173 results about "Hydrodesulfurization" patented technology

The application provides a method for grading diesel deep hydrodesulfurization catalysts, which comprises the following steps: loading catalysts containing AlPO4-5 phosphorus aluminum molecular sieves and catalysts containing ETS-10 titanium silicon molecular sieves in the upper and lower parts of a fixed bed hydrogenation reactor respectively according to a loading mass ratio of 1:3-3:1, so that diesel is subjected to hydrodesulfurization reaction through catalysts containing AlPO4-5 phosphorus aluminum molecular sieves first and then through catalysts containing ETS-10 titanium silicon molecular sieves; the carrier of the catalysts containing AlPO4-5 phosphorus aluminum molecular sieves comprises AlPO4-5 phosphorus aluminum molecular sieves and aluminum oxide powder, the carrier of the catalysts containing ETS-10 titanium silicon molecular sieves comprises ETS-10 titanium silicon molecular sieves and aluminum oxide powder, and the active components of the two kinds of catalysts respectively comprise a combination of two or three of nickel oxide, molybdenum oxide and cobalt oxide. The sulfur content of the hydrogenated diesel obtained through the method can be as low as 10 μg / g or below.

The invention discloses a preparation method of a hydrofining catalyst for petrochemical engineering. The preparation method comprises the following steps: step a, carrier pretreatment: putting an aluminum oxide precursor into a dilute nitric acid solution with the mass fraction of 1-5%, dipping for 2-4 hours, and drying at 120-150 DEG C for 3-6 hours; the comprehensive performance of the catalyst is remarkably improved by modifying the alumina carrier with phosphoric acid and optimizing an active component loading process; a gradient acid center is constructed on the surface of the carrier through phosphoric acid treatment to promote adsorption and dissociation of the sulfur / nitrogen-containing compound; the dispersion degree of the active phase is enhanced and high-temperature sintering is inhibited by a bimetal synergistic loading strategy; the pore structure evolution is effectively controlled by a segmented drying and stepped heating roasting process, a through type mesoporous network is formed, and the macromolecular diffusion efficiency is improved; the obtained catalyst is improved in activity in diesel oil hydrodesulfurization, improved in mechanical strength and prolonged in service life.

The application discloses a hydrodesulfurization catalyst and a preparation method and application thereof. The hydrodesulfurization catalyst comprises a carrier and a second active metal component; the carrier comprises a first active metal nitride, a first active metal carbide, boron oxide and aluminum oxide; wherein the molar ratio of the first active metal nitride to the first active metal carbide, in terms of the first active metal, is 1:0.15-0.25. The hydrodesulfurization catalyst has the characteristics of good macromolecular diffusion performance, strong desulfurization capacity and good carbon deposition resistance. The hydrodesulfurization catalyst is particularly suitable for a residual oil hydrodesulfurization treatment process and has good desulfurization activity and stability.

The invention relates to the technical field of catalysts, in particular to a desulfurization catalyst and application thereof in hydrodesulfurization. The desulfurization catalyst adopts a hollow core shell, a weak acid site is constructed on a shell surface, and a boron-containing polymerization network is formed through surface-initiated polymerization; and linear / branched polyethyleneimine complexation is used for synergistically introducing Ni and Mo, in-situ vulcanization is performed after inert atmosphere pretreatment, and a dispersed nickel molybdenum sulfide active phase and shallow and deep double-peak metal distribution are obtained. The structure inhibits excessive hydrogenation while ensuring diffusion and structural stability, promotes a direct desulfurization path, and shows high conversion and high selectivity to 4, 6-dimethyl dibenzothiophene. The catalyst has low hydrogen consumption, high aromatic hydrocarbon retention and cycling stability, and is suitable for deep desulfurization of diesel oil and preparation of ultralow-sulfur fuel.

