102results about How to "Low yield" patented technology

The invention relates to the technical field of metal pressing, in particular to a precise mold manufacturing method for gearbox parts, which comprises the following steps: automatically feeding at an initial feeding speed and detecting raw materials; feeding is conducted at the initial pushing frequency, and the raw materials are conveyed into a first station, a second station and a third station; the pressure borne by the raw materials in any station is calculated, the machining working condition is judged, and machining parameters are adjusted according to the machining working condition; according to the number of the stations not meeting the working conditions, whether the material of the to-be-machined raw material changes or not is judged, the deformation coefficient of the raw material is calculated, and the initial pressure value of a stamping head is correspondingly adjusted; according to the adjustment condition of the machining parameters of the stamping head, whether the adjusted machining efficiency meets the machining requirement or not is judged, the stamping duration difference value between the procedures is calculated, and the stamping period, the circulation period and the pushing frequency are correspondingly adjusted; and the workpieces are conveyed to the discharging opening to be discharged. The precision of the gearbox part manufacturing process is improved by conducting multi-station automatic machining on raw materials.

The invention belongs to the technical field of coking product extraction and organic separation, and particularly relates to a method for refining 2, 3, 5-tricresol and 3-methyl-5-ethyl phenol from a tricresol mixture. According to the method for refining the 2, 3, 5-tricresol and the 3-methyl-5-ethyl phenol from the tricresol mixture, the tricresol mixture is rectified to obtain the mixed tricresol, the mixed tricresol and the isobutene are subjected to the tert-butylation reaction under the action of the catalyst, and due to the fact that the 2, 3, 5-tricresol and the 3-methyl-5-ethyl phenol do not react with the isobutene, the 2, 3, 5-tricresol and the 3-methyl-5-ethyl phenol are not reacted with the isobutene. The method comprises the following steps: taking 2, 3, 5-trimethylphenol as a raw material, reacting other phenols with isobutene to generate corresponding tert-butyl phenol, boiling point of a tert-butyl product is obviously higher than that of 2, 3, 5-trimethylphenol and 3-methyl-5-ethyl phenol, performing rectification to obtain a 3-ethyl-5-cresol crude product and a 2, 3, 5-trimethylphenol crude product, and performing solvent refining and melt crystallization to obtain 3-ethyl-5-cresol of which the content is greater than or equal to 99% and 2, 3, 5-trimethylphenol of which the content is greater than or equal to 99%.

The invention discloses a biogas fermentation purification liquefaction and carbon capture process. The process comprises a biogas fermentation system for performing high-temperature fermentation on biomass; the biogas purification and liquefaction system, the CO2 purification and liquefaction system and the organic fertilizer production system are arranged at the biogas residue output end of the biogas fermentation system to produce organic fertilizer; a thermal energy recovery system; according to the invention, a high-temperature facultative anaerobic hydrolysis and high-temperature anaerobic fermentation process is provided, so that high-concentration biomass biogas is produced; cH4, H2S and CO2 in the biogas are separated and liquefied by adopting a process of'wet process and dry process serial desulfurization, PSA (Pressure Swing Adsorption) + MDEA (Methyl Methanol Ether Alcohol) decarburization, molecular sieve dehydration, single-order two-stage mixed refrigerant compression and propane refrigeration compression ', and produced liquid CH4 and CO2 are recycled; meanwhile, the biogas residues are subjected to a secondary fermentation technology under the action of microorganisms to obtain a solid organic fertilizer; in addition, the solar heat collection and heat pump technology is utilized, and the whole-field heat energy is recycled to supply heat to the biogas fermentation system.

The invention discloses a distillation purification method for preparing a silane coupling agent, and belongs to the technical field of preparation of silane coupling agents. The distillation and purification method for preparing the silane coupling agent comprises the following steps: step 1, mixing a silane coupling agent crude product, tetrahydrofuran, an organic antioxidant and an auxiliary agent, heating, mixing and stirring to obtain a mixture; 2, adding the mixture into a distillation tower, heating and distilling, controlling the heating temperature and the distillation rate, and ensuring stable and continuous evaporation and condensation of the silane coupling agent; and 3, collecting the condensed liquid into a collector, separating the liquid, filtering, and drying to obtain the silane coupling agent. According to the method, the product purity and yield of the silane coupling agent can be effectively improved.

