237 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 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 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 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.

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 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 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.

The invention relates to the technical field of petrochemical engineering, in particular to a method and device for increasing the yield of high-quality low-sulfur petroleum coke. The method comprises the following steps: carrying out hydrodesulfurization pretreatment on raw oil and a catalyst, carrying out heat treatment on an obtained liquid-solid component I, carrying out separation and extraction on an obtained liquid-solid component II, and carrying out coking treatment on an obtained coking raw material to obtain low-sulfur petroleum coke of which the sulfur content is less than or equal to 2wt%, wherein the catalyst is selected from at least one complex formed by bonding an active metal and an organic ligand through a coordinate bond. According to the method provided by the invention, high-efficiency conversion of the raw oil is realized, and the yield of high-quality petroleum coke is increased; meanwhile, the method also widens the raw material of the low-sulfur petroleum coke, and realizes the economic added value of the raw oil, especially the high-sulfur inferior raw oil.

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