The invention relates to the technical field of catalysts, in particular to a graphene-based desulfurization catalyst and a preparation method thereof. Graphene oxide is used as a carrier, an initiating group is introduced firstly, a short-brush amphoteric polymer gradient modification layer and a long-brush amphoteric polymer gradient modification layer are sequentially constructed through atom transfer radical polymerization, ammonium molybdate-urea complex deposition is fused, and uniform nucleation of a metal precursor is achieved. Two-stage vulcanization is adopted in the preparation process, the crystallization process of a precursor is controlled step by step at different temperatures, and the size and dispersity of a molybdenum disulfide sheet layer are optimized. The catalyst is high in conversion rate under a hydrodesulfurization model system, low in total sulfur of discharged materials, and excellent in activity retention rate after multiple cycles. The method can be widely applied to the field of fuel oil deep desulfurization, and the efficient and environment-friendly industrial catalysis requirement is met.

The invention relates to the technical field of hydrodesulfurization catalysts, and discloses a molecular sieve hydrodesulfurization catalyst and a preparation method thereof.Active Si-Cl bonds of maleate methyl dichlorosilane react with hydroxyl in an MCM-41 molecular sieve, then hydrolysis is conducted through sodium hydroxide, and therefore a large number of carboxyl groups are grafted in the molecular sieve; carboxyl can form a strong coordination effect with metal ions such as nickel and the like, so that nickel and molybdenum are uniformly adsorbed into a matrix of the molecular sieve, a nickel-molybdenum oxide catalytic active center is uniformly generated in the molecular sieve through high-temperature roasting, catalytic sites are not easy to agglomerate, the dispersity is good, and the catalytic activity is stable. The catalyst can effectively perform hydrogenation reaction on sulfur-containing substances such as thiophenes in straight-run diesel oil, and has higher desulfurization rate. The catalyst has good practical application in the aspects of oil hydrodesulfurization catalysis and the like.

The invention relates to the technical field of hydrogenation catalysts, and discloses a coal-based cracking C9 + component hydrogenation catalyst and a preparation method and application thereof. The method comprises the following steps: (1) carrying out cocurrent-flow coprecipitation on pseudo-boehmite, mesoporous carbon and a precipitator to obtain precipitated slurry; sequentially aging the obtained precipitate slurry, and separating out a solid phase to obtain modified pseudo-boehmite; (2) mixing, kneading and molding the modified pseudo-boehmite obtained in the step (1), kaolin, an adhesive and an extrusion aid, and then performing first drying and first roasting to obtain a composite carrier; and (3) preparing an impregnation liquid containing a fluoride salt, a first active metal salt and a second active metal salt, impregnating the composite carrier in the impregnation liquid by adopting a rotary spray impregnation mode, introducing gas into the impregnation reactor after impregnation is completed, and then carrying out second drying and second roasting. According to the technical scheme, the catalyst has high catalytic activity, carbon deposition resistance and high hydrodesulfurization activity.

The invention belongs to the technical field of hydrometallurgy, and relates to a method for separating out metal and recycling molybdenum from a waste hydrodesulfurization catalyst by utilizing a low-dielectric-constant solvent. According to the method, nickel and aluminum are separated out through the metal precipitation agent, molybdenum extraction is carried out under the condition that pH is not adjusted, the requirement for the molybdenum extraction recovery rate and the separation effect of nickel, aluminum and molybdenum in the solution in the past is eliminated, residual metal in the solution enters the next cycle process, total recovery of metal molybdenum is achieved through total circulation, and the recovery rate of molybdenum is increased. And finally, loss-free recovery of metal molybdenum is realized, and loss of inorganic acid and alkali is avoided.

This invention discloses a hydrodesulfurization catalyst and its preparation method and application. The steps are as follows: (1) an organic polymer is modified with acid and then mixed with boehmite powder to obtain a first mixture; (2) an aqueous solution of amorphous silica-alumina and a heated organic polymer is mixed and spheroidized to obtain a first precursor; (3) a second precursor is prepared; (4) a second mixture is prepared; (5) a third precursor is prepared; (6) a support is prepared, and after introducing a hydrogenation active metal component, it is dried and calcined to obtain the hydrodesulfurization catalyst. The prepared catalyst has a non-uniform pore distribution structure, which not only gives it high impurity removal capacity, containment capacity and asphaltenes conversion capacity, but also reduces the sediment content in the generated oil. It is particularly suitable for the hydrotreating process of directly producing low-sulfur marine fuel oil from fluidized bed heavy oil.