The invention discloses a method for preparing a core-shell structure phase hydrorefining catalyst, comprising the following contents: (1) gelling, aging and filtering a first precipitant, a sodium molybdate solution and a solution containing Ni and Si to obtain a filter cake of a first slurry, and then treating it with a mixed aqueous solution of aluminum salt and organic alcohol to obtain a mixed slurry; (2) adding a Ni-containing solution, a sodium tungstate solution, a second precipitant and the mixed slurry obtained in step (1) to a reactor containing water and an oily liquid to gel and age them to generate a second slurry; (3) filtering, drying and molding the slurry to obtain a molded product; (4) soaking the molded product in an organic acid solution, and desalting the soaked molded product to obtain a catalyst. The preparation process of the method is clean and pollution-free, and the prepared catalyst has a core-shell structure, a large pore volume and a large pore size, and is used in processes such as distillate hydrodesulfurization and denitrogenation, and has high hydrodesulfurization and hydrodenitrogenation reaction performance.

The utility model discloses a stirring device for cement production, which relates to the technical field of stirring devices for cement production and comprises a box body, a feed hopper is fixedly mounted on the side wall surface of the box body, a mounting hole is formed in the upper wall surface of the box body, and a driving box is fixedly mounted in the mounting hole. A motor is started, a driving gear is in meshed connection with a driven gear, so that the driven gear drives a center rod to rotate, the center rod drives a rotating disc to rotate, a rotating rod is made to revolve with the center rod as the circle center, and the rotating rod indirectly drives a stirring rod to revolve and stir materials; and the materials are uniformly mixed and stirred in the mode that the materials rotate and revolve on the stirring rod, so that the working efficiency of cement stirring is improved, and the yield of cement production is increased.

The invention provides a transcranial light adjusting method and system based on a laser light source and transmitting energy through an optical fiber bundle, relates to the technical field of physiotherapy, and mainly comprises a power supply, a controller, a laser, an optical fiber coupler, the optical fiber bundle, a lens group and the like. The optical fiber coupler couples laser output by the laser into the incident end of the optical fiber bundle; the emergent end of the optical fiber bundle is set as one or more sub optical fiber bundles, and the tail end of each sub optical fiber bundle is selectively butted with one lens group; when the emergent end of the optical fiber bundle is provided with a plurality of sub optical fiber bundles, the plurality of sub optical fiber bundles are respectively and correspondingly arranged at the back of the prefrontal lobe, the belly of the prefrontal lobe, the temporal lobe, the apical lobe and other physiotherapy positions which are effective for light; and when the tail ends of the plurality of sub-optical fiber bundles are not butted with the lens group, the emergent end of each sub-optical fiber bundle is set as an optical fiber array, and the optical fiber array is embedded into the light supply effective head position and is in contact with the scalp, so that the absorption rate and the reflectivity of the hair to near-infrared light are reduced.

The invention belongs to the technical field of organic synthesis and drug intermediate preparation, and relates to a resolution preparation method of a monepantel key intermediate. In the first aspect, the invention provides a preparation method of a compound shown as a formula 3, which comprises the following steps: # imgabs0 #, in which R1 is selected from TMS, TES, TBDMS, TIPS, TBDPS or # imgabs1 #, the reaction is as follows: # imgabs2 # comprises the following steps: step 2, reacting a compound shown as a formula 2 with an ammonia source and a cyaniding reagent to obtain the compound shown as the formula 3; according to the method 2, the reaction is as follows: # imgabs3 # comprises the following steps: step 5, a compound shown in a formula 7 is subjected to the action of ammonia gas to obtain a compound shown in a formula 3; on the second aspect, the invention provides a preparation method of a compound shown as a formula 5, and the reaction is as follows: # imgabs4, in which R1 is as described in the first aspect; the method comprises the following steps: step 3, obtaining a compound shown as a formula 5 from a compound shown as a formula 3 under the action of a resolving agent. The method disclosed by the invention is higher in yield, simpler in post-treatment and simple and convenient to operate, and has a good industrial production prospect.

The invention belongs to the field of organic synthesis, and particularly relates to a preparation method of PM-PBB3 and analogues thereof, which comprises the following steps: # imgabs0: # imgabs1 # represents a double bond or a triple bond, and * F represents F or 18F; comprising the following steps: (1) reacting a compound 6 in the presence of epoxy bromopropane and inorganic base to obtain a compound 7; and (2) reacting the compound 7 in the presence of TBA * F and KH * F2 to obtain a compound 8. The method has the advantages of simple synthetic route, low requirements on reaction equipment, mild reaction conditions, simple operation and easily available raw materials; a plurality of brand new intermediates are obtained in the synthesis process, and the intermediates are stable in property and good in reproducibility, so that industrial large-scale production is easy to realize.

