392 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 relates to the technical field of hydrodesulfurization, and discloses a hydrodesulfurization catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier, an active component loaded on the carrier and an optional auxiliary agent, the carrier comprises an inorganic heat-resistant matrix and a composite modified molecular sieve, the composite modified molecular sieve comprises a molecular sieve and a modified component, and the modified component is selected from at least one of VIB group metals; on the basis of the total amount of the composite modified molecular sieve, the content of the modified component in terms of oxide is 1-20wt%; based on the total amount of the composite modified molecular sieve, the total acid amount of the composite modified molecular sieve is 0.85-1.5 mmol NH3.g <-1 >; the mesopore volume of the composite modified molecular sieve accounts for 20-80% of the total pore volume; the active component comprises at least one of VIII group metals and at least one of VIB group metals. The catalyst has relatively high activity, direct desulfurization selectivity and relatively low reaction hydrogen consumption.

The present invention relates to a process for trapping mercaptans contained in a sulfur-containing hydrocarbon feedstock which is optionally partially desulfurized, resulting from a step of catalytic hydrodesulfurization, at a temperature of between 40° C. and 250° C., a pressure of between 0.2 MPa and 5 MPa, at an hourly space velocity, defined as the volume flow rate of feedstock at the inlet per volume of trapping mass, of between 0.1 h−1 and 50 h−1, in the presence of a trapping mass comprising an active phase based on at least one group VIII, IB or IIB metal, and a porous oxide or oxide mixture, the active metal of which has been activated beforehand by reduction and then passivated for the loading thereof by carbon dioxide treatment.

The invention provides a method for producing needle coke by using FCC slurry oil, and belongs to the technical field of needle coke, the production method comprises the steps of filtration separation, reduced pressure distillation, solvent extraction, hydrotreatment, carbonization coke formation and calcination; in hydrotreatment, a hydrogenation catalyst comprises a composite carrier and 10-45% by mass of active elements, and the active elements comprise Ni and Mo in a molar ratio of 1: (3-6), and at least one of Co, V or W; the composite carrier comprises the following components in percentage by mass: 50-80% of aluminum oxide and 20-50% of silicon oxide; the specific surface area of the composite carrier is 200-400m < 2 > / g, the composite carrier is of a hierarchical pore structure with micropores, mesopores and macropores, and the ratio of the pore volume of the micropores to the total pore volume is lt; the pore volume of mesopores accounts for 50-65% of the total pore volume, and the pore volume of macropores accounts for 30-50% of the total pore volume. The self-made hydrogenation catalyst is used for hydrotreating the raw materials, so that the activity of the catalyst and the selectivity of hydrodesulfurization can be effectively improved, and the desulfurization rate of the materials is obviously improved.

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 present invention relates to the technical field of heavy oil hydrodesulfurization, and discloses a hydrodesulfurization catalyst preparation process, which comprises: adding deionized water, a nickel source, a molybdenum source and a dispersant into a reaction container, stirring to obtain a metal solution, pouring into a container filled with gamma-Al2O3, impregnating, drying, and roasting to obtain the hydrodesulfurization catalyst. The dispersing agent contains a large number of nitrogen atoms and a plurality of carboxyl groups and hydroxyl groups, has very strong coordination chelation performance on nickel and molybdenum, improves the dispersity of nickel and molybdenum precursors, enables the nickel and molybdenum precursors to be uniformly impregnated into a gamma-Al2O3 carrier, and nickel oxide and molybdenum oxide are uniformly distributed in the gamma-Al2O3 carrier after calcination, so that the nickel and molybdenum oxide-modified gamma-Al2O3 composite material is prepared. The obtained hydrodesulfurization catalyst can expose more nickel-molybdenum catalytic active centers, effectively catalyzes and removes sulfur-containing substances such as thiophenes in straight-run diesel oil, shows a higher desulfurization rate, and improves the quality of oil products.