This invention belongs to the field of petroleum processing technology, and specifically relates to a production apparatus and method for low-pour-point base oil for aviation hydraulic oil. The production apparatus and method for low-pour-point base oil for aviation hydraulic oil includes the following steps: Hydrorefining of the oil, where the feedstock oil undergoes hydrodesulfurization and dearomatization in a two-stage series process to produce hydrorefined oil with <1% aromatics and <1 mg / kg sulfur content; Fine fractionation of the oil, specifically: the hydrorefined oil is finely fractionated in a fractionation tower to obtain hydrorefined distillate oil at 230℃~280℃; Molecular sieve dewaxing, specifically: the 230℃~280℃ hydrorefined distillate oil is subjected to deep removal of n-alkanes using a 5A molecular sieve, lowering the oil's pour point to below -75℃, producing low-pour-point, low-aromatic aviation hydraulic oil base oil. This invention uses a combined process of "low-pressure hydrorefining-molecular sieve dewaxing" to produce a low-sulfur, low-aromatic, low-pour-point base oil with less than 1% aromatics. The production method has the advantages of low investment and ease of implementation.

The invention relates to a method for producing a needle coke raw material and a low-carbon olefin raw material, which comprises the following steps of: S1, extracting oil slurry from at least one layer of tower trays from the first layer to the fifth layer of tower trays from the tower bottom to the top of a main fractionating tower of a catalytic cracking device to obtain extracted oil slurry; carrying out purification treatment on the extracted oil slurry to obtain purified oil slurry; the total content of colloid and asphaltene in the purified slurry oil is less than 20wt%; s2, mixing the purified oil slurry with light cycle oil, feeding the mixed raw oil and hydrogen-containing gas into a hydrogenation device, and performing hydrodesulfurization reaction under the action of a hydrogenation catalyst to obtain a hydrogenation product; and S3, carrying out solvent extraction on the hydrogenation product to obtain extract oil and raffinate oil. According to the method provided by the invention, the feeding viscosity of a purification device is greatly reduced, the contents of colloid and asphaltene in the purified slurry oil are greatly reduced, and the generation of an aged intermediate phase is reduced; aromatic hydrocarbon and saturated hydrocarbon in hydrogenation products can be separated to the maximum extent through solvent extraction.

The invention discloses a fixed bed residual oil hydrodesulfurization catalyst carrier as well as a preparation method and application thereof, and belongs to the technical field of catalysts. According to the method, the water retention function of wet balls is improved by adding silochrom, so that the surfaces of extruded strips are dry and comfortable, and adhesion among particles is reduced; viscosity slow-release cellulose is combined, so that the viscosity of the kneaded material is further reduced, and the efficiency of the pelletizing process is improved; the water-soluble thermocuring polymer resin is added, so that the extrusion resistance of the wet bulb is improved, and the pore structure is improved; after the treatment, the strip-shaped surface extruded by the strip extruder is dry and comfortable, the viscidity is moderate, and the production continuity and efficiency of the pelletizing device are improved. After the carrier is prepared into a tooth spherical carrier, the tooth spherical carrier can be directly used as a hydrodesulfurization catalyst to be filled below the tangent line of a reactor, and can cope with larger raw material treatment load, slow down the rise of bed pressure drop and prolong the running time of a device.

The application discloses a silicon capturing agent, a preparation method and application thereof. The silicon capturing agent comprises an alumina carrier containing a microspherical cavity, pseudo-boehmite and an active component; the pseudo-boehmite is in-situ grown on the outer surface and the microspherical cavity of the silicon capturing agent; the active component is a group VIB metal sulfide and a group VIII metal sulfide, and the group VIB metal sulfide and the group VIII metal sulfide are loaded on the alumina carrier and the pseudo-boehmite; the particle morphology of the pseudo-boehmite is a velvet worm structure, and the size of the velvet worm particle is 80-350 nm; and the surface hydroxyl content of the silicon capturing agent is 1000-2000 mu mol / g. The silicon capturing agent has high silicon capacity, can effectively capture silicon in oil from processes such as delayed coking, prevents the silicon poisoning and deactivation of a main catalyst, and has high hydrogenation desulfurization, denitrification and olefin saturation activities.

