Low-sulfur marine fuel composition

Abstract

The present invention relates to a liquid marine fuel composition of which the sulfur content is less than or equal to 0.50% by mass, and which comprises at least one base consisting of a visbroken residue derived from a crude oil and at least 100 ppm by mass, relative to the total mass of the composition, of one or more additives selected from modified alkylphenol-aldehyde resins which can be obtained by Mannich reaction of an alkylphenol-aldehyde condensation resin with at least one aldehyde and / or ketone having from 1 to 8 carbon atoms and at least one hydrocarbon compound having at least one alkylpolyamine group having from 1 to 30 carbon atoms. The present invention also relates to the use of such a modified alkylphenol-aldehyde resin in a low-sulfur liquid marine fuel composition, for improving the storage stability thereof and preventing sedimentation phenomena.

Description

[0001] DESCRIPTION

[0002] TITLE: Low Sulfur Marine Fuel Composition

[0003] The subject of the present invention is a fuel composition intended for boats and in particular ships, which has a sulfur content of less than or equal to 0.50% by mass and contains a particular additive ensuring its stability during storage.

[0004] The present invention also relates to the use of this additive in a marine fuel.

[0005] Maritime transport accounts for approximately 80% of global freight transport. The fuel traditionally used by shipping vessels is heavy fuel oil containing petroleum bases consisting of distillation residues and / or thermal and / or catalytic cracking residues, generally considered to be final refinery residues. Until 2020, marine fuels could contain substantial sulfur contents, up to 3.5% by mass. However, the combustion of such fuel oils causes sulfur oxide emissions that are potentially harmful to the environment and health.

[0006] This is why the International Maritime Organization (IMO) has embarked on a process of drastically reducing the sulfur content of fuels used in ships. The IMO 2020 regulation, which came into force on 1 erJanuary 2020, limited the sulfur content of marine fuels to a maximum of 0.50% by mass.

[0007] As a result, petroleum bases used in the formulation of heavy fuel oils must now undergo hydrotreatments (hydrocracking, hydrodesulfurization) aimed at reducing their sulfur content or be derived from crude oils with sulfur-containing bases, so that the final mixture has a sulfur content of less than 0.50% by mass.

[0008] Furthermore, fuels on board ships' tanks are generally stored there for long periods, several months, before being consumed. They must therefore have excellent storage stability at room temperature (25°C).

[0009] To ensure a continuous supply of fuel to the main engine, the fuel is generally pumped into a buffer tank (or settling tank). This is then centrifuged at a temperature of around 98°C to reduce the water and sediment content and continuously feed the day tank. This tank must ensure the supply of the engines for a period of 24 hours. In this tank, the fuel is generally at a temperature of between 75 and 98°C. Thus, marine fuels must also have good storage stability at high temperatures, ranging from 70 to 100°C, for at least 24 hours.

[0010] However, marine fuels based on low-sulfur heavy fuel oils containing distillation residues have been found to pose significant storage stability problems that are not encountered with conventional fuels. When stored for several months in ship tanks, they give rise to accelerated sediment formation and precipitation. In the day tank, high temperatures further accelerate this phenomenon, and sedimentation phenomena are also observed there despite the short residence time of the fuel in this tank.

[0011] The sediments that form in marine fuels based on low-sulfur heavy fuel oils are formed of hydrocarbons with very high molecular weights and very low hydrogen content. They are typically made up of polyaromatic compounds, which correspond to particular asphaltenes, different from the asphaltenes naturally present in crude oils and non-hydrotreated distillation residues. Indeed, the hydrotreatments and / or extensive cracking undergone by distillation residues to significantly lower their sulfur contents also transform the asphaltenes, by removing the substituents from the aromatic nuclei, which leads to the formation of compounds that are much less soluble in the petroleum environment and which precipitate in the form of sediments.This problem is particularly important in the case of fuels comprising bases consisting of visbroken residues, which are residues resulting from the high distillation of crude oils and which have also undergone at least one thermal cracking in order to lower their viscosity.

[0012] These sediment formations pose several problems. The sediments settle and accumulate in the ship's tanks, reducing the volume available for fuel storage. They increase the volume of "sludge" that must be removed by the centrifuges upstream of the engine and cause problems with filter clogging and injector plugging in the fuel distribution system.