The invention discloses a method for producing low-sulfur and high-carbon-residue desulfurized residual oil, which is characterized in that the carbon residue value of a raw material is increased by increasing the slag doping ratio of raw oil, the hydrodesulfurization selectivity is improved by keeping high space velocity and adjusting the bed temperature of each reactor, and the properties of the raw material are improved by blending catalytic diesel oil. And a high-quality low-sulfur petroleum coke raw material is provided for a delayed coking device. According to the present invention, the hydrodesulfurization selectivity is improved by adjusting the raw material composition and the temperature of each reactor by using the existing device, such that the low-sulfur and high-carbon-residue desulfurization residual oil meeting the requirements can be produced, and the long-period operation of the device is not affected.

The invention discloses a combined processing technology of catalytically cracked gasoline, which belongs to the technical field of petrochemical engineering, and comprises the following steps: cutting the catalytically cracked gasoline into light component gasoline and heavy component gasoline; mixing the light-component gasoline with alkali liquor, continuously extracting with the alkali liquor, and collecting refined light-component gasoline; mixing the heavy-component gasoline with a hydrodesulfurization catalyst, carrying out hydrodesulfurization reaction, and collecting refined heavy-component gasoline; and mixing the refined light-component gasoline and the refined heavy-component gasoline to obtain a low-sulfur catalytically cracked gasoline product. The reinforcing material, the modified macroporous alumina, the organosilicon, the microcrystalline cellulose and the chitosan are mixed to form a cross-linked network structure aerogel as a hydrodesulfurization catalyst, stress generated under thermal shock of catalytically cracked gasoline can be absorbed and reduced, and the mechanical strength of the hydrodesulfurization catalyst is improved; the hydrodesulfurization catalyst has a large surface area and a porous structure, so that the specific surface area of the hydrodesulfurization catalyst is increased, and the desulfurization efficiency of the hydrodesulfurization catalyst is further improved.

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 utility model discloses a purification treatment device for coke oven gas. The device comprises a pre-purification device, a compression device and a hydrodesulfurization device, and the hydrodesulfurization device is arranged at the downstream of the pre-purification device and the compression device; the pre-purification device comprises a first pretreatment tower and an adsorption tower group, the adsorption tower group is arranged at the downstream of the first pretreatment tower, the first pretreatment tower is used for removing H2S in the coke oven gas, and the adsorption tower group is used for removing tar, dust, naphthalene and part of benzene in the coke oven gas; the compression device is used for pressurizing coke oven gas; the hydrodesulfurization device comprises a hydrogenation reaction assembly and desulfurization equipment, the desulfurization equipment is arranged at the downstream of the hydrogenation reaction assembly, the hydrogenation reaction assembly is used for converting organic sulfur in the coke oven gas into inorganic sulfur, and the desulfurization equipment is used for removing the inorganic sulfur in the coke oven gas treated by the hydrogenation reaction assembly. The device can be used for effectively removing impurities in coke oven gas, so that the coke oven gas meets the quality requirement on feed gas when DRI is produced by gas-based shaft furnace ironmaking.

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 discloses a hydrodesulfurization catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier, an organic hydrogenation active metal compound and an organic sulfur-containing compound, wherein the organic sulfur-containing compound is selected from at least one of benzothiophene sulfur-containing compounds, dibenzothiophene sulfur-containing compounds or naphthothiophene sulfur-containing compounds containing substituent groups and / or functional groups. The preparation method of the hydrodesulfurization catalyst comprises the following steps: preparing an impregnation liquid containing an organic sulfur-containing compound and an organic hydrogenation active metal compound; and impregnating a carrier with the impregnation liquid, and drying to obtain the catalyst. The catalyst is used in the hydrodesulfurization process of distillate oil, and the deep hydrodesulfurization activity can be obviously improved.

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.