The utility model relates to the technical field of hard engineering plastic bell jar type insulators, and discloses a hard engineering plastic bell jar type insulator, which comprises a structural iron cap, an insulator is sleeved in the structural iron cap, and a steel foot is sleeved in the insulator. According to the hard engineering plastic bell-jar-shaped insulator, through the arrangement of the structural iron cap, the steel foot and the insulator, engineering plastic, the iron cap and the steel foot are subjected to injection molding to form an integrated structure by a special mold through an injection molding machine. The insulator with the structure is high in insulator strength, light in weight and excellent in electrical performance, avoids the problems of zero value of a traditional porcelain insulator and spontaneous explosion of a glass insulator, and greatly reduces the maintenance workload. The problems that an iron cap and a steel foot are bound into a whole through a cement adhesive in the prior art, maintenance in a water pool is needed, the process is tedious, and the yield is low are solved, the one-time forming process is simple, the yield is high, the weight is light, and the iron cap is an ideal upgraded product and has good application and popularization prospects.

The invention discloses high-yield diisobutyryl peroxide and a synthetic preparation method thereof, and belongs to the technical field of chemical synthesis. Comprising the following steps: by taking deionized water as a reaction solvent, controlling the temperature at 0-5 DEG C, and meanwhile, under the catalysis of alkali metal, performing peroxidation on isobutyryl chloride to obtain the diisobutyryl peroxide. The yield of the product diisobutyryl peroxide is higher than 90%, the problem that high reaction temperature is needed in an existing preparation method is solved, the production process is simplified, the production cost is reduced, and the production efficiency is improved.

The present invention belongs to the field of biochemical engineering technology, and specifically relates to a method for producing octadecadicarboxylic acid by fermenting Candida visweiss. The method for producing octadecadicarboxylic acid by fermenting Candida visweiss described in the present invention comprises the following steps: (1) transferring the Candida visweiss seed liquid into a fermentation tank with a prepared culture medium for culturing; (2) adding substrate in stages or continuously during the fermentation process; (3) collecting the fermentation liquid after the fermentation is completed, extracting octadecenoic acid, and then hydrogenating it to obtain octadecadicarboxylic acid; the Candida visweiss has a preservation number of CCTCC NO: M 20222052, which is preserved in the China Center for Type Culture Collection, with the preservation address at Wuhan University, the preservation date being December 23, 2022, and the Latin name is Candida viswanathii The method of the present invention has high conversion efficiency, high product purity and high yield.

The present invention provides a novel method for synthesizing butyl remdesivir, that is, remdesivir shown in formula II reacts with butanol or a mixture of butanol and an organic solvent in the presence of a base, and butyl remdesivir shown in formula I is obtained by separation. The method of the present invention uses easily available remdesivir as a reaction substrate, and the target product can be obtained in one chemical reaction step. The separation step is simple and easy to operate, and the yield can reach 87%, which is greatly improved compared with the prior art. At the same time, the butyl remdesivir obtained by the present invention has a high purity, which can reach more than 99%.

This invention discloses a method for synthesizing venlafaxine hydrochloride, comprising the following steps: reacting a Grignard reagent obtained from the reaction of bromocyclohexane with metallic magnesium with acrolein to obtain compound-1; reacting compound-1 with methanesulfonyl chloride to obtain compound-2; reacting compound-2 with triethylamine to obtain compound-3; reacting compound-3 with hydrogen peroxide and acetic anhydride in the presence of sodium hydroxide to obtain compound-4; oxidizing compound-4 with ozone and then reducing it with sodium borohydride to obtain compound-5; reacting compound-5 with methanesulfonyl chloride and then with dimethylamine to obtain compound-6; reacting a Grignard reagent obtained from the reaction of p-bromoanisole with metallic magnesium with compound-6 to obtain compound-7; and reacting compound-7 with hydrogen chloride to form a salt to obtain venlafaxine hydrochloride. The raw materials used in this invention are inexpensive and readily available, with a total molar yield of 67.98%, and the produced venlafaxine hydrochloride has a purity of over 99.5%. The product has high yield, low cost, and good quality, making it suitable for industrial production.