[0013] Application EP 3 835 392 proposes, in order to improve the storage stability of marine fuel compositions with a sulphur content of less than 0.50% by mass, to use a combination of additives consisting of:

[0014] (A) a carboxylic acid or anhydride substituted by a polyalkenyl group, and

[0015] (B) a metallic detergent selected from metallic salts of substituted hydroxybenzoates or substituted sulfonates, their mixtures and their complexes, with a mass ratio of the respective amounts of (A) and (B) in the range from 20:1 to 1:20.

[0016] The use of modified alkylphenol-aldehyde resins to improve the stability of fuel compositions is also known, as described in patent application WO 2014 / 173844. The objectives pursued in this document are to improve the chemical stability of the composition (more precisely its stability to oxidation, which is problematic in particular for fuels containing substantial contents of vegetable, animal oils and / or their esters) as well as its stability during storage at low temperatures (i.e. to prevent precipitation of waxes and paraffins which occurs when the composition is stored at temperatures below zero degrees).

[0017] Patent application WO 2016 / 162392 also describes the use of modified alkylphenol-aldehyde resins as an asphaltene dispersing additive in a crude oil (i.e. crude oil) or in a crude oil-derived product selected from bituminous binders, bituminous coatings and asphalts.

[0018] These documents do not address the problem of physical stability during storage, both at ambient temperature and over long periods, and at elevated temperatures, of low-sulfur marine fuels based on visbroken residues. They do not include any information on the control of the particular phenomenon of sedimentation which occurs in this type of specific fuel.

[0019] Continuing its research into the development of low-sulfur marine fuel formulations, the Applicant discovered that the incorporation of a particular additive consisting of a modified alkylphenol-aldehyde resin as defined below made it possible to resolve the problems set out above.

[0020] The present invention therefore relates to a liquid marine fuel composition whose sulfur content is less than or equal to 0.50% by mass, relative to the total mass of the composition, and which comprises:

[0021] (1) at least one base consisting of a visbroken residue from a crude oil, and

[0022] (2) at least 100 ppm by mass, relative to the total mass of the composition, of one or more additives chosen from modified alkylphenol-aldehyde resins obtainable by Mannich reaction of an alkylphenol-aldehyde condensation resin with at least one aldehyde and / or a ketone having from 1 to 8 carbon atoms and at least one hydrocarbon compound having from 1 to 30 carbon atoms and comprising at least one alkylpolyamine group, said alkylphenol-aldehyde condensation resin itself being obtainable by condensation:

[0023] • at least one alkylphenol substituted by at least one alkyl group, linear or branched, having from 1 to 30 carbon atoms, with

[0024] • at least one aldehyde and / or ketone having from 1 to 8 carbon atoms.

[0025] The presence of the modified alkylphenol-aldehyde resin makes it possible to effectively control sediment deposits in low-sulfur marine fuels containing visbroken residues. The fuels according to the invention thus exhibit a physical storage stability of several months at room temperature, and at least two days at elevated temperature (i.e. at a temperature between 70°C and 100°C).

[0026] The present invention also relates to the use of a modified alkylphenol-aldehyde resin as defined above as an additive in a liquid marine fuel, the sulfur content of which is less than or equal to 0.50% by mass.

[0027] Other objects, characteristics, aspects and advantages of the invention will appear even more clearly on reading the description and examples which follow.

[0028] In what follows, and unless otherwise indicated, the limits of a domain of values ​​are included in this domain, notably in the expressions: "between ... and ...", "in the range from ... to ...", and "ranging from ... to ...".

[0029] Furthermore, the expressions "at least one" and "at least" used in this description are respectively equivalent to the expressions "one or more" and "greater than or equal to".

[0030] Finally, in a manner known per se, a CN compound is a compound containing N carbon atoms in its chemical structure.

[0031] The resin (2)

[0032] The modified alkylphenol-aldehyde resin(s) used in the present invention is (are) capable of being obtained by Mannich reaction of an alkylphenol-aldehyde condensation resin with

[0033] - at least one aldehyde and / or ketone having from 1 to 8 carbon atoms, and

[0034] - at least one hydrocarbon compound having from 1 to 30 carbon atoms and comprising at least one alkylpolyamine group.