A hydrogenation catalyst, and a preparation method therefor and a use thereof. The hydrogenation catalyst comprises a carrier, an active component, and N-graphdiyne. The active component is loaded on the carrier, and the N-graphdiyne is loaded on the carrier or is mixed in the carrier; the carrier comprises an aluminum oxide-lanthanum oxide-titanium oxide composite carrier; the active component is selected from at least two sulfides in metal M; the metal M is selected from group VIII and group VIB; and based on the total mass of the hydrogenation catalyst, the content of N-graphdiyne in the hydrogenation catalyst is 0.01-5 wt%. By using the aluminum oxide-lanthanum oxide-titanium oxide composite carrier as a composite carrier and introducing N-graphdiyne, the hydrogenation catalyst has high hydrodesulfurization and denitrification activity.

The invention provides a hydrodesulfurization and demetalization catalyst with defects on the surface and a preparation method of the hydrodesulfurization and demetalization catalyst, and is suitable for the field of catalyst preparation. The preparation method comprises the following steps: preparing a phosphorus-modified aluminum oxide compound; preparing the phosphorus-modified aluminum oxide compound into phosphorus-modified unit cell distortion pseudo-boehmite; the preparation method comprises the following steps: dipping phosphorus-modified cell-distorted pseudo-boehmite in a solution A containing an active metal component, carrying out second drying on the material, uniformly mixing the material obtained after second drying, pseudo-boehmite C and sesbania powder, adding a peptizing agent, carrying out kneading molding, and carrying out third drying and second roasting to obtain an alumina carrier; impregnating the alumina carrier with a solution B containing an active metal component, and carrying out fourth drying and third roasting to obtain a catalyst precursor; adding a second urea solution, carrying out third hydrothermal treatment, filtering, washing, fifth drying and fourth roasting to obtain the hydrodesulfurization and demetalization catalyst, the catalyst has the beneficial effects of high surface defect content and high activity.

The invention discloses a metal recovery method of a waste hydrodesulfurization catalyst containing vanadium and molybdenum, which comprises the following steps: grading ball milling activation: mixing the waste hydrodesulfurization catalyst and an inorganic salt auxiliary agent according to a preset mass ratio, adding the mixture into a ball milling tank, and carrying out ball milling on the mixed material by adopting grinding balls with different diameters according to different grading ratios, meanwhile, the ball-to-material ratio is controlled, and activated ball-milled powder is obtained; oxygen-enriched roasting: putting the activated ball-milled powder into a roasting furnace, and introducing oxidizing gas into the roasting furnace for roasting to obtain an oxygen-enriched roasted material; and low-temperature alkaline leaching is conducted, specifically, the oxygen-enriched roasting material is placed in an alkaline leaching medium according to the preset solid-to-liquid ratio, solid-liquid separation is conducted after the reaction is completed, and vanadium-molybdenum metal enrichment liquid is obtained. According to the method, grading ball milling and oxygen-enriched roasting enhanced oxidation processes are innovatively coupled, so that valence bonds of V-S-O or Mo-S-O in the waste HDS catalyst are broken, sufficient oxidation of low-valence V / Mo is realized, and efficient recovery of vanadium and molybdenum is realized at low temperature and normal pressure.

The invention provides an in-situ prevulcanization thermal cracking carbon black loaded bimetallic catalyst as well as a preparation method and application thereof, and belongs to the technical field of organic waste recycling. The bimetallic catalyst is prepared by taking a Zn-removed thermal cracking carbon material as a carrier, loading bimetallic metals of molybdenum and nickel by adopting an equivalent-volume impregnation method, and further performing in-situ activation and pre-vulcanization treatment on the bimetallic catalyst. According to the preparation method, the sulfur element in the thermal cracking carbon black is utilized to realize the in-situ pre-sulfuration process of the derivative hydrodesulfurization catalyst, so that the material cost required in the preparation process of the pre-sulfuration catalyst is controlled, the process complexity is reduced, the desulfurization efficiency can still be maintained at 85% or above after the obtained catalyst is recycled for three times, and the method is suitable for industrial production. A new thought is provided for high-value utilization of the thermal cracking carbon black and preparation of the carbon-based carrier presulfurization hydrodesulfurization catalyst.