A hydrochloric acid oxidation catalyst oxidizes hydrochloric acid. The hydrochloric acid oxidation catalyst includes a carrier, and copper, an alkali metal, and a rare earth element that are carried by the carrier. A differential value of a spectrum obtained by differential thermal analysis of the hydrochloric acid oxidation catalyst is 0.035 µV / sec or less relative to a baseline in the range of 290 to 400°C.

The invention provides a methacrolein oxidation method, an oxidation catalyst and a preparation method and application thereof, the catalyst has an X-ray diffraction pattern shown in the following table, the relative intensity ratio of # imgabs 0 # * is the peak height ratio of each peak to the highest peak, the highest peak 2theta of the catalyst is equal to 26.30 + / -0.09 degrees, and the d-spacing is # imgabs 1 #. The yield of the acrylate copolymer is reduced, a better technical effect is achieved, and the method can be used for industrial production of methacrylic acid.

This invention belongs to the field of back-contact battery technology, specifically relating to a back-contact battery and its battery assembly with a specific front-side structure. This specific front-side structure includes a tunneling oxide layer and a specifically doped amorphous silicon layer sequentially disposed on the front side of a silicon substrate. Within the specifically doped amorphous silicon layer, a low-doped amorphous silicon layer, a high-doped amorphous silicon layer, and an oxygen-doped amorphous silicon layer are sequentially disposed along the direction away from the tunneling oxide layer. The specifically doped amorphous silicon layer is doped with phosphorus (P) and contains hydrogen (H). The P doping concentration C1 in the low-doped amorphous silicon layer and the P doping concentration C3 in the oxygen-doped amorphous silicon layer are both lower than the P doping concentration C2 in the high-doped amorphous silicon layer. This specific front-side structure enables the back-contact battery to achieve an absorption rate exceeding 85% for incident light within 400 nm. The back-contact battery of this invention maintains good performance even after long-term exposure to ultraviolet light, improving the battery's UV reliability while achieving high transmittance and high battery efficiency.

The present invention provides a grading process of oil hydrocracking catalyst and an oil hydrocracking method, comprising: along the material flow direction in the hydrogenation reactor, sequentially filling a protective layer and a catalyst layer in the hydrogenation reactor; the protective layer comprises a protective agent, and the pore volume of the protective agent in the protective layer tends to decrease along the material flow direction in the hydrogenation reactor; the catalyst layer comprises a catalyst, and the total acid amount of the catalyst in the catalyst layer tends to increase along the material flow direction in the hydrogenation reactor; the ratio of the sum of the acid amount of strong acid and medium-strong acid to the total acid amount tends to increase along the material flow direction in the hydrogenation reactor; the main active metal content in the catalyst tends to increase along the material flow direction in the hydrogenation reactor. The present invention can improve the liquid yield of the oil to be treated, increase the yield of kerosene and naphtha, reduce the yield of gas products, and maximize the economic benefits of the device.

The invention discloses a device and a method for implanting a column for a CCGA device, relates to the technical field of electronic packaging, is used for welding a micro-spring on a bonding pad of a substrate, and comprises a positioning base and a positioning plate, the top of the positioning base is provided with a positioning groove used for positioning the base plate, and guide columns are arranged on the two sides, corresponding to the positioning groove, of the positioning base. Guide holes correspondingly matched with the two guide columns are formed in the bottom of the positioning plate, a plurality of positioning needles used for positioning the micro-spring are arranged at the position, corresponding to the position between the two guide holes, of the positioning plate in an array mode, and the diameter of a needle body at the end, connected with the positioning plate, of each positioning needle is not smaller than the inner diameter of the micro-spring; the bottom of the positioning plate is provided with a separating plate for separating the micro-spring from the positioning needle; the plate surface of the separating plate is provided with openings corresponding to the positioning needle and the guide post; according to the invention, the micro-spring is tightly inserted into the positioning pin, and the position of the micro-spring is determined through the positioning pin, so that the tolerance between the micro-spring and the corresponding bonding pad of the substrate is less than 0.01 mm.