This invention discloses a method for hydrotreating catalytic cracking slurry. A fixed-bed hydrotreating process is employed, comprising: in the presence of hydrogen, the catalytic cracking slurry sequentially contacts a hydrotreating protectant, a hydrotreating transition catalyst, and a hydrodesulfurization catalyst to undergo a hydrotreating reaction, yielding hydrotreated oil. The hydrotreating protectant comprises an alumina support with a most probable pore size of 40–100 nm, molybdenum oxide, and cobalt oxide. The hydrotreating transition catalyst comprises an alumina support containing additives and MoO3 and CoO. The support has a bimodal pore size distribution, with smaller pores concentrated in the 10–40 nm range and larger pores concentrated in the 150–400 nm range. This method eliminates the diffusion resistance during the adsorption and reaction of large molecules on the catalyst surface during the hydrotreating of catalytic cracking slurry, increases the capacity for more deposits such as coke, extends the operating cycle of the unit, and facilitates hydrodesulfurization and other reactions. It also increases the content of tricyclic and tetracyclic aromatics in the hydrotreated oil, making it a high-quality feedstock for needle coke production.

A method can be employed to regulate and stably operate a steam reforming system that is operated by steam reforming, that has a capacity utilization level that can be regulated, and that comprises a steam reformer, a hydrogenating and desulfurizing unit that is positioned upstream of the steam reformer and is configured for feedstock desulfurization, and a firing unit of the steam reformer. According to the method, a mandated capacity utilization level for the steam reforming system is established with automated regulation of the following continuously monitored parameter ratios: a hydrogen-to-feedstock ratio in the hydrogenating and desulfurizing unit, a steam-to-carbon ratio in the steam reformer, and a fuel-to-air ratio in the firing unit of the steam reformer.

The present invention relates to a process for the production of hydrogen, comprising steps of hydrodesulfurization, reforming in a reforming section comprising a gas-heated reformer and an autothermal reformer, a water-gas shift step, a carbon dioxide separation step, and a hydrogen purification step. The hydropurification step produces a hydrocarbon-containing stream that is split, one portion of which is used as a fuel gas stream supplied to one or more combustion heaters used to heat one or more process streams in the process, and the other portion of which is split into a hydrodesulfurization recycle stream that is compressed and used in a hydrodesulfurization unit, and a process recycle stream that is returned to the process. The present invention also relates to a chemical plant configured to carry out the process.

Methods and systems for improving operation of a gasoline desulfurization system may include receiving gasoline blending pool data, the gasoline blending pool data indicative of one or more of a sulfur concentration, a current inventory, or an octane number of each current component of a gasoline blending pool. A machine learning model generates a light naphtha sulfur target for a light naphtha produced from a selective hydrogenation reactor of a gasoline desulfurization system based on the gasoline blending pool data and generates a heavy naphtha sulfur target for a desulfurized heavy naphtha produced from a hydrodesulfurization reactor of the gasoline desulfurization system based on the gasoline blending pool data. The machine learning model may be trained on historical data of the gasoline blending pool and historical data of operating parameters, resulting product attributes, and composition from the gasoline desulfurization system, including sulfur concentration and octane number.

The utility model provides a kind of extruder device for diesel hydrogen desulfurization catalyst production, it belongs to extruder technical field, it includes fixed shell and cylinder, the fixed shell side is connected with cylinder and penetrates, the output end of two cylinder is fixedly connected with transmission plug, the other side of the fixed shell is connected with communicating hole and penetrates, the top of the fixed shell is fixedly connected with support frame, the top of the support frame is fixedly connected with receiving hopper, the bottom of the receiving hopper is connected with conveying pipe and penetrates, the outer surface of the conveying pipe is connected with electric throttle valve and penetrates.The utility model adds control screen and electric heating tube to fixed shell, control screen is delivered to the inside of electric heating tube, when electric heating tube inside resistance wire via electric heating effect, heat is continuously delivered to the inside of fixed shell to heat catalyst, prevent catalyst freezing and affect catalyst extrusion effect.

