PE. It may advantageously be less than 300°C in the case where the plastic fraction mainly comprises PS.

[0155] Preferably, the extruder 10 is operated at a temperature between 60°C and 295°C, more preferably between 60°C and 195°C.

[0156] Advantageously, the extruder 10 is operated at a temperature between 60°C and 165°C, so as to melt a plastic fraction mainly comprising PE as polymer.

[0157] Advantageously, the extruder 10 is operated at a temperature between 145°C and 195°C, so as to melt a plastic fraction mainly comprising PP as polymer.

[0158] Advantageously, the extruder 10 is operated at a temperature between 215°C and 295°C, so as to melt a plastic fraction mainly comprising PS as polymer.

[0159] The operating temperature of the extruder is advantageously adapted according to the composition of the plastic fraction.

[0160] Advantageously, the extruder 10 comprises at least one screw conveying section, called the extrusion section, fed by the plastic fraction.

[0161] The residence time in this extrusion section (volume of said section divided by the volume flow rate of plastic fraction) is advantageously less than 15 minutes, preferably less than 10 minutes, and more preferably less than 2 minutes. Said extrusion section is advantageously connected to a vacuum extraction system so as to remove impurities such as dissolved gases, light organic compounds and / or moisture which may be present in the plastic fraction.

[0162] Said extrusion section may also advantageously comprise a filtration system for removing solid particles of undesirable size, for example larger than 200 μm, and preferably larger than 40 μm, such as sand particles. If a diluent is used, the viscosity may decrease, it is possible to filter particles of smaller size, for example larger than 3 μm.

[0163] The plastic fraction is advantageously brought into contact with a hydrocarbon plastic diluent 107, resulting from the hydroconversion process according to the invention or not, and preferably resulting from the hydroconversion process, within said extrusion section of the extruder 10.

[0164] Using a plastic thinner has the following advantages:

[0165] - reduce the viscosity of the plastic fraction, which in particular makes it possible to easily transport the diluted plastic fraction over greater distances;

[0166] - reduce the operating temperature of the extruder 10, and possibly limit the thermal degradation of the polymer(s) of the plastic fraction. It is for example possible to extrude, at least after the point(s) of contact with the plastic diluent 107, from a temperature lower than the temperature of 25°C lower than the melting temperature of the plastic fraction;

[0167] - initiate the dispersion of the polymer(s) of the plastic fraction in a low-viscosity phase so that it(they) mix(es) more easily with the heavy hydrocarbon fraction within the first hydroconversion reactor of the first hydroconversion section 20.

[0168] Separately from the introduction of the extruded plastic fraction, diluted or not, the heavy hydrocarbon fraction 101 is introduced into the first hydroconversion reactor, and the hydroconversion step (b) as described below is carried out.

[0169] Prior to its introduction into the first hydroconversion reactor, the heavy hydrocarbon fraction 101 may be mixed with an entrained catalyst precursor 104, such that, upon formation of the entrained catalyst, in particular by reaction with sulfur, the entrained catalyst will comprise a colloidal or molecular catalyst dispersed in the feedstock.

[0170] The entrained catalyst precursor may be selected from any metal catalyst precursor known to a person skilled in the art, capable of forming a colloidally or molecularly dispersed catalyst (i.e. the entrained catalyst) in the presence of hydrogen and / or H2S and / or any other sulfur source, and enabling the hydroconversion of the feedstock after its injection into the first hydroconversion reactor. The catalyst precursor is advantageously an oil-soluble catalyst precursor containing at least one transition metal.

[0171] The catalyst precursor preferably comprises an oil-soluble organometallic compound or complex.

[0172] The catalyst precursor may comprise an oil-soluble organometallic or bimetallic compound or complex comprising one or two of the following metals: Mo, Ni, V, Fe, Co or W, or mixtures of such compounds / complexes.

[0173] The oil-soluble catalyst precursor preferably has a decomposition temperature (temperature below which the catalyst precursor is substantially chemically stable) in a range of 100°C to 350°C, more preferably in a range of 150°C to 300°C, and most preferably in a range of 175°C to 250°C.

[0174] The oil-soluble organometallic compound or complex is preferably selected from the group consisting of molybdenum 2-ethylhexanoate, molybdenum naphthanate, vanadium naphthanate, vanadium octoate, molybdenum hexacarbonyl, vanadium hexacarbonyl, and iron pentacarbonyl. These compounds are non-limiting examples of oil-soluble catalyst precursors.

[0175] More preferably, the catalyst precursor comprises Mo and, for example, comprises a compound selected from the group consisting of molybdenum 2-ethylhexanoate, molybdenum naphthanate, and molybdenum hexacarbonyl.

[0176] A currently preferred catalyst precursor comprises, or consists of, molybdenum 2-ethylhexanoate (also commonly referred to as molybdenum octoate). Typically, molybdenum 2-ethylhexanoate contains 15% by weight of molybdenum and has a decomposition temperature or decomposition temperature range sufficiently high to avoid substantial thermal decomposition when mixed with a heavy hydrocarbon fraction at a temperature below 250°C.

[0177] One skilled in the art can select a mixing temperature profile that results in mixing of the chosen precursor without substantial thermal decomposition prior to formation of the colloidal or molecular catalyst.

[0178] The catalyst precursor 104, preferably an oil-soluble catalyst precursor, may be pre-mixed with a diluent hydrocarbon stream to form a dilute precursor mixture, as described in US2005 / 0241991, US10822553 or US10941353 and recalled below.

[0179] The catalyst precursor 104 may be premixed with a diluent to form a dilute precursor mixture, said premix preferably being carried out at a temperature below a temperature at which a substantial portion of the catalyst precursor begins to decompose, preferably between room temperature, e.g. 15°C, and 300°C, more preferably between 15°C and 200°C, even more preferably between 50°C and 200°C, even more preferably between 75°C and 150°C, and even more preferably between 75°C and 100°C, and advantageously for a period of time of 1 second to 30 minutes.

[0180] Typically, the catalyst precursor diluent may be a hydrocarbon oil composed of hydrocarbons of which at least 50% by weight, relative to the total weight of the hydrocarbon oil, have a boiling temperature between 180°C and 540°C.Examples of suitable hydrocarbon diluents for diluting the precursor include, but are not limited to, a vacuum gas oil known as "VGO" (which typically has a boiling range of 360°C to 524°C), a decanter oil or a recycle oil (which typically has a boiling range of 360°C to 550°C), for example, an FCC fluidized catalytic cracking effluent such as a heavy recycle oil (HCO) or a light recycle oil (LCO), a pyrolysis oil from a hydrocracker, a light gas oil (which typically has a boiling range of 200°C to 360°C), atmospheric residues, vacuum residues (which typically have a boiling range of greater than or equal to 524°C), deasphalted oils, and resins. The catalyst precursor diluent is preferably atmospheric residue, vacuum residue, VGO.Then, the diluted precursor may be mixed with the heavy hydrocarbon fraction 101, preferably at a temperature between room temperature, e.g. 15°C, and 300°C, and advantageously for a period of 1 second to 30 minutes, preferably 1 second to 10 minutes, and even more preferably in a range of 2 seconds to 3 minutes. In the present description, a mixing time (or residence time for the mixture) of 1 second comprises instantaneous mixing.

[0181] The mass ratio of catalyst precursor 104 to hydrocarbon oil diluent is preferably in a range of about 1:500 to about 1:1, more preferably in a range of about 1:150 to about 1:2, and even more preferably in a range of about 1:100 to about 1:5 (eg 1:100, 1:50, 1:30, or 1:10).

[0182] Without mixing with a diluent, it is best to ensure that the components are mixed for a sufficient time to completely / intimately mix the catalyst precursor into the heavy hydrocarbon fraction before the entrained catalyst is formed. However, a long mixing time, for example 24 hours, can be prohibitively expensive for some industrial operations.

[0183] Premixing the catalyst precursor 104 with a hydrocarbon diluent greatly facilitates the complete and intimate mixing of the precursor into the heavy hydrocarbon fraction, particularly in the relatively short period required for large-scale industrial operations to be economically viable. The diluted precursor is preferably combined with the heavy hydrocarbon fraction and mixed for a sufficient time and in a manner to disperse the catalyst precursor throughout the heavy fraction so that the catalyst precursor is completely / intimately mixed with the heavy hydrocarbon fraction. In order to achieve sufficient mixing prior to formation of the colloidal or molecular catalyst, the diluted precursor and the heavy fraction are more preferably mixed for a period in the range of 1 second to 10 minutes, and even more preferably in the range of 2 seconds to 3 minutes.Increasing the vigor and / or shear energy of the mixing process generally reduces the time required to achieve complete / intimate mixing.Examples of mixing apparatuses that may be used to effect complete / intimate mixing of the catalyst precursor 104 and the heavy hydrocarbon 101 include, but are not limited to, high shear mixing such as mixing created in a pump with a propeller or turbine rotor, multiple static in-line mixers, multiple static in-line mixers in combination with high shear in-line mixers, multiple static in-line mixers in combination with high shear in-line mixers, multiple static in-line mixers in combination with high shear in-line mixers followed by recirculation pumping in the surge tank, combinations of the above apparatuses followed by one or more multi-stage centrifugal pumps.

[0184] The heavy hydrocarbon fraction 101 and the diluted precursor are preferably mixed and conditioned at a temperature in a range of 50°C to 200°C, more preferably in a range of 75°C to 175°C, prior to introducing the heavy hydrocarbon fraction into the first hydroconversion reactor. Preferably, the gauge pressure is between 0 MPa and 25 MPa, more preferably between 0.01 MPa and 5 MPa.

[0185] The heavy hydrocarbon fraction 101, which may contain the entrained catalyst precursor, diluted or not, may be heated in at least one preheater before being introduced into the hydroconversion reactor. This preheating may help to achieve a target temperature in the first hydroconversion reactor in the subsequent step (b). The preheating is preferably carried out at a temperature between 280°C and 450°C, even more preferably between 300°C and 400°C, and even more preferably between 320°C and 365°C. This preheating may be carried out at a temperature which is 100°C lower, preferably 50°C lower, than the hydroconversion temperature in the hydroconversion reactor. The absolute pressure during this preheating can be between atmospheric pressure (eg 0.101325 MPa) and 38 MPa, preferably between 5 MPa and 25 MPa, and preferably between 6 MPa and 20 MPa.Preheating advantageously causes a release of sulfur contained in the heavy hydrocarbon fraction which can combine with the metal of the catalyst precursor. The colloidal or molecular catalyst can form, or at least begin to form, in situ in the heavy hydrocarbon fraction during this preheating step. In order to form the colloidal or molecular catalyst, sulfur must be available (e.g. as H2S) to combine with the metal of the dispersed catalyst precursor composition. The entrained catalyst can also form in step (b) of hydroconversion.

[0186] In the case where the heavy hydrocarbon fraction comprises sulfur in sufficient quantity or in excess, the final activated catalyst can be formed in situ by heating said heavy fraction to a temperature sufficient to release the sulfur therefrom. A source of sulfur can thus be HzS dissolved in the heavy hydrocarbon fraction, or HzS contained in hydrogen recycled to the hydroconversion reactor, or HzS originating from sulfur-containing organic molecules present in the heavy hydrocarbon fraction or possibly previously introduced into said heavy fraction (e.g. injection of dimethyl disulfide, thioacetamide, any hydrocarbon feedstock containing sulfur of the mercaptan type, sulfides, petroleum containing sulfur, diesel containing sulfur, vacuum distillate containing sulfur, residue containing sulfur).

[0187] Thus, a source of sulfur may be sulfur compounds in the heavy fraction of hydrocarbons or a sulfur compound added to said heavy fraction.