The invention belongs to the technical field of wet-process phosphoric acid production, and particularly relates to a method and system for preparing fluosilicic acid from wet-process phosphoric acid extraction tail gas. After the concentration of the tail washing fluosilicic acid is adjusted to 5-8%, the tail washing fluosilicic acid is transferred to a concentrated fluorine recovery system to serve as primary fluorine replenishing water for secondary concentration production, the timing and the replenishing amount of water replenishing and tail washing fluosilicic acid replenishing in a cycle period are controlled through a DCS control system, circulating concentration is conducted on the fluosilicic acid, and the concentration of the tail washing fluosilicic acid is improved. The fluosilicic acid product with the mass concentration larger than or equal to 16% can be prepared, the current production situation of fluorine loss of a tail washing system is fundamentally solved, and the fluorine yield is obviously increased.

An isomerization catalyst characterized in that the catalyst comprises a composite carrier and platinum supported on the composite carrier, the composite carrier comprising 15.0-80.0 mass% of hydrogen type ZSM-22 zeolite, 10.0-70.0 mass% of hydrogen type ZSM-48 zeolite, 10.0-60.0 mass% of aluminum oxide based on the composite carrier. The catalyst is used for n-alkane isomerization reaction, has high activity and good stability, and can obtain higher isomer selectivity and yield, especially higher multi-branched alkane isomer selectivity and yield, and lower cracking product yield.

The present invention discloses a catalytic diesel combined treatment process and system, the treatment process includes the following contents: catalytic diesel is fractionated to obtain component A, component B and component C, component A, component B and component C enter different catalyst beds in a fixed bed hydrogenation reaction zone for reaction respectively, the first liquid phase material obtained after gas-liquid separation of the reaction effluent enters an ebullating bed hydrogenation reaction zone for reaction, and the reaction effluent is separated to obtain naphtha and unconverted diesel. The treatment process is based on the concept of molecular refining combined with a fixed bed-ebullating bed hydrogenation combined process, and the different aromatics in the catalytic diesel raw material are matched with suitable reaction paths for treatment, so as to solve the problems of hot spots and high hydrogen consumption in the existing catalytic diesel process, and at the same time greatly improve the quality and yield of high value-added aromatic products, and the operation cycle of the device is greatly improved.

The invention relates to a preparation method of a key intermediate of macarovir, and relates to the field of pharmaceutical chemicals, (R)-7-benzyloxy-3, 4, 12, 12A-tetrahydro-1H-[1, 4] azino [3, 4-C] pyrido [2, 1-F] [1, 2, 4] triazine-6, 8-diketone is used as a raw material, and the high-selectivity macarovir intermediate is obtained through a Grignard exchange reaction and a condensation reaction. According to the invention, 4-methyl-1-amyl is used for replacing benzyl in Grignard exchange, the chiral selectivity is improved in the condensation step, and the De value of the obtained key macavir intermediate is as high as 98.9%.

The present invention discloses a bulk hydrorefining catalyst and a preparation method thereof. The bulk hydrorefining catalyst of the present invention has a core phase of an amorphous composite oxide containing molybdenum, nickel and silicon, and a shell phase of an amorphous composite oxide containing tungsten, nickel and aluminum. The preparation method is as follows: (1) a first precipitant, a sodium molybdate solution and a solution containing Ni and Si are subjected to a first gelling reaction and a first aging to obtain a first slurry containing Ni, Si and Mo; (2) water and an oily liquid are added to a reactor, and then a solution containing Ni and Al, a sodium tungstate solution, a second precipitant and the first slurry are subjected to a second gelling reaction and a second aging to generate a second slurry; (3) the second slurry is aged and molded; (4) the molded product is subjected to a desalting treatment to obtain a catalyst. The catalyst prepared by the present invention has a large pore volume and pore diameter, has a high hydrodesulfurization and hydrodenitrogenation reaction performance, can avoid excessive cracking of diesel fractions, and has good raw material adaptability, and can process inferior distillate oil raw materials.

The invention discloses a preparation method of cyclic conjugated carboxylic ester, and belongs to the technical field of medicine synthesis. The method comprises the following three steps: A, adding N, N '-dicyclohexylcarbodiimide and cuprous chloride into tert-butyl alcohol, and reacting to generate tert-butyl alcohol isourea; b, adding tert-butyl alcohol isourea into the N-protected 7-ACA, and reacting to obtain an intermediate 3a; and C, selectively hydrolyzing the acetic ester, so as to obtain the tert-butyl (6R, 7R)-3-hydroxymethyl-8-oxo-7-(2-phenylacetamide)-5-sulfo-1-azacyclo [4.2. 0] oct-2-ene-2-carboxylic ester. The process can effectively avoid displacement of intracyclic double bonds during carboxyl esterification, the adopted reaction reagent is relatively safe, the operation requirement is low, the equipment requirement is low, operation is easy, and large-scale industrial production is facilitated.