[0035] The said alkylphenol-aldehyde condensation resin is itself capable of being obtained by condensation:

[0036] • at least one alkylphenol substituted by at least one alkyl group, linear or branched, having from 1 to 30 carbon atoms, with • at least one aldehyde and / or a ketone having from 1 to 8 carbon atoms.

[0037] According to a preferred embodiment, the modified alkylphenol-aldehyde resin(s) is (are) capable of being obtained by Mannich reaction of an alkylphenol-aldehyde condensation resin with

[0038] - at least one aldehyde and / or ketone having from 1 to 4 carbon atoms, and

[0039] - at least one hydrocarbon compound having from 4 to 30 carbon atoms and comprising at least one alkylpolyamine group, said alkylphenol-aldehyde condensation resin itself being capable of being obtained by condensation:

[0040] • at least one mono-alkylphenol substituted by at least one alkyl group, linear or branched, having from 1 to 30 carbon atoms, with

[0041] • at least one aldehyde and / or ketone having 1 to 4 carbon atoms.

[0042] The alkylphenol-aldehyde condensation resin can be chosen from any resin of this type already known and in particular those described in documents EP857776 and EP 1584673.

[0043] The modified alkylphenol-aldehyde resin according to the invention is advantageously capable of being obtained from at least one para-substituted alkylphenol. Para-nonylphenol is preferably used.

[0044] According to a preferred embodiment, the average number of phenolic nuclei per molecule of nonylphenol-aldehyde resin is between 6 and 25, preferably between 8 and 17, and even more preferably between 9 and 16.

[0045] The number of phenolic nuclei can be determined by nuclear magnetic resonance (NMR) or gel permeation chromatography (GPC).

[0046] Advantageously, the modified alkylphenol-aldehyde resin is obtained from the same aldehyde or the same ketone as said alkylphenol-aldehyde condensation resin.

[0047] According to a preferred embodiment, the modified alkylphenol-aldehyde resin is capable of being obtained from at least one aldehyde and / or at least one ketone chosen from formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, 2-ethylhexanal, benzaldehyde and / or acetone. Preferably, the modified alkylphenol-aldehyde resin is capable of being obtained from at least one aldehyde, preferably from at least formaldehyde (also called methanal).

[0048] According to a particular embodiment, the modified alkylphenol-aldehyde resin is capable of being obtained from at least one alkylpolyamine having at least two groups chosen from primary amine and secondary amine groups. In particular, the alkylpolyamine is advantageously chosen from primary and / or secondary polyamines substituted by, respectively, one or two alkyl groups preferably comprising from 12 to 24 carbon atoms, more preferably from 12 to 22 carbon atoms.

[0049] According to a preferred embodiment, the modified alkylphenol-aldehyde resin is capable of being obtained from at least one alkylpolyamine having at least two amine groups, and preferably at least three amine groups.

[0050] According to a preferred embodiment, the modified alkylphenol-aldehyde resin is capable of being obtained from at least one alkylpolyamine comprising a fatty chain having from 12 to 24 carbon atoms, preferably from 12 to 22 carbon atoms.

[0051] According to a particularly preferred embodiment, the modified alkylphenol-aldehyde resin is capable of being obtained from at least one alkylpolyamine having at least two amine groups, preferably at least three amine groups, and comprising a fatty chain having from 12 to 24 carbon atoms, preferably from 12 to 22 carbon atoms.

[0052] Commercial alkylpolyamines are generally not pure compounds but mixtures. Suitable commercially available alkylpolyamines include fatty chain alkylpolyamines marketed under the names Trinoram®, Duomeen®, Dinoram®, Triameen®, Armeen®, Polyram®, Lilamin® and Cemulcat®. A preferred example is TrinoramOS, which is a tallow dipropylenetriamine, also known as N-(Tallowalkyl)dipropylenetriamine (CAS 61791-57-9).

[0053] Preferably, the total content of the modified alkylphenol-aldehyde resin(s) is in the range from 100 to 4000 ppm by mass, preferably from 200 to 3000 ppm by mass, more preferably from 300 to 2000 ppm by mass, better still from 350 to 1500 ppm by mass, and better still from 700 to 1200 ppm by mass, relative to the total mass of the composition.