[0188] According to one or more implementations of the invention, if the recycled hydrogen stream comprising the H2S used in the hydroconversion is recycled to step a) during such a preheating step, or upstream thereof, the H2S of the recycled hydrogen stream is present in a content significantly higher than that which would be necessary to form the entrained catalyst from the entrained catalyst precursor, the latter preferably being used in small quantities. In accordance with the invention, the gaseous H2S of the recycled hydrogen stream must in fact be used in the first hydroconversion reactor in the hydroconversion step (b) to convert the plastic fraction of the feedstock (and possibly in the 2 ème hydroconversion reactor at optional stage (d)).

[0189] The temperature during preheating of the heavy hydrocarbon fraction and / or in step (b) allows the formation of the metal sulfide catalyst.

[0190] The metal concentration of the catalyst, preferably Mo, in the feedstock (i.e. the combined heavy hydrocarbon fraction and plastic fraction) is preferably between 5 ppm and 500 ppm by weight of the feedstock, more preferably between 10 ppm and 300 ppm by weight, more preferably between 10 ppm and 175 ppm by weight, even more preferably between 10 ppm and 75 ppm by weight, and even more preferably between 10 ppm and 50 ppm by weight.

[0191] Preferably, the colloidal or molecular catalyst comprises molybdenum disulfide.

[0192] Step (a2)

[0193] Alternatively, in step (a) the plastic fraction in the form of solid particles may be mixed with a plastic diluent in a mixing section and heated in a heating section so as to obtain an essentially liquid plastic fraction (e.g. at a temperature above the melting temperature of said plastic fraction, preferably between 60°C and 295°C), before its introduction into the first hydroconversion reactor, the heating step being able to be carried out before or after mixing with the plastic diluent, and preferably after mixing with the plastic diluent.

[0194] Thus, step (a) may be a step (a2) of direct injection of the plastic fraction in an essentially liquid form after said plastic fraction has been mixed with a plastic diluent 107 to form a slurry then heated so as to obtain an essentially liquid plastic fraction. Figure 1B illustrates this second variant of the first embodiment of the method according to the invention. This variant has the particular advantage of using simple and inexpensive equipment.The plastic fraction in the form of solid particles 102 is premixed with a plastic diluent 107 in a mixing section 11 to form a suspension 108, then said suspension 108 is sent to a heating section 12 to be heated to a temperature higher than the melting temperature of said plastic fraction, so that the solid particles of the suspended plastic fraction melt, and said heated plastic fraction 109 is introduced into the first hydroconversion reactor of the first hydroconversion section 20. The mixing of the plastic diluent 107 and the plastic fraction in the form of particles 102 in the mixing section 11 is preferably carried out at atmospheric pressure or a pressure close to atmospheric pressure. Preferably, during the mixing step in the mixing section 11, the temperature is such that the suspension 108 has a kinematic viscosity of less than 0.3.10.-3 m 2 / s, corresponding to the viscosity of a pumpable fluid. The temperature at this stage is preferably lower than the temperature operated at the heating stage described below, in the case where the mixing stages are separate and precede the heating stage.

[0195] The mixing section 11 may comprise a mixing tank having dynamic stirring means for suspension, for example an agitator and / or a recirculation pump.

[0196] At the end of heating the suspension 108, at least 90% by weight of the heated plastic fraction 109 is advantageously in liquid form, very advantageously at least 95% by weight, preferably at least 98% by weight.

[0197] What has been described for the temperature conditions of the extruder 10 in step (al) applies for the heating of the suspension in step (a2), and is therefore not repeated here.

[0198] It is however again specified that the heating temperature may also depend on the plastic diluent 107 used, such a plastic diluent being able in particular, depending on its nature, to allow the suspended plastic fraction to melt at a lower temperature.

[0199] The heating section 12 comprises any heating means known to a person skilled in the art capable of heating a suspended plastic fraction 108. The heating section 12 may comprise a furnace comprising at least one heating compartment, and / or tubes in which the suspension 108 flows, any type of suitable heat exchanger, etc.

[0200] According to one configuration, the mixing section 11 and the heating section 12 may be part of the same device configured to consecutively implement the mixing and then the heating of step (a2).

[0201] Before its introduction into the first hydroconversion reactor, the heated plastic fraction 109 preferably undergoes a pressurization step to be adapted to the pressure operated in the first hydroconversion reactor, for example using a suitable pump. It may also be subjected to a filtration step aimed, for example, at removing solid particles from the plastic fraction which may be part of the plastic impurities, such as sand, glass, metals, certain additives called “fillers” according to English terminology, etc.

[0202] Separately to the introduction of the heated plastic fraction 109, the heavy hydrocarbon fraction 101 is introduced into the first hydroconversion reactor of the first hydroconversion section 20, and the hydroconversion step (b) as described later is carried out.

[0203] Prior to its introduction into the first hydroconversion reactor, the heavy hydrocarbon fraction 101 may be mixed with an entrained catalyst precursor 104, such that, upon formation of the entrained catalyst, in particular by reaction with sulfur, the entrained catalyst will comprise a colloidal or molecular catalyst dispersed in the feedstock. What has been described on this subject in step (a1) applies here in the same manner and is not repeated.

[0204] According to another variant of the first embodiment of the method according to the invention not shown, step (a) may be a step (a'2) of direct injection of the plastic fraction in an essentially liquid form after said plastic fraction has been heated so as to obtain an essentially liquid plastic fraction, then mixed with a plastic diluent 107 to form a diluted plastic fraction introduced into the first hydroconversion reactor.

[0205] According to yet another variant, the mixing step and the heating step are carried out simultaneously, the mixing and heating sections then being part of the same device configured to carry out the mixing and heating simultaneously.

[0206] Step (a3)

[0207] Alternatively, step (a) may be a step (a3) ​​of direct injection of the suspended plastic fraction into the first hydroconversion reactor.

[0208] Figure IC illustrates this third variant of the first embodiment of the method according to the invention. This variant has the particular advantage of using simple and inexpensive equipment. According to step (a3), the plastic fraction in the form of solid particles 102 is first sent to a mixer 13 to be mixed with a plastic diluent 107 and form a suspension 110, then said plastic fraction in the form of suspension 110 is introduced into the first hydroconversion reactor of the first hydroconversion section 20.

[0209] The mixing of the plastic diluent 107 and the plastic fraction 102 in the mixer is preferably carried out at a temperature greater than or equal to room temperature, e.g. 15°C, and lower than the melting temperature of said plastic fraction (or lower than the melting temperature of the polymer which has the lowest melting point if said plastic fraction comprises a mixture of polymers). A temperature slightly lower than the melting temperature of the plastic fraction may constitute the upper limit for the temperature of the mixture, since the plastic diluent 107 used, depending on its nature, has an influence on the temperature at which the plastic fraction can be dissolved (in the case where the plastic diluent has a solvent function).

[0210] According to one configuration, the mixing can be carried out at a temperature greater than or equal to 50°C or even 75°C and less than 170°C, a temperature particularly well suited to the use of a VGO as a plastic diluent and to a plastic fraction mainly comprising PP as a polymer, or at a temperature greater than or equal to 150°C and less than 170°C, a temperature particularly well suited to the use of a vacuum residue as a plastic diluent and to a plastic fraction mainly comprising PP as a polymer.

[0211] According to one configuration, the mixture can be carried out at a temperature greater than or equal to 50°C or even 75°C and less than 140°C, or carried out at a temperature greater than or equal to 50°C or even 75°C and less than 85°C, for example well suited to the use of a VGO as a plastic diluent and a plastic fraction mainly comprising PE as a polymer.

[0212] According to one configuration, the mixture can be carried out at a temperature greater than or equal to 50°C or even 75°C and less than 270°C, or else carried out at a temperature greater than or equal to 50°C or even 75°C and less than 240°C, a temperature particularly well suited to the use of a VGO as a plastic diluent and to a plastic fraction mainly comprising PS as a polymer, or else at a temperature greater than or equal to 150°C and less than 270°C, or even less than 240°C, a temperature particularly well suited to the use of a vacuum residue as a plastic diluent and to a plastic fraction mainly comprising PS as a polymer.

[0213] Mixing may or may not be active. Examples of active mixing devices that may be used include, but are not limited to, high shear mixing such as mixing created in a pump with a propeller or turbine rotor, multiple static in-line mixers, multiple static in-line mixers in combination with high shear in-line mixers, multiple static in-line mixers in combination with high shear in-line mixers, multiple static in-line mixers in combination with high shear in-line mixers followed by recirculation pumping into the surge tank, combinations of the above devices followed by one or more multi-stage centrifugal pumps.Separately from the introduction of the suspended plastic fraction 110, the heavy hydrocarbon fraction 101 is introduced into the first hydroconversion reactor of the first hydroconversion section 20, and the hydroconversion step (b) as described later is carried out.

[0214] Prior to its introduction into the first hydroconversion reactor, the heavy hydrocarbon fraction 101 may be mixed with an entrained catalyst precursor 104, such that, upon formation of the entrained catalyst, in particular by reaction with sulfur, the entrained catalyst will comprise a colloidal or molecular catalyst dispersed in the feedstock. What has been described on this subject in step (a1) applies here in the same manner and is not repeated.

[0215] Before their introduction into the first hydroconversion reactor, the suspended plastic fraction 110 and the heavy hydrocarbon fraction 101 may undergo a pressurization step to be adapted to the pressure operated in the first hydroconversion reactor.

[0216] Step (a4)

[0217] Alternatively, step (a) may be a step (a4) of direct injection of the plastic fraction into the hydroconversion reactor in the form of a suspension via the means of injecting the porous supported hydroconversion catalyst into said hydroconversion reactor.

[0218] Figure 1D illustrates this fourth variant of the first embodiment of the method according to the invention. This variant has the particular advantage of using existing means of injecting particles (the supported catalyst) into the reactor to inject the plastic fraction of the feedstock.

[0219] According to step (a4), the plastic fraction in the form of solid particles 102 is previously mixed with a plastic diluent 107 and with the first porous supported hydroconversion catalyst in a distribution and mixing box 14 to form a suspension 112, then said suspension 112 is introduced into the first hydroconversion reactor of the first hydroconversion section 20 via means for injecting the catalyst into said reactor.

[0220] The distribution and mixing box 14 is part of a device for withdrawing and injecting porous supported catalyst into the first hydroconversion reactor.

[0221] Preferably, the plastic fraction in the form of solid particles 102 is sent into the distribution and mixing box 14 intermittently.

[0222] The first hydroconversion reactor, like each ebullated bed or hybrid hydroconversion reactor used in the process according to the invention, comprises means for injecting and withdrawing the catalyst supported in said reactor.

[0223] Indeed, a key aspect of the operation of ebullated or hybrid bed reactors is the continuous replacement of the supported catalyst. Catalyst replacement is generally required in all hydrocarbon hydroconversion processes, as the supported catalyst is deactivated mainly by deposition of metals contained in the feedstock, e.g. in the form of vanadium sulfide and nickel sulfide, and by coke deposition. Ebullated bed technology, while it ultimately allows for an increase in the time between two shutdowns of the conversion process through continuous renewal of the catalyst, compared to other technologies such as fixed bed technologies, requires the implementation of a continuous catalyst renewal system, with catalyst withdrawal and top-up, for example daily. The spent catalyst, withdrawn from the reactor, can be sent to a regeneration zone in which the carbon and sulfur it contains are eliminated.It is also possible to send the spent catalyst withdrawn from the reactor to a rejuvenation zone in which most of the deposited metals are removed, before sending the spent and rejuvenated catalyst to a regeneration zone in which the carbon and sulfur it contains are removed. The regenerated or rejuvenated catalyst can then be reintroduced into the reactor, possibly in association with fresh catalyst, by the catalyst injection means.

