1676results about "Halogenated hydrocarbon preparation" patented technology

The invention relates to a synthesis method of 1, 2-bis (4-vinyl phenyl) ethane, which comprises the following steps: 1) under the action of magnesium or zinc, carrying out self-coupling reaction on benzyl halide at a benzyl position to obtain 1, 2-bis (4-halogen phenyl) ethane, and 2) preparing the 1, 2-bis (4-vinyl phenyl) ethane from the 1, 2-bis (4-halogen phenyl) ethane, which is selected from any one of the following schemes: 2i: carrying out self-coupling reaction on the 1, 2-bis (4-vinyl phenyl) ethane obtained in the step 1) to obtain the 1, 2-bis (4-vinyl phenyl) ethane. The preparation method comprises the following steps: preparing a Grignard reagent from 1, 2-bis (4-halogen phenyl) ethane, and coupling the Grignard reagent with vinyl chloride to prepare 1, 2-bis (4-vinyl phenyl) ethane; and (2iii) coupling the 1, 2-bis (4-halogen phenyl) ethane obtained in the step (1) with vinyl magnesium chloride to prepare the 1, 2-bis (4-vinyl phenyl) ethane. According to the invention, the 1, 2-bis (4-vinyl phenyl) ethane is prepared from p-benzyl halide through two-step reaction at a relatively high yield, and the yield of the two-step reaction can reach 86.9%.

The invention discloses an alpha, omega-diiodo perfluoroalkane derivative, an alpha, omega-diiodo ethyl perfluoroalkane derivative as well as a preparation method and application of the alpha, omega-diiodo perfluoroalkane derivative and the alpha, omega-diiodo ethyl perfluoroalkane derivative. According to the method, alpha, omega-diiodo perfluoroalkane is taken as a raw material, and the alpha, omega-diiodo perfluoroalkane and ethylene are subjected to free radical addition reaction under the action of an initiator and a solvent to prepare the alpha, omega-diiodo ethyl perfluoroalkane. The alpha, omega-diiodoethyl perfluoroalkane and alkali are subjected to a one-molecule and / or two-molecule hydrogen iodide hydride elimination reaction, and alpha, omega-iodoethyl vinyl perfluoroalkane and / or alpha, omega-divinyl perfluoroalkane are / is generated. The method is simple and convenient to operate, the raw material utilization rate and the target product yield are high, the preparation cost is effectively reduced, and the industrial production requirement is met. The alpha, omega-diiodo perfluoroalkane derivative or alpha, omega-diiodo ethyl perfluoroalkane derivative prepared by the method disclosed by the invention can be used as a vulcanization point monomer for preparing peroxide vulcanized fluororubber, and compared with common rubber, the rubber has more excellent compression deformation performance, strength and medium resistance and has a wide application prospect.

The invention relates to a method for continuously producing 1, 1, 1, 3-tetrachloropropane, which comprises the following steps: adopting a loop reactor in which a beam pipe is arranged in the reactor, mixing reaction raw materials ethylene and carbon tetrachloride at a Venturi nozzle at the lower part of the reactor through a gas circulation loop and a liquid circulation loop outside the reactor, and spraying into the reactor filled with a main catalyst. A cocatalyst and a chelating agent are added into a carbon tetrachloride raw material in advance, are pumped into a liquid loop by a feeding pump and then enter a reactor. Reaction raw materials are circularly stirred under the action of a beam pipe in the reactor, so that solid, liquid and gas phases are fully mixed. By adopting the method disclosed by the invention, the selectivity and the production efficiency of the 1, 1, 1, 3-tetrachloropropane can be greatly improved, and the method also has the advantages of simplicity in operation, environment friendliness, long service life of the catalyst and low cost.

The invention discloses a low-cost and environment-friendly process for producing 1, 4-bis (4-fluorobenzoyl) benzene, and belongs to the technical field of Friedel-Craft reaction, fluorobenzene and paraphthaloyl chloride react to generate 1, 4-bis (4-fluorobenzoyl) benzene, after reaction quenching, filtering is performed to obtain a crude product 1, 4-bis (4-fluorobenzoyl) benzene and filtrate, and the 1, 4-bis (4-fluorobenzoyl) benzene is purified in a sublimation crystallization mode; standing and layering the filtrate in an inclined plate layering device, respectively treating an oil layer and a water layer, dehydrating a fluorobenzene layer in a dehydrating tower, and returning fluorobenzene; the water phase is firstly subjected to organic matter removal treatment, the obtained organic matter enters a fluorobenzene recovery device to be sleeved back, and the obtained water phase is a byproduct of crystallized aluminum chloride in an evaporative crystallization device. According to the process, the 1, 4-bis (4-fluorobenzoyl) benzene is produced in a sublimation crystallization mode instead of a solution crystallization mode, no waste solvent is generated, the waste solvent does not need to be recycled, the cost is low, organic matter removal and evaporative crystallization treatment is carried out on wastewater, organic matter recycling is carried out, crystalline aluminum chloride is produced as a byproduct, and wastewater and waste salt are not discharged.