[0054] The base (1)

[0055] The marine fuel composition comprises one or more bases ( 1 ) consisting of a visbroken residue from a crude oil.

[0056] As is well known in itself, the distillation of crude oil is a refining process which consists of separating the different fractions in an industrial distillation column (or distillation tower) where each level operates at a temperature corresponding to a range of boiling temperatures of specific hydrocarbons.

[0057] Thus, each level of the distillation tower allows a specific product to be recovered: light hydrocarbons (such as butane, propane, light gasolines and naphthas) are collected in the upper part of the tower, intermediate hydrocarbons (heavy gasolines, kerosenes and diesels) are recovered by side draw-off, and the heaviest hydrocarbons are collected at the bottom of the distillation tower.

[0058] These heavy hydrocarbon products, collected at the bottom of a distillation column, are designated by those skilled in the art by the term residue.

[0059] A distinction is made between atmospheric residues, from a distillation column operating at atmospheric pressure, and vacuum residues, from a distillation column operating at a pressure lower than atmospheric pressure (vacuum distillation allows the boiling temperatures of the various constituents of the mixture to be distilled to be lowered, which thus reduces the risks of thermal degradation of the hydrocarbons).

[0060] The base(s) (1) used in the composition according to the invention consist of visbroken residues, that is to say residues which have undergone at least one thermal cracking treatment (visbreaking).

[0061] According to a preferred embodiment, the base (1) consists of a visbroken vacuum distillation residue.

[0062] The composition according to the invention may contain a mixture of bases (1), that is to say a mixture of different visbroken residues originating for example from the distillation of different crude oils.

[0063] The base (1) advantageously has a sulfur content of less than or equal to 0.70% by mass, relative to the total mass of said base. Preferably, its sulfur content is less than or equal to 0.60% by mass, more preferably less than or equal to 0.50% by mass relative to the total mass of said base. In a manner known per se, the sulfur content of the base (1) can be determined by the method described in standard ASTM D2622-21.

[0064] The fuel composition according to the invention typically contains a total quantity of at least 50% by mass, relative to its total mass, of base(s) ( 1 ) consisting of visbroken residue. This content is preferably at least 60% by mass, more preferably at least 70% by mass and better still at least 90% by mass.

[0065] Fuel composition

[0066] By liquid is meant that the composition according to the invention is in liquid form at room temperature (25°C) and atmospheric pressure (1,013. 10 5 Pa) .

[0067] The marine fuel composition according to the invention has a sulfur content of less than or equal to 0.50% by mass, relative to the total mass of said composition.

[0068] Preferably, its sulfur content is less than or equal to 0.50% by mass, more preferably less than or equal to 0.40% by mass, and better still less than or equal to 0.30% by mass, relative to the total mass of said composition. In a manner known per se, the sulfur content of the base (1) can be determined by the method described in standard ASTM D2622-21.

[0069] The composition according to the invention advantageously complies with the specifications of standard IS O 8217:2017, relating to class F fuels for the navy.

[0070] The composition according to the invention may also comprise one or more additional bases, different from the base(s) (1) consisting of visbroken residue(s).

[0071] It may, for example, comprise one or more additional bases consisting of an atmospheric distillation residue and / or a vacuum distillation residue. These bases may have undergone one or more hydrotreatments such as hydrocracking or hydrodesulfurization.

[0072] It may also further comprise one or more fluxes, i.e. one or more bases with a viscosity substantially lower than that of the residues. Examples include petroleum distillation cuts, such as diesel, middle distillates, and light fuels. These bases have generally undergone one or more hydrotreatments, such as hydrodesulfurization.

[0073] These additional bases, when present, represent a lower content than the base(s) (1). Typically, their content is less than 50% by mass, preferably less than or equal to 40% by mass, better still less than or equal to 30% by mass, relative to the total mass of the composition.

[0074] The composition according to the invention also complies with the specifications of the IMO 2020 regulations.

[0075] In addition to the resin(s) described above, the fuel composition may contain one or more additional additives, different from said resins (2) described above.

[0076] These additional additives can be chosen from all the additives suitable for this type of fuel, as provided for in standard ISO 8217:2017, chapter 5. These additives can be chosen, in a non-limiting manner, from detergent additives, demulsifying agents, corrosion inhibiting agents, cold resistance additives, viscosity modifying agents, lubricant additives, combustion improving agents.