The invention belongs to the technical field of aviation fuel, and particularly relates to a C11-C16 cycloalkane component as well as a preparation method, a preparation device and application thereof. The preparation method of the C11-C16 cycloalkane component provided by the invention comprises the following steps: carrying out a hydrodesulfurization and denitrification reaction on a coal tar light fraction and a hydrodesulfurization and denitrification catalyst in a hydrogen-containing atmosphere to obtain refined light oil; carrying out alkylation reaction on the refined light oil, naphtha and a hydrogen type molecular sieve catalyst to obtain an aryl mixture; carrying out hydrogenation reaction on the aryl mixture and a hydrogenation catalyst in a hydrogen-containing atmosphere to obtain a cycloalkane mixture; and the cycloalkane mixture is subjected to fractionation, such that the C11-C16 cycloalkane component is obtained. According to the preparation method provided by the invention, the coal tar light fraction and naphtha are taken as raw materials and can be directionally converted into C11-C16 cycloalkane components, so that the novel aviation fuel with high density and calorific value is prepared.

To provide a hydrodesulfurization method for a light oil fraction including a straight-run light oil and a cracked light oil, that can increase a hydrodesulfurization treatment capacity of the cracked light oil.SOLUTION: A hydrodesulfurization method for a light oil fraction comprises: starting a hydrodesulfurization reaction of straight-run light oil by supplying straight-run light oil to a hydrodesulfurization device; and stopping the hydrodesulfurization reaction of the straight-run light oil and starting the hydrodesulfurization reaction of a mixed oil of the straight-run light oil and a cracked light oil by further supplying the cracked light oil to the hydrodesulfurization device after a reaction t1 day has passed, wherein a content of the cracked light oil in the mixed oil is 0.5 to 30 vol.%, t1 satisfies 0.1×ttotal≤t1≤0.85×ttotal when a reaction completion time of the hydrodesulfurization reaction of the light oil fraction is a time when ttotal reaction days have elapsed, and a reaction temperature is equal to or lower than an upper limit temperature for use of the hydrodesulfurization device during an entire reaction period from 0 to ttotal days.SELECTED DRAWING: None

The application discloses a catalytic gasoline hydrofining catalyst and a preparation method thereof. The catalyst comprises a carrier of molybdenum, cobalt, phosphorus and a cobalt-manganese solid solution, and the amount of the phosphorus in the form of its oxide is 0.3-7 parts by weight based on 100 parts of the hydrofining catalyst. The carrier is a meso-macroporous alumina carrier, the total specific surface area of the carrier is 150-300 m 2 / g, and the total pore volume is 0.8-1.4 mL / g. The amount of the cobalt-manganese solid solution in the carrier is 0.5-15 parts by weight based on 100 parts of the carrier, and the balance is meso-macroporous alumina. The catalytic gasoline hydrofining catalyst is particularly suitable for selective hydrodesulfurization and denitrification of catalytic cracking (FCC) gasoline, and the hydrofining catalyst has the characteristics of high reaction activity and good selectivity.

The invention discloses a preparation method of a gasoline selective hydrogenation catalyst, which comprises the following steps: (1) adding a niobium-containing precursor into bottom water of a reactor, adding an aluminum salt solution and a precipitant in a parallel flow manner, carrying out gelling reaction, pulping molybdenum trioxide after gelling, carrying out aging reaction, and washing, filtering and drying an aging product to obtain modified alumina dry glue powder; (2) uniformly mixing the modified alumina dry glue powder, a peptizing agent and an extrusion aid, carrying out extrusion molding, drying and roasting to obtain a carrier, and carrying out vulcanization treatment; (3) carrying out saturated impregnation on the carrier vulcanized in the step (2) by using liquid olefin, and then carrying out closed heat treatment under a CO2 atmosphere condition with a certain concentration; and (4) impregnating the heat-treated material obtained in the step (3) with an impregnation liquid containing active metal Co, drying, roasting and vulcanizing to obtain the hydrodesulfurization catalyst. The catalyst disclosed by the invention has relatively high desulfurization activity and selectivity when being applied to a gasoline selective hydrogenation process.