[0224] Typically, the means for injecting and withdrawing the supported catalyst comprise at least one conduit opening into the expansion zone of the supported catalyst of the reactor for the introduction of the fresh (and / or regenerated and / or rejuvenated) supported catalyst into the expansion zone of the supported catalyst of the reactor and the withdrawal of spent catalyst from said zone. The introduction and withdrawal can be carried out with the same conduit, or by means of separate conduits, then requiring at least two conduits, an injection conduit for the injection of supported catalyst into the reactor and a conduit for the withdrawal of spent catalyst.

[0225] According to step (a3), the suspension 112, formed by mixing the plastic fraction in the form of particles 102, the supported catalyst 111 and the plastic diluent 107 in the distribution and mixing box 14, is injected into the reactor via the means for injecting the supported catalyst, in particular via a conduit connected at one end to said distribution and mixing box 14 and opening at its other end into the expansion zone of the supported catalyst of the first hydroconversion reactor. Said conduit may comprise means for controlling the circulation of the injected suspension, for example valves and / or other elements such as pumps, storage tanks, etc. The means for injecting the supported catalyst into the first hydroconversion reactor are therefore also means for injecting the plastic fraction in suspension into said first reactor.

[0226] Separately from the introduction of the suspension 112 comprising the plastic fraction and the first supported hydroconversion catalyst, the heavy hydrocarbon fraction 101 is introduced into the first hydroconversion reactor of the first hydroconversion section 20, and the hydroconversion step (b) as described later is carried out.

[0227] Prior to its introduction into the first hydroconversion reactor, the heavy hydrocarbon fraction 101 may be mixed with an entrained catalyst precursor 104, such that, upon formation of the entrained catalyst, in particular by reaction with sulfur, the entrained catalyst will comprise a colloidal or molecular catalyst dispersed in the feedstock. What has been described on this subject in step (a1) applies here in the same manner and is not repeated.

[0228] Indirect injection of mixed fractions before injections into the hydroconversion reactor

[0229] According to a second embodiment of the invention, alternative to the first embodiment, in step (a), the plastic fraction and the heavy hydrocarbon fraction of the feedstock (114, 117, 120, 122, 125) are introduced mixed into said at least one first hydroconversion reactor of the first hydroconversion section 20. Different variants can be implemented, according to the alternative steps (a5) to (a9) described below in relation to FIGS. 2A to 2E.

[0230] These variants are distinguished at a second level by the fact that the plastic fraction is in solid or slurry form (Figures 2A and 2B), or alternatively in mainly liquid form (Figures 2C, 2D and 2E) when mixed with the heavy hydrocarbon fraction.

[0231] Step (a5)

[0232] Figure 2A illustrates a first variant of the second embodiment, in which step (a) of conditioning and injecting the feedstock is a step (aS) in which the plastic fraction is mixed in solid form with the heavy fraction. Said mixture then forms a suspension, and constitutes the feedstock, which is heated so as to obtain an essentially liquid plastic fraction before the feedstock is introduced into the first hydroconversion reactor of the first hydroconversion section 20.

[0233] This variant has the particular advantage of injecting into the first hydroconversion reactor a mixture comprising a plastic fraction already dispersed in the feed, of allowing good suspension of the plastic fraction thanks to the use of the heavy hydrocarbon fraction for suspension, and of increasing the speed of solubilization of the plastic fraction where appropriate.

[0234] According to step (a5), the plastic fraction in the form of solid particles 102 is first mixed with the heavy hydrocarbon fraction 101 in a mixing device 15, forming a suspension 113.

[0235] Said mixing in the mixing device 15 is preferably carried out at a temperature greater than or equal to ambient temperature, e.g. 15°C, and lower than the melting temperature of said plastic fraction (or lower than the melting temperature of the polymer which has the lowest melting point if said plastic fraction comprises a mixture of polymers).

[0236] Advantageously, the mixture can be carried out at a temperature greater than or equal to 50°C or even 75°C, or even greater than or equal to 150°C, and less than 170°C, or even at a temperature greater than or equal to 150°C and less than 170°C, which are well suited to the use of a plastic fraction mainly comprising PP as a polymer.

[0237] Advantageously, the mixture can be carried out at a temperature greater than or equal to 50°C or even 75°C and less than 140°C, or carried out at a temperature greater than or equal to 50°C or even 75°C and less than 85°C, temperatures well suited to the use of a plastic fraction mainly comprising PE as a polymer.

[0238] According to one configuration, the mixture can be carried out at a temperature greater than or equal to 50°C or even 75°C, or even greater than or equal to 150°C and less than 270°C, or even less than 240°C, temperatures well suited to the use of a plastic fraction mainly comprising PS as a polymer.

[0239] The mixing may or may not be active. The same examples of active mixing apparatus, without limitation, which may be used are those already described in connection with step (a3) ​​for mixing the plastic fraction with the plastic diluent.

[0240] Prior to its introduction into the mixing device 15, the heavy hydrocarbon fraction 101 may be mixed with an entrained catalyst precursor 104, so that, upon formation of the entrained catalyst, in particular by reaction with sulfur, the entrained catalyst will comprise a colloidal or molecular catalyst dispersed in the feedstock. What has been described on this subject in step (a1) applies here in the same manner and is not repeated.

[0241] The suspension 113 is then heated in a heating device 16, so that the solid particles of the plastic fraction melt. Said suspension 113 is thus heated to a temperature higher than the melting temperature of said plastic fraction. At the end of the heating of the suspension 113, at least 90% by weight of the plastic fraction of the filler 114 is advantageously in liquid form, very advantageously at least 95% by weight, preferably at least 98% by weight.

[0242] Preferably, the suspension 113 is heated so as to reach a target temperature in the first reactor. The heating is preferably carried out at a temperature between 280°C and 450°C, even more preferably between 300°C and 400°C, and even more preferably between 320°C and 365°C. This preheating can be carried out at a temperature which is 100°C lower, preferably 50°C lower, than the hydroconversion temperature in the hydroconversion reactor.

[0243] The heating section 16 comprises any heating means known to a person skilled in the art capable of heating a suspended plastic fraction 113. The heating section 16 may comprise a furnace comprising for example at least one heating compartment, and / or tubes in which the suspension flows, a mixer of the feedstock with H2, any type of suitable heat exchangers, for example tubular or spiral heat exchangers in which the suspension flows, etc.

[0244] According to one configuration, the mixing section 15 and the heating section 16 may be part of the same device configured to consecutively implement the mixing and then the heating of step (a5). The feedstock 114, in essentially liquid form, and comprising the plastic fraction and the heavy fraction of hydrocarbons in mixture, is then introduced into the first hydroconversion reactor of the first hydroconversion section 20, and the hydroconversion step (b) as described later is carried out.

[0245] Preferably, a pressurization step is carried out after mixing the heavy hydrocarbon fraction with the plastic fraction and before the heating section, so that the charge 114 is adapted to the pressure operated in the first hydroconversion reactor.

[0246] Step (a6)

[0247] Alternatively, step (a) may be an indirect injection step (a6), in which the plastic fraction is first mixed in solid form with a diluent before being mixed with the heavy fraction. Said final mixture then forms a suspension, and constitutes the feedstock, which is heated so as to obtain an essentially liquid plastic fraction before the feedstock is introduced into the first hydroconversion reactor of the first hydroconversion section 20.

[0248] This second variant of the second embodiment of the method according to the invention, illustrated in Figure 2B, therefore differs only from step (a5) by the premixing of the plastic fraction in the form of particles 102 with a plastic diluent 107 in a first mixer 17 producing a first suspension 115.

[0249] This variant presents in particular the advantages mentioned for step (a5), as well as better solubilization of the liquid fraction where applicable.

[0250] The operating conditions of this premix in the first mixer 17, as well as the type of mixture and associated device, are identical to those already described in relation to step (a3) ​​in relation to the mixing of the plastic fraction and the plastic diluent, and are not repeated here.

[0251] The first suspension 115 is then mixed with the heavy hydrocarbon fraction 101 in a second mixer 18 to form a second suspension 116, in the same manner as described in step (a5) above, and is not repeated here.

[0252] Prior to its introduction into the mixing device 15, the heavy hydrocarbon fraction 101 may be mixed with an entrained catalyst precursor 104, so that, upon formation of the entrained catalyst, in particular by reaction with sulfur, the entrained catalyst will comprise a colloidal or molecular catalyst dispersed in the feedstock. What has been described on this subject in step (a1) applies here in the same manner and is not repeated.

[0253] The heating of the second suspension 116 in the heating device 19 is also carried out in the same way as described in step (a5) for the heating of the suspension 113, and allows the solid particles of the plastic fraction to melt. At the end of the heating of the second suspension 116, at least 90% by weight of the plastic fraction of the feedstock is advantageously in liquid form, very advantageously at least 95% by weight, preferably at least 98% by weight. The feedstock 117, resulting from the heating of the second suspension 116 in the heating device 19, comprising the essentially liquid plastic fraction and the heavy hydrocarbon fraction in mixture, is then introduced into the first hydroconversion reactor of the first hydroconversion section 20, and the hydroconversion step (b) as described later is carried out.

[0254] Step (a7)

[0255] Alternatively, step (a) may be an indirect injection step (a7), in which the plastic fraction is heated so as to be in a substantially liquid form before being mixed with the heavy hydrocarbon fraction.

[0256] Figure 2C illustrates this third variant of the second embodiment of the method according to the invention.

[0257] This variant has the particular advantage of avoiding the management of suspending the plastic fraction and of freeing up associated mixing equipment.

[0258] According to step (a7), the plastic fraction in the form of solid particles 102 is first heated in a melting device 21 in order to melt said plastic fraction. For this, the plastic fraction is heated to a temperature higher than the melting temperature of said plastic fraction. Advantageously, at least 80% by weight of the plastic fraction is in liquid form at the end of this heating, very advantageously at least 90% by weight, preferably at least 95% by weight, or even 98% by weight.

[0259] What has been described for the temperature conditions of the extruder 10 in step (al) applies for the heating of the plastic fraction in the liquefaction device 21 in this step (a7), and is therefore not repeated here.

[0260] The melting device 21 comprises any heating means known to a person skilled in the art capable of melting a solid plastic fraction. The melting device 21 may comprise a furnace, a heated pot, etc. The melting device 21 may comprise mixing means for mixing the existing phases during melting.

[0261] The melting device may be an extruder as described in step (a1).

[0262] The molten plastic fraction 118 is then mixed with the heavy hydrocarbon fraction 101 in a mixer 22, to form a feedstock 119 then introduced into the first hydroconversion reactor of the first hydroconversion section 20, and the hydroconversion step (b) as described later is carried out. Said mixing in the mixer 22 is preferably carried out at a temperature between 85°C, or even 100°C, and 350°C, preferably between 150°C and 250°C. The temperature is advantageously adjusted according to the viscosity of the mixture.

[0263] Prior to its introduction into the mixing device 22, the heavy hydrocarbon fraction 101 may be mixed with an entrained catalyst precursor 104, so that, upon formation of the entrained catalyst, in particular by reaction with sulfur, the entrained catalyst will comprise a colloidal or molecular catalyst dispersed in the feedstock. What has been described on this subject in step (a1) applies here in the same way and is not repeated.

[0264] The entrained catalyst precursor 104 may also be mixed with the feedstock 119 from the mixer 22, before its introduction into the first hydroconversion reactor, in addition to or alternatively to mixing the precursor with the heavy hydrocarbon fraction 101. In this case, the mixing is similar to what has been described for mixing with the heavy hydrocarbon fraction 101.