The present invention provides a method for improving the processing yield rate of tungsten-molybdenum sintered products. According to three-dimensional digital modeling and simulation of pressing and sintering process, combined with the particle size, loose ratio and other characteristics of tungsten-molybdenum materials, the powder filling size and powder car size of the pressed green sheets of different batches of raw materials are determined, and the compression performance of the raw materials used for the pressed green sheets is judged by weighing the unit weight of the pressed green sheets, thereby reducing the processing allowance and improving the product yield rate. For large-scale special-shaped products, the tap density of the tungsten-molybdenum powder raw materials is digitally modeled, and the unit weight of the pressed green sheets after preliminary processing is deducted from the powder filling weight. The volume of the pressed green sheets can be obtained by three-dimensional modeling, and the density formula of the pressed green sheets is: unit weight÷volume of the pressed green sheets=density of the pressed green sheets. The digital modeling and simulation of the sintering process are finally used to accurately adjust the powder car processing technology of the pressed green sheets. The tungsten-molybdenum products made by the powder metallurgy method have a size and shape qualification rate of nearly 100% after implementation, and the utilization rate of the raw materials is improved, thereby reducing the cost and improving the product qualification rate.

This invention discloses a catalyst for the production of ethylene and propylene, its preparation method, and its applications. The catalyst comprises the following components: I) 1%–10% of chemical formula A x B y D z A compound of O4; in the chemical formula, the oxidation states of elements A, B, and D are m, n, and p, respectively, satisfying x·m + y·n + z·p = 8, where m, n, and p are integers not greater than 3; the A x B y D z O4 has a spinel structure; II) 0.5%–10% is selected from at least one oxide of rare earth elements, P, Mo, and W; III) 20.0%–55.0% is selected from at least one zeolite of ZSM-5 and ZSM-11; IV) 10%–30% is a binder; V) 25.0%–60.0% is clay. This catalyst is used in the catalytic cracking of petroleum hydrocarbons to produce ethylene and propylene, and features good catalyst stability, low methane yield, and high ethylene and propylene yields.

The invention provides a method for preparing silanol by silane hydrolysis, which comprises the following steps of: reacting silane serving as a reaction raw material, water serving as an oxide and a metal compound serving as a catalyst to obtain silanol; wherein the molecular formula of the silane is SiHR1R2R3, and R1, R2 and R3 are independently selected from C1-C4 alkyl, phenyl, alkyl-substituted phenyl, halogen-substituted phenyl and alkoxy-substituted phenyl; the metal compound is carbonate of sodium, potassium or cesium. According to the method for preparing silanol through silane hydrolysis, hydrogen is a unique by-product and cannot pollute the environment, and the requirement for green catalysis is met. In addition, the metal compound catalyst is low in cost, the target product silanol can be separated by extracting a reaction mixture, the product yield is high, operation is simple, and implementation is easy. In addition, the method is mild in reaction condition and easy for industrial application.

The invention provides a method for synthesizing 3-chloro-bicyclo [1.1. 1] pentylamine salt and an intermediate thereof, and belongs to the technical field of medicine synthesis. According to the method, bicyclo [1.1. 1] pentane-1-carboxylic acid-3-carboxylic acid methyl ester is adopted as an initial raw material, the 3-chlorine bicyclo [1.1. 1] pentylamine salt is obtained under mild and appropriate conditions through the steps of visible light catalytic decarboxylation chlorination, hydrolysis, rearrangement and deprotection, the whole route is simple to operate, the used raw materials are commercially available and easy to obtain, the total yield of a hectogram-grade product is up to 41.27%, the product purity is up to 98.3%, and the method is suitable for industrial production. Through amplification and parallel batch verification, hectogram-level products can be stably obtained, and the method is safe and suitable for amplified production.

One object of the present invention is to provide a method for producing kerosene from alkane feedstocks generated by Fischer-Tropsch synthesis, the method comprising at least one hydroconversion step and at least one hydroisomerization step arranged in series, wherein the operating conditions and catalysts implemented in the steps are selected in a highly specific manner to selectively produce kerosene fractions while minimizing the yield of light fractions (e.g., light C1-C4 gases, naphtha) and the yield of oil products, the latter being limited by optional discharge of recycled effluents.