The present invention discloses a residual oil hydrodesulfurization catalyst and a preparation method and application thereof, the residual oil hydrodesulfurization catalyst comprises an active metal component, an auxiliary agent metal component and a carrier, the active metal is one or more of VIB group metal and / or VIII group metal, the auxiliary agent metal is iron and / or zirconium, and the carrier is a carrier. Wherein the active metal and the auxiliary metal exist on the carrier in an oxide form, and the carrier is aluminum oxide. The preparation method comprises the following steps: (1) preparing a first material flow; (2) preparing a first catalyst precursor, (3) preparing a second stream; (4) preparing a second catalyst precursor; and (5) carrying out heat treatment on the second catalyst precursor, introducing an active metal component, and further drying and roasting to obtain the hydrodesulfurization catalyst. The hydrodesulfurization catalyst provided by the invention has good metal containing capacity and asphaltene conversion capacity while having high desulfurization performance, and can greatly reduce the content of sediments in generated oil.

The invention belongs to the technical field of hydrodesulfurization agents, and particularly relates to a hydrodesulfurization agent and a preparation method and application thereof. The preparation method of the hydrodesulfurization agent provided by the invention comprises the following steps: mixing a polyhydroxy organic polymer carbon source, lanthanum salt and water, and then carrying out hydrothermal polymerization reaction to obtain an adsorption solution; melamine sponge is soaked in the adsorption solution, the melamine sponge is taken out after soaking is completed, drying is conducted, first carbonization treatment is conducted in a fixed bed, and a primary adsorption doped carbon material is obtained; dipping the primary adsorption doped carbon material in the adsorption solution, taking out the primary adsorption doped carbon material after dipping, drying, and performing secondary carbonization treatment in a fixed bed to obtain a secondary adsorption doped carbon material; and mixing the secondary adsorption doped carbon material with a sulfur source, roasting, and then carrying out microwave regeneration in an oxygen-containing atmosphere to obtain the hydrodesulfurization agent. The prepared hydrodesulfurization agent is high in mechanical strength and high in sulfur capacity.

The invention relates to a coated catalyst as well as a preparation method and application thereof. The catalyst comprises a core-layer catalyst and a SiO2 layer coated on the surface of the core-layer catalyst, the core-layer catalyst comprises an alumina carrier as well as an active component and an auxiliary component which are loaded on the alumina carrier; the auxiliary agent component comprises alkali metal and / or alkaline earth metal; the active component comprises at least one group VIB metal; the content of the group VIB metal is 8-25wt% in terms of oxide and on the basis of the total weight of the core-layer catalyst. According to the invention, tetracyclic aromatic hydrocarbon is limited from entering the core layer catalyst by using the screening function of the SiO2 layer, so that the retention rate of tetracyclic aromatic hydrocarbon is improved while the desulfurization activity is improved; meanwhile, the modification of the alkali metal and / or alkaline earth metal is beneficial to enhancing the interaction between the carrier and the active component, and the dispersity of the active component in the hydrogenation catalyst is improved, so that the hydrodesulfurization activity of the catalyst is further improved.

The invention discloses a preparation method of a gasoline selective hydrogenation catalyst, which comprises the following steps: (1) impregnating a carrier with an impregnation liquid containing active metals Mo and Co, and drying to obtain a first-stage hydrodesulfurization catalyst; (2) impregnating the first-stage hydrodesulfurization catalyst obtained in the step (1) with an impregnation liquid containing alkali metal and / or alkaline earth metal, and drying to obtain a second-stage hydrodesulfurization catalyst; and (3) roasting the second-stage hydrodesulfurization catalyst obtained in the step (2) under a CO and / or CO2 atmosphere condition with a certain concentration to obtain a finished product catalyst. The catalyst prepared by the method disclosed by the invention well inhibits an olefin saturation active center, is smaller in octane number loss when being applied to a gasoline selective hydrogenation process, and has higher desulfurization activity and selectivity.