[0265] Step (a8)

[0266] Alternatively, step (a) may be an indirect injection step (a8), in which the plastic fraction is pre-mixed in solid form with a plastic diluent and then heated so as to be in substantially liquid form before being mixed with the heavy hydrocarbon fraction.

[0267] This fourth variant of the second embodiment of the method according to the invention, illustrated in Figure 2D, therefore differs only from step (a7) by the premixing of the plastic fraction in the form of particles 102 with a plastic diluent 107 in a pre-mixer 17, producing a suspension 120.

[0268] This variant has the advantage of good dispersion and / or good solubilization of the plastic fraction, and provides greater flexibility for mixing with the heavy hydrocarbon fraction, particularly with regard to a targeted viscosity.

[0269] The operating conditions of this premix in the premixer 17, as well as the type of mixture and associated device, are identical to those already described in relation to step (a3) ​​and (a6) in relation to the mixing of the plastic fraction and the plastic diluent, and are not repeated here.

[0270] The suspension 120 is then heated in a heating device 23, to a temperature higher than the melting temperature of said plastic fraction, so that the solid particles of the suspended plastic fraction melt.

[0271] After heating the suspension 120, at least 90% by weight of the plastic fraction is advantageously in liquid form, very advantageously at least 95% by weight, preferably at least 98% by weight.

[0272] What has been described for the temperature conditions of the extruder 10 in step (a1) applies to the heating of the suspension 120 in step (a8), and is therefore not repeated here. It is however again specified that the heating temperature may also depend on the plastic diluent 107 used, such a diluent being able in particular, depending on its nature, to allow the plastic fraction in suspension to melt at a lower temperature.

[0273] The heating section 23 comprises any heating means known to a person skilled in the art capable of heating a suspended plastic fraction 120. The heating section 23 may comprise a furnace comprising at least one heating compartment, and / or tubes in which the suspension 120 flows, any type of suitable heat exchanger, etc.

[0274] According to one configuration, the mixing section 17 and the heating section 23 may be part of the same device configured to consecutively implement the mixing and then the heating of step (a8).

[0275] The molten diluted plastic fraction 121 is then mixed with the heavy hydrocarbon fraction 101 in a mixer 22 in a manner identical to that described in step (a7) for the mixer 22, to form a feedstock 122 then introduced into the first hydroconversion reactor of the first hydroconversion section 20, and the hydroconversion step (b) as described later is carried out.

[0276] Prior to its introduction into the mixer 22, the heavy hydrocarbon fraction 101 may be mixed with an entrained catalyst precursor 104, so that, upon formation of the entrained catalyst, in particular by reaction with sulfur, the entrained catalyst will comprise a colloidal or molecular catalyst dispersed in the feedstock. What has been described on this subject in step (a1) applies here in the same way and is not repeated.

[0277] The entrained catalyst precursor 104 may also be mixed with the feedstock 122 from the mixer 22, before its introduction into the first hydroconversion reactor, in addition to or alternatively to mixing with the heavy hydrocarbon fraction 101. In this case, the mixing will be similar to what has been described for mixing with the heavy hydrocarbon fraction 101.

[0278] The entrained catalyst precursor 104 may further be mixed with the liquid plastic fraction 121 prior to its mixing with the heavy hydrocarbon fraction in the mixer 22, in addition to or alternatively to mixing the precursor with the heavy hydrocarbon fraction 101 or with the feedstock 122. In this case, the mixing is similar to that described for mixing with the heavy hydrocarbon fraction 101.

[0279] Step (a9)

[0280] Alternatively, step (a) may be an indirect injection step (a9), in which the plastic fraction is heated so as to be in a substantially liquid form, then mixed with a diluent before being mixed with the heavy hydrocarbon fraction.

[0281] Figure 2E illustrates this fifth variant of the second embodiment of the method according to the invention. This variant has the particular advantage of good dispersion and / or good solubilization of the plastic fraction.

[0282] According to step (a9), the plastic fraction in the form of solid particles 102 is first heated in a melting device 24 in order to melt said plastic fraction, in the same manner as that described in step (a7). Thus, for this, the plastic fraction is heated to a temperature higher than the melting temperature of said plastic fraction. Advantageously, at least 80% by weight of the plastic fraction is in liquid form at the end of this heating, very advantageously at least 90% by weight, preferably at least 95% by weight, or even 98% by weight.

[0283] What has been described for the temperature conditions of the extruder 10 in step (al) applies for the heating of the plastic fraction in the melting device 24 in this step (a9), and is therefore not repeated here.

[0284] The fusion device 24 is identical to what was described in step (a7) for the fusion device 21, and is not repeated here.

[0285] The molten plastic fraction 123 is then mixed with a plastic diluent 107 in a first mixer 25, to form a diluted molten plastic fraction 124.

[0286] Said mixing in the first mixer 25 is preferably carried out at a temperature higher than the melting temperature of the plastic fraction (for example higher than 85°C, or even higher than 100°C) and lower than or equal to 350°C, and preferably between 150°C and 250°C.

[0287] The first mixer may comprise a static mixer or a dynamic mixer such as a stirred tank, and preferably comprise a static mixer.

[0288] The diluted molten plastic fraction 124 is then mixed with the heavy hydrocarbon fraction 101 in a second mixer 26, to form a feedstock 125 then introduced into the first hydroconversion reactor of the first hydroconversion section 20, and the hydroconversion step (b) as described later is carried out.

[0289] Said mixing in the mixer 26 is preferably similar to what was described in step (a7) for the mixer 22.

[0290] Prior to its introduction into the mixing device 26, the heavy hydrocarbon fraction 101 may be mixed with an entrained catalyst precursor 104, so that, upon formation of the entrained catalyst, in particular by reaction with sulfur, the entrained catalyst will comprise a colloidal or molecular catalyst dispersed in the feedstock. What has been described on this subject in step (a1) applies here in the same way and is not repeated.

[0291] The entrained catalyst precursor 104 may also be mixed with the diluted molten plastic fraction 124 prior to its mixing with the heavy hydrocarbon fraction in the mixer 26, in addition to or alternatively to mixing the precursor with the heavy hydrocarbon fraction 101. In this case, the mixing is similar to that described for mixing with the heavy hydrocarbon fraction 101.

[0292] The entrained catalyst precursor 104 may further be mixed with the hydrocarbon diluent, as already described above in connection with step (a1) and FIG. 1A in connection with the catalyst precursor, before its mixing with the molten plastic fraction 123 in the mixer 25, in addition to or alternatively to a mixture of the precursor with the heavy hydrocarbon fraction 101 or with the diluted molten plastic fraction 124. In this case, the mixing is similar to what has been described for the mixing with the heavy hydrocarbon fraction 101.

[0293] (b) first hydroconversion step

[0294] The feedstock (101, 102, 114, 117, 119, 122, 125) is introduced, whether the fractions that compose it are separated or mixed, into the first hydroconversion reactor of the first hydroconversion section 20, together with hydrogen and H2S. Said first reactor comprises a first porous supported hydroconversion catalyst.

[0295] The first hydroconversion step (b) is carried out under conditions making it possible to obtain a first hydroconverted effluent 105. Said first hydroconverted effluent 105 contains the conversion products, in particular said first effluent has a reduced content of hydrocarbons having a boiling point of at least 300°C. Said first hydroconverted effluent 105 may also have a reduced content of sulfur, and / or metals, and / or nitrogen, and / or Conradson carbon, and / or asphaltenes, depending on the reactions carried out in the first hydroconversion reactor.

[0296] Step (b) is preferably carried out under an absolute pressure of between 5 MPa and 28 MPa, more preferably between 5 MPa and 25 MPa, and even more preferably between 6 MPa and 20 MPa, at a temperature of between 350°C and 480°C, more preferably between 360°C and 470°C, and preferably between 370°C and 450°C.

[0297] The hourly space velocity (WH) relative to the volume of each reactor is preferably between 0.05 h 1 and 10 a.m. 1 . According to a preferred implementation, the WH is between 0.1 h 1 and 10 a.m. 1 , more preferably between 0.1 h 1 and 5 a.m. 1 , even more preferably between 0.15 h 1 and 2 h- 1 , and even more preferably between 0.15 h 1 and 1 hour 1 . According to another implementation, the WH is between 0.05 h 1 and 0.09 h 1 .

[0298] The amount of hydrogen mixed with the charge is preferably between 50 and 5000 normal cubic meters (Nm 3 ) per cubic meter (m 3 ) of liquid charge, preferably between 100 Nm 3 / m 3 and 2000 Nm 3 / m 3 and very preferably between 200 Nm 3 / m 3 and 1000 Nm 3 / m 3 .

[0299] H2S is used in step (b) for the conversion of the plastic fraction of the feedstock.

[0300] This H2S is contained in the recycled hydrogen stream from the hydroconversion process and recycled to step (a) and / or (b), and optionally to step (d) if the latter is implemented. The H2S content of said recycled stream is a function of the plastic fraction of the feedstock. In particular, the H2S content of said recycled stream is between 2% and 70% by mass relative to the plastic fraction of the feedstock, preferably between 3% and 60% by mass, and more preferably between 3% and 25% by mass, relative to the plastic fraction of said feedstock.

[0301] The mass ratio between KH2S and H2 of the recycled hydrogen stream is advantageously between 0.001% and 20%, preferably between 0.01% and 15%, and more preferably between 0.1% and 10%.

[0302] As described above, the recycled hydrogen stream comprising H2S may be sent to step (a), and alternatively, or in addition, it may be sent directly to step (b) in the first bubbling bed or bubbling-entrained hybrid bed hydroconversion reactor of the first hydroconversion section 20.

[0303] The gaseous H2S from the recycled hydrogen stream helps promote the conversion of the plastic fraction of the feedstock.

[0304] Without being bound by any theory, a radical mechanism involving H2S and HS radicals such as that demonstrated in the prior art and described above, could explain at least in part the promotion of the conversion of the plastic feedstock in this step (b) of the process according to the invention. During this hydroconversion step, a maximum of the plastic fraction of the feedstock is converted. In particular, the process according to the invention advantageously makes it possible to convert more than 70% by weight of the plastic fraction of the feedstock into non-solid conversion products, i.e. liquid and gaseous, preferably more than 75% by weight, even more preferably more than 80% by weight, even more preferably more than 90% by weight, and even more preferably more than 95% or even 98 or 99% by weight.

[0305] The hydrogen required for hydroconversion in step (b) and possibly in step (d) comes partly from the recycled hydrogen stream, but also from a hydrogen stream external to the process (fresh hydrogen). This can be mixed with the feedstock before introduction into the hydroconversion reactor, for example by means of a T-shaped mixing device already described, or it can be introduced directly into the reactor.

[0306] The first hydroconversion section 20 comprises one or more ebullated bed or hybrid reactors, containing at least one first supported hydroconversion catalyst, the reactors being able to be arranged in series and / or in parallel. At this stage, at least one first supported hydroconversion catalyst is therefore maintained in the reactor(s). According to one or more embodiments of the invention, the first hydroconversion section 20 comprises one or more hydroconversion reactors, which can be in series and / or in parallel, operating in an ebullated bed, as used for the H-Oil™ process, as described, for example, in patents US4521295 or US4495060 or US4457831 or US4354852, in the article Aiche, March 19-23, 1995, Houston, Texas, article number 46d, "Second generation ebullated bed technology", or in chapter 3.5 "Hydroprocessing and Hydroconversion of Residue Fractions" from the book "Catalysis by Transition Metal Sulphides", Technip Editions, 2013. According to this or these implementations, each reactor is operated in a fluidized bed called an ebullated bed. Each reactor advantageously includes a recirculation pump which makes it possible to maintain the porous supported solid catalyst in a ebullated bed by continuous recycling of at least a portion of a liquid fraction withdrawn from the upper part of the reactor and reinjected into the lower part of the reactor.