[0077] Among the additional additives, mention may be made in particular of: a) detergent and / or anti-corrosion additives, in particular (but not limited to) chosen from the group consisting of succinimides, alkenylsuccinimides, polyalkylamines, polyalkyl polyamines, polyetheramines; imidazolines; and quaternary ammonium salts derived from the above-mentioned compounds, b) lubrication additives or anti-wear agents, in particular (but not limited to) chosen from the group consisting of fatty acids and their ester or amide derivatives, in particular glycerol monooleate, and mono- and polycyclic carboxylic acid derivatives; c) crystallization modifying additives, paraffin deposit inhibiting additives, pour point lowering additives; low temperature rheology modifiers such as ethylene / vinyl acetate (EVA) and / or ethylene / vinyl propionate (EVP) copolymers,ethylene / vinyl acetate / vinyl versatate (EA / AA / EOVA) terpolymers; ethylene / vinyl acetate / alkyl acrylate terpolymers; graft-modified EVA copolymers; polyacrylates; acrylate / vinyl acetate / maleic anhydride terpolymers; amidated maleic anhydride / alkyl(meth)acrylate copolymers obtainable by reaction of a maleic anhydride / alkyl(meth)acrylate copolymer and an alkylamine or polyalkylamine having a hydrocarbon chain of 4 to 30 carbon atoms, preferably of 12 to 24 carbon atoms; amidated alpha-olefin / maleic anhydride copolymers obtainable by reaction of an alpha-olefin / maleic anhydride copolymer and an alkylamine or polyalkylamine, the alpha-olefin being able to be chosen from C 10-C 50 alpha-olefins, preferably C 16-C 20 and the alkylamine or polyalkylamine advantageously having a hydrocarbon chain of 4 and 30 carbon atoms,preferably from 12 to 24 carbon atoms. Examples of terpolymers that may be mentioned are those described in EP01692196, W02009106743, W02009106744, US4758365 and US4178951. The compositions according to the invention are intended to power engines of any type of transport vessel, whether for example vessels intended for the transport of people, the transport of goods, the transport of bulk liquids such as tankers used to transport oil, gas, chemical products or liquids intended for human or animal consumption, or any other liquid.,

[0078] Uses

[0079] The invention also relates to the use of a modified alkylphenol-aldehyde resin (2) as defined above as an additive in a liquid marine fuel composition whose sulfur content is less than or equal to 0.50% by mass, relative to the total mass of the composition.

[0080] According to a first embodiment, the use according to the invention improves the storage stability of the marine fuel composition, in particular its storage stability at room temperature (25°C) and / or its storage stability at elevated temperature, greater than or equal to 70°C, preferably greater than or equal to 80°C. Preferably, the use according to the invention improves the storage stability of the marine fuel composition both at room temperature (25°C) and at elevated temperature.

[0081] According to a second embodiment, the use according to the invention reduces sediment deposits in the composition. In particular, the use according to the invention maintains the amount of sediment in the marine fuel composition, and in particular the amount of potential sediments called TSP, measured in accordance with ISO 10307-2A:2009, below 0.10% by mass.

[0082] The resin is advantageously used at a content in the range of 100 to 4000 ppm by mass, preferably 200 to 3000 ppm by mass, more preferably 300 to 2000 ppm by mass, better still 350 to 1500 ppm by mass, and better still 700 to 1200 ppm by mass, relative to the total mass of the composition.

[0083] Preferably, said marine fuel composition is as described above, and in particular is a composition known to those skilled in the art under the name VLSFO (from the English “Very Low Sulfur Fuel Oil”, which designates a fuel oil with a very low sulfur content).

[0084] According to a preferred embodiment, said marine fuel composition comprises at least one base (1) consisting of a visbroken residue from a crude oil, as described above.

[0085] The method

[0086] The invention finally relates to a method for reducing sediment deposits in a liquid marine fuel composition whose sulfur content is less than or equal to 0.50% by mass, relative to the total mass of the composition, consisting of adding to said composition a modified alkylphenol-aldehyde resin (2) as defined above.

[0087] The following examples are intended only to illustrate the invention, and should not be construed as limiting its scope.