The invention provides a passivation method of a sulfuration type catalytically cracked gasoline hydrodesulfurization catalyst, a passivated catalyst and application thereof, and the passivation method comprises the following steps: dissolving an organic peroxide in an organic solvent to form a passivation solution; under the condition of oxygen isolation, adding the sulfuration type catalytically cracked gasoline hydrodesulfurization catalyst into the passivation solution, and carrying out passivation reaction, so as to obtain the passivated catalyst after the passivation reaction is finished. The passivation method provided by the invention has the advantages of simple process and strong controllability, can improve the desulfurization activity of the sulfuration type catalytically cracked gasoline hydrodesulfurization catalyst, and solves the problems of uncontrollable passivation effect, complex startup pretreatment, low active center utilization rate and the like of the existing ex-situ passivation catalyst.

The application discloses a preparation method of a phosphide hydrofining catalyst, and comprises the following contents: (1) adding a W-Ni-Al solution into a reaction tank, dropping a mixed precipitant into the reaction tank to carry out a pH value increasing gelation reaction, adding a nickel-containing solution every time, adding a phosphate compound at the beginning of the second last time of increasing, and obtaining a slurry after the gelation reaction is finished; wherein the mixed precipitant is a mixture of ammonia and a sodium phosphate solution; (2) carrying out at least two times of "pH value decreasing aging" on the slurry, and obtaining an aging product after the aging is finished; and (3) preparing the aging product into the phosphide hydrofining catalyst. The catalyst prepared by the method has high surface phosphide content, and is suitable for application in diesel fraction ultra-deep hydrodesulfurization and denitrification reactions.

This invention discloses a method for deep desulfurization of liquefied petroleum gas (LPG), comprising the following: (1) LPG feedstock first enters an alcohol amine absorption tower to remove hydrogen sulfide; (2) LPG and hydrogen gas, after hydrogen sulfide removal, enter a hydrodesulfurization reactor from the top of the reactor and undergo hydrodesulfurization reaction under the action of LPG desulfurization catalyst; (3) After desulfurization, LPG enters a separator for gas-liquid separation, the separated hydrogen gas is recycled, and the liquid phase enters an alcohol amine absorption tower to absorb the sulfides produced by the reaction, and enters the upper end of the alcohol amine absorption tower to obtain refined LPG product; wherein, the LPG desulfurization catalyst comprises a carrier and an active metal component, the carrier being graphene oxide-ZnO-Al2O3, wherein graphene oxide is distributed on the surface of zinc oxide and aluminum oxide; the mass ratio of zinc oxide is 20.0%~90.0%, and the content of graphene oxide is 0.1wt%~10.0wt%; the active metal component is CuO and / or NiO. The method of this invention can achieve deep desulfurization of liquefied petroleum gas under low temperature and low olefin saturation conditions.

The application discloses a kind of hydrofining catalyst and preparation method thereof, including transition metal phosphide and alumina;The transition metal phosphide is WP and Ni2P;Wherein the weight content of Ni2P in surface phase and the weight content of Ni2P in bulk phase are 2.5:1~7.0:1, and the weight content of WP in surface phase and the weight content of WP in bulk phase are 2.5:1~6.5:1.Preparation method is as follows: (1) first gelation reaction is carried out to multiple metal solution and precipitator, and first slurry is obtained;(2) first slurry, nickel-containing solution and precipitator are added to the gelation tank containing bottom water and phosphate compound to carry out second gelation reaction, and second slurry is obtained;(3) second slurry is subjected to multiple pH value aging, and one portion of sodium metaaluminate solution is added in each aging process, and third slurry is obtained;(4) third slurry is filtered, dried and formed to prepare the hydrofining catalyst.The catalyst has large surface active site density, and is suitable for application in diesel fraction ultra-deep hydrodesulfurization and denitrification reaction.