[0307] According to one or more embodiments of the invention, the hydroconversion reactor(s) of the first hydroconversion section 20 are exclusively ebullated bed reactors: the first hydroconversion section 20 does not comprise any hybrid ebullated-entrained bed reactor(s) in the case where no entrained catalyst, formed from an entrained catalyst precursor, is used.

[0308] The bubbling bed reactor preferably comprises at least one inlet located at or near the lower part of the reactor through which the feedstock is introduced together with the hydrogen (and HzS), and in particular two inlets in the case where the plastic fraction of the feedstock is introduced separately from the heavy hydrocarbon fraction, and an outlet at or near the upper part of the reactor through which the first hydroconverted effluent 105 is withdrawn. The reactor preferably further comprises an inlet and an outlet for the supported catalyst as already described above in connection with the means for injecting and withdrawing the supported catalyst. The bubbling bed reactor further comprises an expanded catalyst zone comprising the porous supported catalyst.The ebullated bed reactor also includes a lower supported catalyst-free zone located below the expanded catalyst zone, and an upper supported catalyst-free zone located above the expanded catalyst zone. The feed in the ebullated bed reactor continuously recirculates from the upper supported catalyst-free zone to the lower supported catalyst-free zone by means of a recycle conduit in communication with a boiling pump. At the top of the recycle conduit is preferably a funnel-shaped recycle cup through which the feed is drawn from the upper supported catalyst-free zone. The internal recycled feed is mixed with "fresh" feed and additional hydrogen gas (and optionally H2S mixed with the additional hydrogen gas).

[0309] The first supported hydroconversion catalyst used in the first hydroconversion step (b) may contain one or more elements from groups 4 to 12 of the periodic table of elements, which may or may not be supported. Advantageously, a catalyst comprising an amorphous support, such as silica, alumina, silica-alumina, titanium dioxide or combinations of these structures, and very preferably alumina, may be used. The first supported catalyst may contain at least one non-noble group VIII metal selected from nickel and cobalt, and preferably nickel, said group VIII element preferably being used in combination with at least one group VIB metal selected from molybdenum and tungsten, and preferably the group VIB metal is molybdenum.

[0310] In this description, the groups of chemical elements are given according to the CAS classification (CRC Handbook of Chemistry and Physics, publisher CRC press, editor-in-chief DR Lide, 81st edition, 2000-2001). For example, group VIII (or VI I IB) according to the CAS classification corresponds to the metals of columns 8, 9 and 10 according to the new IUPAC classification.

[0311] Advantageously, the first supported hydroconversion catalyst used in the first hydroconversion step (b) comprises an alumina support and at least one group VIII metal selected from nickel and cobalt, preferably nickel, and at least one group VIB metal selected from molybdenum and tungsten, preferably molybdenum. Preferably, the first supported hydroconversion catalyst comprises nickel as a group VIII element and molybdenum as a group VIB element.

[0312] The content of non-noble group VIII metal, in particular nickel, is advantageously between 0.5% and 10% expressed by weight of metal oxide (in particular NiO), and preferably between 1% and 6% by weight, and the content of group VIB metal, in particular molybdenum, is advantageously between 1% and 30% expressed by weight of metal oxide (in particular molybdenum trioxide IVloOa), and preferably between 4% and 20% by weight. The metal contents are expressed as a percentage by weight of metal oxide relative to the weight of the catalyst.

[0313] This first supported catalyst is advantageously used in the form of extrudates or beads. The beads have, for example, a diameter between 0.4 mm and 4.0 mm. The extrudates have, for example, a cylindrical shape with a diameter between 0.5 mm and 4.0 mm and a length between 1 mm and 5 mm. The extrudates can also be objects of a different shape such as trilobes, regular or irregular tetralobes, or other multilobes. Porous supported catalysts of other shapes can also be used. The size of these different shapes of porous supported catalysts can be characterized by means of the equivalent diameter. The equivalent diameter is defined as six times the ratio between the volume of the particle and the external surface area of ​​the particle. The porous supported catalyst, used in the form of extrudates, beads or other shapes, thus has an equivalent diameter between 0.4 mm and 4.4 mm.These catalysts are well known to those skilled in the art.

[0314] According to one or more embodiments of the invention, the first hydroconversion section 20 comprises one or more hybrid bed reactors (i.e., bubbling-entrained hybrid beds), simultaneously comprising at least one first supported hydroconversion catalyst which is maintained in the reactor and at least one entrained catalyst which enters the reactor with the feedstock and which is entrained out of the reactor with the effluents. In this case, as already described above in relation to step (a), an entrained catalyst precursor was introduced before the injection of the feedstock into the first hydroconversion reactor, and a colloidal or molecular catalyst, also called dispersed, entrained or slurry catalyst, could have formed upstream or formed in situ in the hybrid bed hydroconversion reactor. These entrained catalysts are well known to those skilled in the art.

[0315] According to the invention, in the case where an entrained catalyst is used, the HzS of the recycled hydrogen stream is in large excess compared to the sulfur which is necessary to form the entrained catalyst, i.e. to sulfurize the catalyst precursor to form the catalyst in the form of metal sulfides (e.g. molybdenum disulfide M0S2). The role of the HzS of the recycled hydrogen stream used in step (b), and possibly step (d), is to assist in the conversion of the plastic fraction of the feedstock, and not to participate in the sulfurization of the entrained catalyst or other catalyst.

[0316] Typically, the metal concentration of the catalyst, for example Mo, in the feedstock (i.e. the combined heavy hydrocarbon fraction and plastic fraction) is less than or equal to 500 ppm, preferably less than or equal to 300 ppm by weight, even more preferably less than or equal to 175 ppm by weight, or even less than or equal to 75 ppm by weight or even 50 ppm by weight.

[0317] The H2S content of the recycled hydrogen stream is chosen by those skilled in the art to be in large excess of the sulfur that would be required to form the slurry catalyst by sulfurization, typically by an order of magnitude higher.

[0318] The hybrid bed reactor comprises a solid phase which comprises a porous supported catalyst in the form of an expanded bed, a liquid hydrocarbon phase comprising the feedstock containing the colloidal or molecular catalyst dispersed therein, and a gaseous phase comprising hydrogen (and H2S).

[0319] The hybrid bed reactor is an ebullated bed hydroconversion reactor as described above, but comprising, in addition to the porous supported catalyst in the form of an expanded bed maintained in the reactor, the molecular or colloidal catalyst entrained from the reactor with the hydroconverted liquid effluent 105.

[0320] According to one or more embodiments, the operation of the hybrid bed hydroconversion reactor is based on that of the ebullated bed reactor already described, and further involves the colloidal or molecular catalyst being dispersed throughout the feed in the hybrid bed reactor, including both in the expanded catalyst zone and in zones free of supported catalyst, and thus available to stimulate upgrading reactions in what constitute catalyst-free zones in conventional ebullated bed reactors.

[0321] The presence of colloidal or molecular catalyst in the hybrid bed reactor provides additional catalytic hydrogenation activity, both in the expanded catalyst zone, in the recycle conduit, and in the lower and upper supported catalyst-free zones. Capping free radicals outside the porous supported catalyst minimizes the formation of sediment and coke precursors, which are often responsible for supported catalyst deactivation. This can allow a reduction in the amount of porous supported catalyst that would otherwise be required to carry out a desired hydroconversion reaction. It can also reduce the rate at which the porous supported catalyst must be withdrawn and replenished.

[0322] In one of the implementations of the process according to the invention, a different first supported hydroconversion catalyst may be used in each reactor of the first hydroconversion section, the supported catalyst specific to each reactor being adapted to the feedstock sent to this reactor. In one of the implementations of the process according to the invention, several types of first supported catalyst are used in each reactor.

[0323] As is known, and for example described in patent FR3033797, the first supported hydroconversion catalyst, when used, can be partly replaced by fresh supported catalyst, and / or used supported catalyst but with a catalytic activity higher than the used supported catalyst to be replaced, and / or regenerated supported catalyst, and / or rejuvenated supported catalyst (catalyst from a rejuvenation zone in which the majority of the deposited metals are removed, before sending the used and rejuvenated catalyst to a regeneration zone in which the carbon and sulfur it contains are removed, thus increasing the activity of the catalyst), by withdrawing the used supported catalyst preferably from the bottom of the reactor, and by introducing the replacement supported catalyst either at the top or at the bottom of the reactor.This replacement of used supported catalyst is preferably carried out at regular time intervals, and preferably in bursts or almost continuously. This withdrawal and replacement are carried out using a withdrawal and injection device advantageously allowing the continuous operation of this hydroconversion step. An example of such a device has already been described in relation to step (a), which can also allow the introduction of the plastic fraction according to a specific implementation (see step (a4)).

[0324] With this supported catalyst withdrawal / injection operation, it is therefore not necessary to stop the unit to change the used catalyst, nor to increase the reaction temperatures along the cycle to compensate for deactivation. In addition, working under constant operating conditions makes it possible to obtain constant yields and product qualities throughout the cycle. Also, because the supported catalyst is kept agitated by significant liquid recycling, the pressure drop on the reactor remains low and constant, and the reaction exotherms are quickly averaged over the catalytic bed, which is therefore almost isothermal and does not require the injection of cooling flows ("quenches" in English terminology).

[0325] According to one or more embodiments, when step (b) is carried out in one or more hybrid bed reactors, the feedstock or the entrained catalyst precursor may be premixed with an organic additive, before the feedstock is introduced into the first hydroconversion reactor of the first hydroconversion section 20, in particular in order to minimize fouling of the installations before hydroconversion in the hybrid bed reactor(s).Without being bound by any theory, the organic additive, in admixture with the feedstock, allows for better solubility of the catalyst precursor entrained in the feedstock, avoiding or reducing fouling in particular due to metal deposits in the installations upstream of the hydroconversion reactor, such as in the heating devices, and thus improving the dispersion of the entrained catalyst, thus generating increased availability of the metal active sites, promoting the hydrogenation of free radicals which are precursors of coke and sediments, and generating a substantial reduction in fouling of the installations. Said organic additive, which is neither a catalyst nor a catalyst precursor (e.g. it does not contain metal), has at least one carboxylic acid function and / or at least one ester function and / or at least one acid anhydride function.It preferably comprises at least 6, or even at least 8 carbon atoms, and more preferably at least 8 carbon atoms. For example, the organic additive may be 2-ethylhexanoic acid, naphthenic acid, caprylic acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, ethyl octanoate, ethyl 2-ethylhexanoate, 2-ethylhexyl 2-ethylhexanoate, benzyl 2-ethylhexanoate, diethyl adipate, dimethyl adipate, bis(2-ethylhexyl) adipate, dimethyl pimelate, dimethyl suberate, monomethyl suberate, hexanoic anhydride, caprylic anhydride, and mixtures thereof. The organic additive is preferably added during the mixing step so that the molar ratio of organic additive to the active metal(s) of the catalyst precursor composition (egMo) is between 0.1:1 and 20:1, more preferably between 0.75:1 and 7:1, and even more preferably between 1:1 and 5:1.

[0326] (c) optional intermediate separation step

[0327] According to one or more preferred embodiments, the method further comprises a separation step (c), which separates part, or all, of the first hydroconverted effluent 105, to produce at least two cuts, including a heavy cut boiling predominantly at a temperature greater than or equal to 350°C.