[0088] EXAMPLES

[0089] Example 1: Synthesis of a modified alkylphenol-aldehyde resin

[0090] Step 1: In a first step, an alkylphenol-aldehyde condensation resin was prepared by condensation of para-nonylphenol and formaldehyde (for example according to the procedure described in EP857776). This resin has a viscosity at 50°C of between 1800 and 4800 mPa.s (viscosity measured at 50°C using a dynamic rheometer with a shear rate of 10 s 1 on the resin diluted with 30% by mass of aromatic solvent (Solvesso 150 ©)) •

[0091] Step 2: In a second step, the alkylphenol-aldehyde resin from the first step was modified by Mannich reaction by adding 2 molar equivalents of formaldehyde and 2 molar equivalents of tallow dipropylenetriamine, known under the name N-(Tallowalkyl)dipropylenetriamine and marketed for example under the name Trinoram S ®, compared to the alkylphenol-aldehyde resin from the first step.

[0092] The characteristics of the resin obtained at the end of step 2 are listed in table 1 below:

[0093] [Table 1]

[0094] (*) Viscosity at 50°C: measured on a resin diluted with 30% by mass of Solvesso 150® solvent, shear rate 10 s 1 , using a Haake RheoWin® rheometer.

[0095] (* *) Evaluation of the average number of phenolic nuclei per resin molecule or Nphe: measured by proton nuclear magnetic resonance.

[0096] Example 2: Storage stability test on a VLSFQ type marine fuel composition

[0097] The tests were carried out on a VLSFO (Very Low Sulfur Fuel Oil) type marine fuel composition, consisting of 70% by mass of visbroken residue, to which fluxing bases consisting of a heavy diesel cut and a middle distillate were added. This reference composition, called C0, has the following characteristics:

[0098] -Sulfur content (ASTM D2622): 0.492% by mass;

[0099] - Density at 15 °C (ISO 12185) = 953.5 kg / m 3 ;

[0100] - Viscosity at 50°C (ISO 3 104): < 500 mm 2 / s ;

[0101] - Asphaltene content: 5.1% by mass.

[0102] The modified alkylphenol-aldehyde resin described in Example 1 was incorporated at levels of 500 ppm by mass and 1000 ppm by mass into composition C0 so as to obtain the respective compositions C1 (500 ppm of resin active material) and C2 (1000 ppm of resin active material).

[0103] The storage stability of the three compositions C0, C1 and C2 was evaluated, immediately after preparation of the compositions (i.e. at T=0) and after 11 weeks of storage at room temperature (25°C) away from light (at T=11 weeks).

[0104] Stability was assessed according to the aging methods described in ISO 10307-2, followed by filtration described in ISO 10307-1. The two aging methods used are summarized as follows:

[0105] - the method for measuring total potential sediments (called TSP), according to ISO 10307-2A: the composition undergoes thermal aging at 100°C for a period of 24 hours before being filtered;

[0106] - the method for measuring total accelerated sediments (called TSA), according to ISO 10307-2B: the composition is mixed with n-hexadecane (solvent in which asphaltenes are insoluble and which can cause their precipitation) at a rate of 1ml per 10g, then undergoes thermal aging at 100°C for a period of 1h before being filtered.

[0107] The results obtained at T=0, expressed in terms of sediment content in accordance with ISO 10307 standards, are detailed in Table 2 below:

[0108] [Table 2]

[0109] The results obtained at T= 11 weeks, expressed in terms of sediment content in accordance with ISO 10307 standards, are detailed in Table 3 below: [Table 3]

[0110] The stability of compositions C1 and C2 according to the invention is much higher than that of the comparative composition CO. The above results demonstrate the very good effectiveness of the resin-based additive in preventing sediment deposits in the marine fuel composition.