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.

The invention discloses a catalytic slurry oil hydrogenation catalyst and a preparation method thereof. The catalyst comprises an alumina carrier containing an auxiliary agent, MoO3 and CoO, the carrier has bimodal pore size distribution, the smaller pore size is intensively distributed at 10-40nm, the pore volume of pore channels with the pore size of 10-40nm accounts for 20%-40% of the total pore volume, the larger pore size is intensively distributed at 150-400nm, and the pore volume of pore channels with the pore size of 150-400nm accounts for 30%-50% of the total pore volume. The catalyst disclosed by the invention is arranged between a hydrogenation protective agent and a hydrogenation desulfurizing agent in a catalytic cracking oil slurry hydrogenation reactor to play a role of connecting the previous part and the next part, so that primary removal of sulfur impurities in catalytic cracking oil slurry is realized, more deposits such as carbon deposits can be accommodated, and the running period of a device is prolonged.

The present invention relates to a process for producing special oil raw materials from heavy fuel oil; the present invention combines fixed-bed hydrogenation, delayed coking, hydrorefining and atmospheric and vacuum distillation processes, with a simple process flow and low investment; a steam generator is provided at the bottom of the coking fractionation tower of the present invention, and the bottom temperature of the tower is controlled by heat exchange while generating steam; alternatively, the atmospheric and vacuum distillation fraction products can be used to exchange heat with the residue fixed-bed hydrogenation raw materials to meet the demand for raw material preheating and reduce energy consumption; during the sulfidation process of the present invention, the succinic acid / cobalt / ruthenium complex and phosphoric acid groups on the MCM-41 molecular sieve react with hydrogen sulfide to form a more active hydrodesulfurization active center, which can catalyze the hydrodesulfurization reaction of sulfides and improve the desulfurization efficiency.

A process for preparing a purified benzene composition from a crude hydrocarbon stream containing at least 10% by volume of benzene is provided. The process comprises subjecting the crude hydrocarbon stream and a further recycled benzene containing stream to a solvent-based extraction so as to produce a benzene enriched aromatic stream and a benzene depleted non-aromatic stream, subjecting the benzene enriched aromatic stream to a hydrodesulfurization so as to obtain a desulfurized aromatic stream, subjecting the desulfurized aromatic stream to a distillation producing a purified benzene stream and a further benzene containing stream having a benzene concentration of between less than 100% by weight and the azeotropic benzene concentration, and at least partially recycling the further benzene containing stream.

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 belongs to the technical field of carbon dioxide hydrogenation catalysts, and particularly relates to a preparation method of a Pt / CSAP-TiO2 / CeO2 coupled carbon dioxide capture hydrogenation methanol catalyst with high oxygen vacancy content. The hydrodesulfurization catalyst with high oxygen vacancy content is obtained after the water-soluble Pt is highly dispersed, dehydrated and carbonized by utilizing the adsorption effect of the super absorbent resin, the soluble TiCe is secondarily impregnated, and the hydrodesulfurization catalyst is dried and calcined, so that the reaction performance can be further improved, and the prepared catalyst belongs to a uniformly supported coupling carbon dioxide hydrogenation methanol preparation catalyst.

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 belongs to the field of efficient and clean utilization of coke-oven gas, and particularly relates to a process for preparing liquefied natural gas from coke-oven gas with a transformation methanation-free circulation loop. The process comprises the following steps: coke-oven gas is subjected to compression purification, hydrodesulfurization and wide temperature shift, then enters a methanation unit and passes through a plurality of methanation reactors connected in series, all carbon-containing compounds in shift gas are converted into methane, and methane-rich gas is subjected to cryogenic separation to obtain an LNG product. The process is simple, easy to operate, free of methanation recycle gas, good in process reliability, low in comprehensive energy consumption and large in operation flexibility, and the system is suitable for large-scale methanation production.

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.