[0328] The other cut(s) are one or more light and intermediate cut(s). The light cut thus separated mainly contains gases (H2, H2S, NH3, and C1-C4), naphtha (cut which boils at a temperature below 150°C), kerosene (cut which boils between 150°C and 250°C), and at least part of the diesel (fraction which boils between 250°C and 375°C). The light cut can then be sent at least partially to a fractionation unit (not shown in the figures) where the light gases are extracted from said light cut, for example by passing through an expansion drum.The gaseous hydrogen and H2S thus recovered, which are advantageously sent to a treatment and recycling step (g) preferably using a purification and compression unit, can advantageously be recycled, in particular in the form of the recycled hydrogen stream comprising E S, to the first hydroconversion step (b), and / or to the second hydroconversion step (d) if it is implemented, but also to step a). The recovered gaseous hydrogen and the gaseous HzS can also be used in other installations of the refinery.

[0329] The optional separation step (c) is carried out in a separation section (not shown in the figures), which comprises any separation means known to a person skilled in the art. Said separation section may comprise one or more flash drums arranged in series, and / or one or more steam and / or hydrogen stripping columns, and / or an atmospheric distillation column, and / or a vacuum distillation column, and preferably consists of a single flash drum, commonly referred to as a "hot separator".

[0330] (d) optional second hydroconversion step

[0331] According to one or more preferred embodiments (not shown in the figures), the method further comprises a second hydroconversion step, in at least one second ebullated bed or hybrid bed reactor comprising a second porous supported catalyst, in the presence of hydrogen and E S, of part or all of the first effluent 105 resulting from step (b), or optionally of the heavy cut resulting from step (c). This second hydroconversion step is carried out so as to produce a second hydroconverted effluent. Said second hydroconverted effluent advantageously contains a larger quantity of conversion products than the first hydroconverted effluent, and in particular an even lower content of hydrocarbons having a boiling point of at least 300°C.The second hydroconverted effluent may have a reduced Conradson carbon residue, and optionally a reduced amount of sulfur, and / or nitrogen, and / or metals, and / or asphaltenes.

[0332] The second hydroconversion step is carried out in a manner similar to that described for the first hydroconversion step (b), and is not repeated here. This applies in particular to the operating conditions, the equipment used, the porous supported hydroconversion catalysts used, with the exception of the details mentioned below.

[0333] As for the first hydroconversion step (b), the second hydroconversion step is carried out in at least one second ebullated bed or hybrid reactor. It is preferably carried out in one or more ebullated bed reactors if the first hydroconversion step is also carried out in one or more ebullated bed reactors, and it is preferably carried out in one or more hybrid bed reactors if the first hydroconversion step is carried out in one or more hybrid bed reactors.

[0334] In this second hydroconversion step, the operating conditions may be similar or different from those in hydroconversion step (d), the temperature remaining in the range between 350°C and 480°C, preferably between 360°C and 470°C, more preferably between 370°C and 450°C, more preferably between 400°C and 440°C, and even more preferably between 410°C and 435°C, and the amount of hydrogen introduced into the reactor remaining in the range between 50 Nm 3 / m 3 and 5,000 Nm 3 / m 3 liquid charge, preferably between 100 Nm 3 / m 3 and 3,000 Nm 3 / m 3 , and even more preferably between 200 Nm 3 / m 3 and 2,000 Nm 3 / m 3 . The other pressure and WH parameters are in the same ranges as those described for the hydroconversion step (d).

[0335] The operating temperature in the second hydroconversion stage (d) may be higher than the operating temperature in the first hydroconversion stage (b). This may allow for more complete conversion of the unconverted feedstock. Hydroconversion of liquid products from the first hydroconversion stage and feedstock conversion are enhanced, as are hydrotreating reactions such as hydrodesulfurization and hydrodenitrogenation, among others. Operating conditions are chosen to minimize the formation of solids (e.g., coke).

[0336] The second porous supported hydroconversion catalyst used in the second hydroconversion reactor may be the same as that used in the first hydroconversion reactor(s) of the first hydroconversion section 20, or may be another porous supported catalyst also suitable for hydroconversion of the treated feedstock, as defined for the first supported catalyst used in the first hydroconversion step (b).

[0337] (e) fractionation step

[0338] The first hydroconverted effluent 105 from the hydroconversion step (b), or from the second hydroconversion step (d) if such a step is implemented, then undergoes at least in part a fractionation step (e) in a fractionation section 30.

[0339] This fractionation step (e) separates part or all of said hydroconverted effluent into several fractions including at least one heavy liquid product 106b boiling predominantly at a temperature above 350°C, preferably above 500°C and more preferably above 540°C. The heavy liquid product 106b contains a part boiling at a temperature above 540°C, called the residual fraction (or vacuum residue), which is the unconverted part. The heavy liquid product 106b may contain a part of the diesel fraction boiling between 250°C and 375°C and a part boiling between 375°C and 540°C (also called the vacuum distillate).

[0340] This fractionation step therefore produces at least two products including the heavy liquid product 106b as described above, the other product(s) 106a being light and intermediate cut(s).

[0341] Preferably, step (e) comprises a gas / liquid separation producing at least one gas stream comprising hydrogen and HzS sent to the hydrogen treatment and recycling step (g). The fractionation section 30 comprises any separation means known to those skilled in the art. The fractionation section 30 may thus comprise one or more of the following separation equipment: one or more flash drums arranged in series, and preferably a chain of at least two successive flash drums, one or more steam and / or hydrogen stripping columns, an atmospheric distillation column, a vacuum distillation column.

[0342] According to one or more embodiments, this fractionation step (e) is carried out by a sequence of at least two successive flash balloons.

[0343] According to one or more other embodiments, this fractionation step (e) is carried out by one or more steam and / or hydrogen stripping columns.

[0344] According to one or more preferred embodiments, this fractionation step (e) is carried out by an atmospheric distillation column, and more preferably by an atmospheric distillation column and a vacuum column receiving the atmospheric residue.

[0345] According to the most preferred embodiment(s), this fractionation step (e) is carried out by one or more flash drums, an atmospheric distillation column and a vacuum column receiving the atmospheric residue. This configuration makes it possible to reduce the size of any downstream deasphalter, thus minimizing investment costs and operating costs.

[0346] The fractionation section 30 may also receive, in addition to part or all of the hydroconverted liquid effluent, one or more additional effluents such as one or more hydrocarbon feeds external to the process (e.g. atmospheric and / or vacuum distillates, atmospheric and / or vacuum residues), a part of the heavy cut from the separation step (c) if it is implemented, a part of one or more of the intermediate cuts from the fractionation step (e), a part of a DAO or a light or heavy fraction of a DAO if a deasphalting step (fl) is carried out.

[0347] (f) further processing step(s)

[0348] One or more further processing steps (f) of the heavy liquid product 106b and / or of the other product(s) from the fractionation step (e) may be carried out.

[0349] The various hydrocarbon products that may result from the fractionation step (e) in the fractionation means 30 may be sent to various processes in the refinery, illustrated in the figures under the general reference 40, and the details of these post-treatments are not described herein being generally known to those skilled in the art. For example, gaseous fractions, naphtha, middle distillates, VGO, DAO may be sent to hydrotreatment, steam cracking, fluidized catalytic cracking (FCC), hydrocracking, lube oil extraction processes, etc. Residues (atmospheric or vacuum residues) may also be post-treated, or used for other applications such as gasification, bitumen production, heavy fuel oils, etc. Heavy fractions, including residues, may also be recycled into the hydroconversion process, for example in a hydroconversion reactor in step (b) or (d).

[0350] According to one or more embodiments, the hydroconversion process comprises a deasphalting step (fl), in a deasphalter, of part or all of said heavy liquid product 106b obtained in the fractionation step (e), with at least one hydrocarbon solvent, to produce a deasphalted oil DAO and a residual asphalt (step "SDA" for Solvent DeAsphalting according to English terminology).

[0351] Such a deasphalting step (fl) is carried out under conditions well known to those skilled in the art. Reference may thus be made to the article by Billon et al. published in 1994 in volume 49, No. 5 of the Revue de l'institut Français du Pétrole, pages 495 to 507, to the book "Refining and conversion of heavy petroleum products" by JF Le Page, SG Chatila and M Davidson, Edition Technip, pages 17 - 32 or to patents US4239616, US4354922, US4354928, US4440633, US4536283, and US4715946. The deasphalting may be carried out in one or more mixer-settlers or in one or more extraction columns. The deasphalter thus comprises at least one mixer-settler or at least one extraction column.Deasphalting is a liquid-liquid extraction generally carried out at an average temperature between 60°C and 250°C with at least one low-boiling hydrocarbon solvent, preferably a paraffinic solvent, and preferably heavier than propane, preferably having 3 to 7 carbon atoms. Preferred solvents include propane, butane, isobutane, pentane, isopentane, neopentane, hexane, isohexanes, C6 hydrocarbons, heptane, C7 hydrocarbons, more or less apolar light gasolines, as well as mixtures obtained from the aforementioned solvents. Preferably, the solvent is butane, pentane or hexane, as well as mixtures thereof. The solvent / feed ratios (volume / volume) entering the deasphalter are generally between 3 / 1 and 16 / 1, and preferably between 4 / 1 and 8 / 1. Preferably, the deasphalter comprises at least one extraction column, and preferably only one (egas implemented in the Solvahl™ process) in which the solvent / feed ratios (volume / volume) entering the deasphalter are preferably low, typically between 4 / 1 and 8 / 1, or even between 4 / 1 and 6 / 1. The deasphalter produces a DAO practically free of C7 asphaltenes, said C7 asphaltene content being preferably less than 2% by weight, more preferably less than 0.5% by weight, even more preferably less than 0.05% by weight, and a residual asphalt concentrating the majority of the impurities in the residue, said residual asphalt being withdrawn. The DAO yield is generally between 40% by weight and 95% by weight depending on the operating conditions and the solvent used, and depending on the feed sent to the deasphalter and in particular the quality of the heavy liquid product 106b.

[0352] When it is desired to recycle part of the heavy residue fraction (e.g. part of the heavy liquid product 106b and / or part of the residual asphalt, or part of the DAO) in the hydroconversion system (e.g. in the first hydroconversion reactor or upstream), it may be advantageous, in the case of operation in hybrid bed reactors, to leave the catalyst entrained in the residues, and / or the residual asphalt fraction. A purge on the recycled stream may be implemented, generally to prevent certain compounds from accumulating at excessive levels.

[0353] (g) hydrogen treatment and recycling step

[0354] The process according to the invention advantageously comprises a step of treatment and recycling of hydrogen, to form the recycled hydrogen stream comprising H2S used during the hydroconversion in step (b), and optionally in step (d).

[0355] A gaseous stream comprising in particular H2 and H2S from the fractionation step (e), and / or the separation step (c) if the latter is implemented, said step (e) and / or said step (c) comprising a gas / liquid separation, is sent to step (g).

[0356] In step (g), the H2S content of said recycled hydrogen stream produced is controlled by adding H2S, or removing H2S from said gaseous stream comprising hydrogen and H2S, to produce said recycled hydrogen stream containing H2S, at a content of between 2% and 70% by mass of the plastic fraction of the feedstock, which is sent to step (a) and / or step (b) and optionally step (d).

[0357] It may be advantageous to use the H2S produced during the hydroconversion steps of the process together with the hydrogen gas for recycling in the form of a common stream, in particular to avoid the external supply of H2S necessary for the hydroconversion in step (b) and possibly step (d), and thus save on external utility but also simplify the process. It is also an advantage to limit, or even eliminate where possible, the purification of the hydrogen gas to be recycled in the process, in particular the removal of H2S which is on the contrary desired at specific contents in the recycled hydrogen stream. The purification unit, in particular the H2S removal section, which may typically comprise at least one amine scrubbing column, may thus be of reduced size, or operate with less expensive solvents etc.