Claims

CLAIMS 1. Liquid marine fuel composition with a sulfur content of less than or equal to 0.50% by mass, relative to the total mass of the composition, and which comprises: (1) at least one base consisting of a visbroken residue from a crude oil, and (2) at least 100 ppm by mass, relative to the total mass of the composition, of one or more additives chosen from modified alkylphenol-aldehyde resins obtainable by Mannich reaction of an alkylphenol-aldehyde condensation resin with at least one aldehyde and / or a ketone having from 1 to 8 carbon atoms and at least one hydrocarbon compound having from 1 to 30 carbon atoms and comprising at least one alkylpolyamine group, said alkylphenol-aldehyde condensation resin itself being obtainable by condensation: • at least one alkylphenol substituted by at least one alkyl group, linear or branched, having from 1 to 30 carbon atoms, with • at least one aldehyde and / or ketone having from 1 to 8 carbon atoms.

2. Composition according to the preceding claim, characterized in that the modified alkylphenol-aldehyde resin(s) is (are) capable of being obtained by Mannich reaction of an alkylphenol-aldehyde condensation resin with at least one aldehyde and / or a ketone having from 1 to 4 carbon atoms and at least one hydrocarbon compound having from 4 to 30 carbon atoms and comprising at least one alkylpolyamine group, said alkylphenol-aldehyde condensation resin itself being capable of being obtained by condensation: • at least one mono-alkylphenol substituted by at least one alkyl group, linear or branched, having from 1 to 30 carbon atoms, with • at least one aldehyde and / or ketone having 1 to 4 carbon atoms.

3. Composition according to any one of the preceding claims, characterized in that the alkylphenol-aldehyde resin modified is obtainable from at least one para-substituted alkylphenol, preferably para-nonylphenol.

4. Composition according to any one of the preceding claims, characterized in that the modified alkylphenol-aldehyde resin is capable of being obtained from at least one aldehyde and / or at least one ketone chosen from formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, 2-ethylhexanal, benzaldehyde and / or acetone, preferably from at least one aldehyde, more preferably from at least formaldehyde.

5. Composition according to any one of the preceding claims, characterized in that the modified alkylphenol-aldehyde resin is capable of being obtained from at least one alkylpolyamine having at least two amine groups, preferably at least three amine groups, and comprising a fatty chain having from 12 to 24 carbon atoms, preferably from 12 to 22 carbon atoms.

6. Composition according to any one of the preceding claims, characterized in that the total content of the modified alkylphenol-aldehyde resin(s) is in the range from 100 to 4000 ppm by mass, preferably from 200 to 3000 ppm by mass, more preferably from 300 to 2000 ppm by mass, better still from 350 to 1500 ppm by mass, and better still from 700 to 1200 ppm by mass, relative to the total mass of the composition.

7. Composition according to any one of the preceding claims, characterized in that the base (1) consists of a visbroken vacuum distillation residue.

8. Composition according to any one of the preceding claims, characterized in that it contains at least 50% by mass, relative to its total mass, of base(s) (1) consisting of a visbroken residue, preferably at least 60% by mass, more preferably at least 70% by mass, and better still at least 90% by mass.

9. Composition according to any one of the preceding claims, characterized in that its sulfur content is less than or equal to 0.40% by mass, preferably less than or equal to 0.30% by mass, relative to the total mass of the composition.

10. Use of a modified alkylphenol-aldehyde resin as defined in any one of claims 1 to 5 for improving the storage stability of a liquid marine fuel composition whose sulfur content is less than or equal to 0.50% by mass, relative to the total mass of the composition. 1 1. Use according to claim 10, for improving the storage stability of said marine fuel composition at room temperature (25°C) and / or its storage stability at a temperature greater than or equal to 70°C, preferably greater than or equal to 80°C.

12. Use of a modified alkylphenol-aldehyde resin as defined in any one of claims 1 to 5, for reducing sediment deposits in a liquid marine fuel composition whose sulfur content is less than or equal to 0.50% by mass, relative to the total mass of the composition.

13. Use according to claim 12, for maintaining the amount of sediment in the marine fuel composition, measured in accordance with IS O 10307-2A:2009, below 0.10% by mass.

14. Use according to any one of claims 10 to 13, characterized in that said marine fuel composition comprises at least one base (1) consisting of a visbroken residue from a crude oil.

15. Use according to any one of claims 10 to 14, characterized in that said resin is used at a content in the range from 100 to 4000 ppm by mass, preferably from 200 to 3000 ppm by mass, more preferably from 300 to 2000 ppm by mass, better still from 400 to 1500 ppm by mass, and better still from 700 to 1200 ppm by mass, relative to the total mass of the composition.

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