[0358] Advantageously, step (g) implements at least one, preferably several, or even all, of the following sections: a washing section, preferably comprising an amine washing column, a recycle compression section, a high pressure purification section, a fresh H2 makeup compression section, an H2S makeup compression section, and a mixing section.

[0359] According to one or more implementations, step (g) uses a washing section which preferably comprises an amine washing column to purify at least one gas stream comprising H2 and H2S at the outlet of the reaction and separation units. Such a section makes it possible to reduce the H2S content of the hydrogen stream to be recycled, so as to achieve a target H2S content in the recycled hydrogen stream, suitable for the conversion of the plastic fraction of the feedstock in the hydroconversion step(s). Such a section can also remove the H2S from the hydrogen stream to be recycled, said H2S then being able to be reinjected into the purified hydrogen stream, at a later stage after further purification, or with a time lag to respond to changes in the composition of the feedstock for example, the H2S then preferably being temporarily stored. Amine washing columns and their operation are well known.

[0360] According to one or more implementations, the washing section comprises an amine washing column, which is not used and is bypassed by the hydrogen stream to be recycled (bypass), in the case where the H2S content in the hydrogen stream to be recycled corresponds to the desired content for the hydroconversion of the feedstock.

[0361] The gas stream comprising Hz and HzS from the reaction and separation units can feed, preferably directly, i.e. without an intermediate step, the washing section which advantageously comprises at least one amine washing column. The washing section is preferably fed with an aqueous solution of amines, for example chosen, without being exhaustive, from N-methyldiethanolamine (MDEA), diisopropylamine (DIPA), monoethanolamine (MEA), diethanolamine (DEA), and mixtures thereof, at an amine content which can be between 5% and 95% by weight of amines per weight of water, preferably between 10% and 90%, more preferably between 20 and 60% by weight, preferably between 30 and 50% by weight of amines per weight of water.The weight flow rate of aqueous amine solution is advantageously adjusted as a function of the weight flow rate of H2S of the effluent to be washed, so as to reduce the quantity of H2S in the washed gas stream, in particular so as to achieve a target H2S content in the hydrogen stream to be recycled, depending on the plastic fraction of the feedstock to be converted during the hydroconversion. Preferably, the temperature of the washing amine solution is at least 10°C higher than the temperature of the gas stream entering the column, so as not to condense said gas stream and entrain it to the bottom of the column.

[0362] According to one or more implementations, step (g) does not use a washing section, in particular an amine washing column, to purify the gas stream, and in particular to remove the H2S, comprising H2 and H2S from the reaction and separation units. This or these implementations are suitable when the H2S contained in the gas stream from the reaction and separation units is in small quantity, in particular in insufficient quantity compared to a target content necessary for the conversion of the plastic fraction of the feedstock in the hydroconversion step(s). In this case, step (g) advantageously comprises a fresh H2S make-up compression section to in particular enrich the hydrogen stream to be recycled with H2S.

[0363] According to one or more implementations, step (g) uses a high-pressure purification section, which conventionally comprises a membrane, and which aims to eliminate as much as possible the residual impurities, such as the residual H2S gas, and / or the light hydrocarbon compounds comprising between 1 and 4 carbon atoms, i.e. the C1, C2, C3 and / or C4 hydrocarbon compounds. Membranes having selective permeabilities can be chosen according to the gaseous compounds that it is desired to eliminate. A purified gas stream is thus obtained, as well as a waste gas stream, also called by the English term "tail gas", which comprises the residual impurities and which is advantageously purged. At least a fraction of the gas stream from the reaction and separation units, or of the washed stream (and optionally purified in the high-pressure purification section) can be sent to said high-pressure purification section.

[0364] The person skilled in the art knows how to choose the membrane to be used in said high-pressure purification section based on the data from the membrane suppliers, in particular so as to minimize the pressure drop between the inlet and the outlet of said membrane while aiming for a satisfactory purity of the flow treated by said membrane. Thus, the membrane used in the high-pressure purification section is very advantageously chosen on the basis of the data from the membrane suppliers, so that the pressure ratio between the inlet of the membrane and the outlet of the membrane is less than or equal to 5, preferably less than or equal to 2, and so that the membrane allows an outlet purity greater than or equal to 80%.

[0365] The high-pressure purification phase thus makes it possible to achieve a high level of purification of the gas stream, which becomes comparable to a hydrogen stream with high purity. However, the pressure of the gas stream drops considerably in this purification section; it can be divided by approximately two between the inlet of the section and the outlet. For example, the pressure of a fraction of the washed gas stream, upstream of the membrane (i.e. at the membrane inlet), can be between 10 and 20 MPa, more particularly between 14 and 17 MPa, and the pressure of the purified stream at the membrane outlet can then be between 5 and 14 MPa, in particular between 6 and 10 MPa, for example 8 MPa. Sending the washed gas stream to a compression section is then necessary, as described later.In addition, the high-pressure purification section may optionally comprise, prior to the membrane, a cooling system for cooling in particular to a temperature between 30 and 50°C the fraction of the gas flow sent to the membrane. The high-pressure purification section may also comprise an adsorption system, preferably consisting of two adsorbent columns operating in a “swing” mode, preferably located downstream of the membrane to remove any residual impurities. In the “swing” operating mode, one of the two columns is in line, i.e. in operational mode, while the other column is in reserve. When the adsorbent of the in-line column is used up, this column is isolated while the reserve column is put in line.The spent adsorbent can then be regenerated in situ and / or replaced with fresh adsorbent to be brought back online once the other column has been isolated.

[0366] Advantageously, step (g) does not implement a high-pressure purification section, conventionally comprising a membrane, and which aims to further purify the gas stream. According to one or more implementations, step (g) does not implement a washing section or high-pressure purification aimed at removing the HzS from the gas stream, with a view to forming the recycled hydrogen stream comprising I-S.

[0367] Step (g) advantageously comprises a compression and make-up section(s), to enrich the gaseous flow of hydrogen and I-hS from the reaction and separation units, preferably washed (and optionally purified), in hydrogen with a make-up of fresh hydrogen advantageously supplying said compression and make-up section, and optionally in H2S with a make-up of fresh I-hS advantageously supplying said section to increase if necessary the H2S content of the recycled hydrogen flow. The quantity of the hydrogen make-up advantageously corresponds to the quantity of hydrogen consumed in the reaction units of the hydroconversion process. The quantity of the H2S make-up advantageously corresponds to the complement necessary to the H2S already present in the flow to be recycled to reach the required target content depending on the plastic fraction of the feedstock to be converted.The said compression section makes it possible to achieve the necessary hydrogen pressure at the inlets of the reaction units used in the hydroconversion process.

[0368] The compression and make-up section comprises at least one compressor, called make-up compressor(s), preferably at least two, preferably between two and three, preferably three make-up compressors, or a multi-stage compressor preferably comprising at least two compression stages, preferably between two and three compression stages, preferably 3 compression stages, in order to compress the hydrogen stream to be recycled comprising the fresh hydrogen make-up and possibly the H2S make-up to a pressure of between 2 and 38 MPa, preferably between 5 and 25 MPa, preferably between 6 and 20 MPa, in particular a pressure of between 12 and 18 MPa. Very preferably, the compression and make-up section comprises a multi-stage compressor comprising between two and three compression stages, preferably three compression stages.

[0369] The said compression and make-up section(s) makes it possible to obtain the recycled hydrogen flow comprising the H2S.

[0370] Preferably, an H2S purge of the hydrogen stream to be recycled is carried out, and a make-up of fresh H2S is carried out in the recycled hydrogen stream.

[0371] Step (g) of treatment and recycling of hydrogen thus allows the recycling of hydrogen in the form of a stream comprising H2 and H2S, to step (a) and / or (b) and possibly (d) of the process, to be used for the hydroconversion of the feedstock in step (b) and possibly in step (d).

[0372] Examples

[0373] The examples below are intended to demonstrate certain performances of the process according to the invention. In these examples, the improvement of the conversion of plastics in a hydroconversion process, in particular in an ebullated bed of the H-Oil™ type, is illustrated, with a view to their chemical recycling, the products obtained being able in turn to serve as raw material for new plastics or bases for manufacturing fuels, lubricants or any other product resulting from the refining of oil. The method of insertion of these plastics is also illustrated, initially in the form of solid particles which are dispersed, melted and dissolved in a mixer prior to the reaction. The experiments in this example were carried out in a closed reactor (called "batch"), representative of the H-Oil™ process.

[0374] Example 1 is a reference example illustrating the performance of the hydroconversion process for a vacuum residue feedstock without plastic. This example allows the process performance to be determined when no plastic has been added.

[0375] Example 2 illustrates the performance of a hydroconversion process, in particular in an ebullated bed such as an H-Oil™ process, with a feed comprising the plastic fraction and the heavy fraction as defined below, with the implementation of a dispersion / dissolution pre-step making it possible to convert said plastic into lighter hydrocarbons of the light, middle and vacuum distillate type which can be recovered in the refinery.

[0376] Example 3 illustrates the performance of a hydroconversion process, in particular in an ebullated bed such as an H-Oil™ process, with a feed comprising the plastic fraction and the heavy fraction as defined below, with the implementation of a dispersion / dissolution pre-step making it possible to convert said plastic into lighter hydrocarbons of the light, middle and vacuum distillate type which can be recovered in the refinery. This example illustrates the improvement in the conversion of the plastics in the feed into cuts of interest for petrochemicals and / or fuel manufacturing by adding H2S to the hydrogen used during the hydroconversion in accordance with the invention. The mass ratio of H2S added to the plastic fraction of the feed is 0.55.

[0377] Charge :

[0378] The heavy fraction (I) of the feedstock is a straight-run vacuum residue (RSV-SR) coming directly from the distillation of crude oil. The plastic fraction (II) of the feedstock is a mixture of plastics from conventional sorting processes, containing mainly low-density polyethylene (65%) but also a little high-density polyethylene (35%). This is in the form of solid particles with dimensions between 500 pm and 1 cm maximum. The main characteristics of these two fractions of the feedstock are presented in Table 1 below.

[0379] Table 1

[0380] The operating conditions for these two examples are summarized in Table 2 below. Table 2 Procedure for example 1:

[0381] The batch reactor is loaded with 100% RSV-SR (fraction I of the feed), preheated to 100°C to make it less viscous. The reactor is closed, purged with nitrogen, purged with hydrogen, and then pressurized with hydrogen to a pressure of approximately 3 MPa. The reactor is then heated to 100°C. At this temperature, stirring is started at 500 rpm. 1 . Gradually, the temperature is increased from 100°C to the reaction temperature and, in parallel, the stirring is gradually increased from 500 to 1000 rpm. 1. When the reaction temperature is reached, the pressure in the reactor is instantly adjusted to the target value by adding Ib- At this time, the reaction time is counted down. At the end of the experiment duration, the reactor is rapidly cooled to stop the reaction, stirring is stopped when the reactor is at room temperature, and the liquid effluent and gases are collected for analysis.

[0382] Procedure for example 2:

[0383] The batch reactor is first charged with 95% RSV-SR (fraction I of the charge), then the 5% plastics (fraction II of the charge) are added and manually dispersed for a few seconds in the RSV-SR, previously heated to 100°C to make it less viscous. To ensure perfect homogeneity of the mixture, the reactor is closed, purged with nitrogen, purged with hydrogen, and then pressurized with hydrogen to a pressure of approximately 3 MPa. The reactor is then heated to 100°C. At this temperature, stirring is started at 500 rpm. 1 . Gradually, the temperature is increased from 100°C to 200°C and, at the same time, the stirring is gradually increased from 500 to 1000 rpm. 1At 200°C, the pressure in the reactor is then 4 MPa. A one-hour hold at this temperature is observed to ensure proper dissolution and dispersion of the plastic (fraction II of the feed) in the RSV-SR (fraction I of the feed). Following this hold, the batch reactor is heated to the reaction temperature, at which point the pressure in the reactor is instantly adjusted to the target value by adding Ib. At this point, the reaction time is counted. At the end of the experiment, the reactor is rapidly cooled to stop the reaction, stirring is stopped when the reactor is at room temperature, and the liquid effluent and gases are sampled for analysis.

[0384] Procedure for example 3:

[0385] A mixture of Ib and I-bS is first made under pressure in a buffer tank of the unit, in the proportions 95% vol. of Ib and 5% vol. of I-bS. The batch reactor is then loaded with the 95% of RSV-SR (fraction I of the charge), then the 5% of plastics (fraction II of the charge) are added and manually dispersed for a few seconds in the RSV-SR, previously heated to 100°C to make it less viscous. In order to ensure perfect homogeneity of the mixture, the reactor is closed, purged with nitrogen, purged with hydrogen, then pressurized with the gas mixture lb / H2S to a pressure of approximately 3 MPa. The reactor is then heated to 100°C. At this temperature, stirring is started at 500 rpm. 1 . Gradually, the temperature is increased from 100°C to 200°C and, at the same time, the stirring is gradually increased from 500 to 1000 rpm. 1At 200°C, the pressure in the reactor is then 4 MPa. A one-hour hold at this temperature is observed to ensure good dissolution and dispersion of the plastic (fraction II of the feed) in the RSV-SR (fraction I of the feed). Following this hold, the batch reactor is heated to the reaction temperature, at which temperature the pressure in the reactor is instantly adjusted to the target value by adding the H2 / H2S gas mixture up to the test pressure. At this point, the reaction time is counted. At the end of the experiment, the reactor is rapidly cooled to stop the reaction, stirring is stopped when the reactor is at room temperature, and the liquid effluent and gases are sampled for analysis. Results and overall performance:

[0386] The results regarding the quality of the total liquid effluent and the hydroconversion performances of these two examples are detailed in Table 3 below.

[0387] Table 3 The conversion of the 540°C+ cut is calculated by mass difference between the feed and the total liquid effluent, such as:

[0388] The conversion of plastics is obtained by difference in masses between the plastic in the load and the plastic remaining in the total liquid effluent, according to:

[0389] The mass of plastic in the feedstock is perfectly known; this is an operational data. The mass of unconverted plastic in the effluent is obtained by DSC (Differential Scanning Calorimetry), which is a calorimetric method suitable for qualifying and quantifying plastics.

[0390] The principle is as follows: all crystalline or semi-crystalline materials (like most plastics) have first-order changes of state (melting and crystallization). As such, a melting temperature and an associated enthalpy of change of state can be determined, notably by DSC calorimetric analysis. In the case of plastics, the melting temperature is characteristic of the type of plastic, the enthalpy of change of state is characteristic of the degree of crystallinity of this plastic. All amorphous materials and liquids (like RSV-SR and hydroconversion effluents) do not have a melting type transition and do not give any response in DSC. A DSC measurement of a mixture of plastic and hydrocarbons (feed or effluent) therefore has the thermal signature of a semi-crystalline material only if there is unconverted plastic.In this case, from the distillation yields of the 350+ °C cut of the effluent, a DSC measurement of this cut and a DSC measurement of the pure plastic, it is possible to determine the quantity of plastic remaining and not converted in the effluent. Otherwise, if the DSC does not show any particular signature, then the plastic has been completely converted.

[0391] In this study, the plastics used are semi-crystalline: DSC is therefore an appropriate analytical tool to determine their conversion.

[0392] The results of Example 2 show that the plastic is converted up to 65% according to the reference operating mode of the hydroconversion process. The results of Example 3 demonstrate that according to the operating mode according to the invention, the conversion of plastics is significantly improved and is total in the hydroconversion process. Furthermore, the comparison of the results of Examples 1 and 3 illustrates that according to the operating mode of the invention, the plastics are mainly converted into cuts of interest of the PI-180 °C or 180-350 °C type, which can then be sent to petrochemical units to make new plastics or any other product from oil refining. Finally, note that an increase in the sediment content is observed between Examples 1 and 2, a sign either that the formation of sediments is favored by the presence of plastic, or that they trap unconverted plastics.This content decreases between examples 2 and 3 until it falls almost to the detection limit of the IP375 standard (0.01% mass), a sign that not only has the HzS had a beneficial impact on sediment formation, but also that there is no longer any residual solid plastic in the hydroconversion effluent of example 3. The comparison of the sediment contents of examples 1 and 3 is not carried out because the difference between the two values ​​is not sufficiently significant according to the IP375 standard.

[0393] Regardless of the example, visual observation of the experimental material, the used catalyst, the effluent, as well as the low sediment content, further indicate that there is no abnormal presence of coke in the reactor.

Claims

Claims 1. Process for hydroconversion of a feedstock comprising the following successive stages: (a) conditioning and introducing said feed into a first hydroconversion section (20) comprising at least one first ebullated bed or ebullated-entrained hybrid bed hydroconversion reactor comprising a first porous supported hydroconversion catalyst, said feed comprising a minor portion of a plastic fraction and a major portion of a heavy hydrocarbon fraction containing a portion of at least 50% by weight having a boiling point of at least 300°C, and containing sulfur and nitrogen; (b) a first step of hydroconversion of said feedstock in the presence of hydrogen and H2S in said first hydroconversion section (20) to obtain a first hydroconverted effluent (105); (c) optionally a step of separating part or all of said first effluent resulting from step (b), to form at least one heavy cut boiling mainly at a temperature greater than or equal to 350°C; (d) optionally a second hydroconversion step in a second hydroconversion section comprising at least one second ebullated bed or ebullated-entrained hybrid bed hydroconversion reactor of part or all of said first effluent resulting from step (b) or optionally of said heavy cut from step (c), said second hydroconversion reactor comprising a second porous supported catalyst and operating in the presence of hydrogen and H2S, to produce a second hydroconverted effluent; wherein step (b) and optional step (d) are carried out at an absolute pressure of between 5 MPa and 28 MPa, at a temperature of between 350°C and 480°C, at an hourly space velocity relative to the volume of each hydroconversion reactor of between 0.05 h 1 and 10 a.m. 1 , and with a quantity of hydrogen between 50 Nm 3 / m 3 and 5000 Nm 3 / m 3, and in which the H2S is used in step (b), and optionally step (d), for the conversion of the plastic fraction of the feedstock, and is contained in a stream of recycled hydrogen from the hydroconversion process and recycled in step (a) and / or (b), and optionally in step (d), the H2S content being between 2% and 70% by mass relative to the plastic fraction of said feedstock; (e) a step of fractionating all or part of said first hydroconverted effluent from step (b) or said second hydroconverted effluent from step (d), in a fractionation section (30), to produce at least one heavy liquid product (106b) which boils predominantly at a temperature greater than or equal to 350°C, said heavy liquid product containing a residual fraction which boils at a temperature greater than or equal to 540°C.

2. Method according to claim 1, in which the H2S content is between 3% and 60% by mass, preferably between 3% and 25% by mass, relative to the plastic fraction of said charge.

3. Method according to any one of the preceding claims, in which the mass ratio between the HÎS and the Hz of said recycled hydrogen stream is between 0.001% and 20%, preferably between 0.01% and 15%, preferably between 0.1% and 10%.

4. Method according to any one of the preceding claims, in which the fractionation step (e) and / or the optional separation step (c) comprises a gas / liquid separation producing at least one gas stream comprising hydrogen and H2S sent to a hydrogen treatment and recycling step (g), and the H2S content of said recycled hydrogen stream is controlled in step (g) by adding H2S or by removing H2S from said gas stream comprising hydrogen and H2S to produce said recycled hydrogen stream containing H2S.

5. Method according to any one of the preceding claims, wherein said recycled hydrogen stream containing H2S is injected in step (a).

6. Method according to any one of the preceding claims, wherein, in step (a), the plastic fraction and the heavy hydrocarbon fraction of the feedstock (114, 117, 120, 122, 125) are introduced mixed into said at least one first hydroconversion reactor of the first hydroconversion section (20).

7. Method according to claim 6, wherein, in step (a), the plastic fraction in the form of solid particles (102), optionally previously mixed with a diluent (107), is mixed with the heavy hydrocarbon fraction (101) so as to form a suspension (113, 116), said suspension (113, 116) being heated to a temperature above the melting temperature of said plastic fraction to form the feedstock (114) introduced into the first hydroconversion reactor.

8. A method according to any one of claims 1 to 5, wherein, in step (a), the plastic fraction (103, 109, 110, 112) and the heavy hydrocarbon fraction (101) of the feedstock are introduced separately into said at least one first hydroconversion reactor of the first hydroconversion section (20).

9. A method according to any one of the preceding claims, wherein the feedstock comprises between 1% and 49% by weight of said plastic fraction and between 51% and 99% by weight of said heavy hydrocarbon fraction.

10. A method according to claim 9, wherein the feedstock comprises between 1% and 45% by weight of said plastic fraction and between 55% and 99% by weight of said heavy hydrocarbon fraction.

11. A method according to claim 10, wherein the feedstock comprises between 1% and 30% by weight, preferably between 2% and 25% by weight, of said plastic fraction, and comprises between 70% and 99% by weight, preferably between 75% and 98% by weight, of said heavy hydrocarbon fraction.

12. Method according to any one of the preceding claims, in which the hydroconversion reactor(s) of the first hydroconversion section (20) in step (b), and optionally in step hydroconversion section (d), are bubbling-entrained hybrid bed reactors, said method further comprising a step of introducing a catalyst precursor (104), preferably molybdenum 2-ethylhexanoate, before injecting said feedstock into said at least one first bubbling-entrained hybrid bed reactor of the first hydroconversion section (20), such that a colloidal or molecular catalyst, preferably comprising molybdenum disulfide, is formed when said catalyst precursor reacts with sulfur.

13. A process according to any one of the preceding claims, wherein the first hydroconversion catalyst, and optionally the second hydroconversion catalyst, contains at least one non-noble group VIII metal chosen from nickel and cobalt, preferably nickel, and at least one group VIB metal chosen from molybdenum and tungsten, preferably molybdenum, and comprising an amorphous support, preferably alumina.

14. A process according to any one of the preceding claims, wherein the heavy hydrocarbon fraction comprises, and may consist of, at least one of the following feedstocks, alone or in a mixture: a crude oil, a topped crude oil, an atmospheric residue or a vacuum residue from the atmospheric or vacuum distillation of a crude oil, an atmospheric residue or a vacuum residue from the atmospheric or vacuum distillation of an effluent from a thermal conversion or hydrotreatment or hydrocracking or hydroconversion unit or a direct coal liquefaction unit or a direct lignocellulosic biomass liquefaction unit, a vacuum distillate obtained directly from a crude oil or a cut from a fluid catalytic cracking unit or a hydrocracking unit or a hydroconversion unit or a coking unit or a visbreaking,a vacuum distillate from the direct liquefaction of coal, aromatic cuts extracted from a lubricant production unit, a deasphalted oil or asphalt from a deasphalting unit, and preferably is a vacuum residue from the vacuum distillation of a crude oil., 15. Method according to any one of the preceding claims, in which the plastic fraction of the filler comprises at least 50% by weight, preferably at least 80% by weight, more preferably at least 90% by weight, and very preferably at least 94% by weight, of polyolefins relative to the total weight of the plastic fraction, said polyolefins preferably being chosen from the list consisting of polyethylene, polypropylene, copolymers of ethylene and propylene.

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