The invention discloses a method for synthesizing deuterated olefin under catalysis of a palladium membrane by taking D2O as a deuterium source, and belongs to the technical field of synthesis of deuterated olefin building blocks. According to the method, a three-chamber electrolytic tank separated by a palladium membrane and an ion exchange membrane is used as a reactor, the palladium membrane is used as a working electrode, an electrolyte deuterium aqueous solution is used as an electrolyte, deuterium water is electrolyzed through a constant-potential electrolysis method, and formed active deuterium is transmitted to one side of an organic reaction taking absolute ethyl alcohol or cyclohexane as an organic solvent; and catalyzing an alkyne compound by using a palladium membrane modified by sodium thiophenol to perform reduction deuterization so as to synthesize a deuterated olefin compound with high selectivity, and further synthesizing a corresponding deuterated drug. The invention provides a green, efficient, high-universality and low-cost amplification synthesis method for synthesizing a deuterated olefin building block containing a functional group easy to reduce and hydrolyze, and the method has a wide application prospect.

The invention discloses a method for continuously producing fluorobenzene, which comprises the following steps: S10) mixing anhydrous hydrogen fluoride and aniline in a tubular reactor to obtain an aniline hydrofluoride mixture; s20) introducing the aniline hydrofluoride mixture into a venturi tube reactor in an inert gas atmosphere, sucking powdered and dried sodium nitrite into the venturi tube reactor in a negative pressure environment formed by the venturi tube reactor, and carrying out a synthetic reaction to obtain a diazonium solution; s30) transferring the diazonium solution into a tubular reactor for pyrolytic reaction to obtain a crude fluorobenzene solution; s40) refining the crude fluorobenzene raw material to obtain fluorobenzene; according to the method disclosed by the invention, the crossing from an intermittent artificial kettle reaction to a continuous reaction is realized, the reaction is sufficient and complete, no 70% hydrofluoric acid mother liquor, no 70% sulfuric acid waste liquor, no high-concentration wastewater and no yellow mud solid waste are produced, a high-quality fluorobenzene product can be continuously prepared in a large batch, and the method has good economic and environmental benefits and a wide market application prospect.

The utility model provides a chlorination device for producing 3, 4-dichlorobenzotrifluoride, which belongs to the field of chemical industry production and comprises a barrel body, a support is fixedly mounted at the bottom of the barrel body, and a stirring component is arranged in the barrel body; the grinding assembly comprises a grinding hopper, a conical grinding plate, a guide hopper, a fixing plate, a lifting plate and a reciprocating screw rod, the grinding hopper is fixedly arranged on the inner wall of the barrel body, the conical grinding plate is matched with the grinding hopper, the guide hopper is fixedly arranged at the top of the conical grinding plate, the fixing plate is fixedly arranged at the top of the guide hopper, and the lifting plate is arranged on the lifting plate. And the reciprocating screw rod is fixedly arranged at the inner top of the barrel body. According to the chlorination reaction device, the stirring assembly is arranged, a solution can be fully stirred and mixed, the chlorination reaction efficiency is guaranteed, the grinding assembly is further arranged, a large catalyst can be ground, and therefore the catalyst is pulverized, and the chlorination reaction efficiency is further improved.

The invention relates to the technical field of chemical automation control, and discloses an intelligent closed-loop control system for producing p-dichlorobenzene by a biomass method, which comprises a signal acquisition module, a residence time reconstruction module, a thermal coupling analysis module, a parameter self-adaptive scheduling module and an execution control module. The rheological characteristics of raw materials are monitored by collecting the current of a stirring motor, the liquid level is dynamically increased through a retention time reconstruction module to prolong the retention time of the materials, and a liquid level periodic migration strategy is introduced to prevent scaling of a gas-liquid interface; the thermal coupling analysis module and the parameter self-adaptive scheduling module are used for calculating thermal retardation post factors, temperature control parameters are corrected in real time, the upper limit of cooling output is limited, inner wall supercooling crystallization is prevented, and the problems that the conversion rate is reduced, the heat transfer efficiency is reduced and equipment is hung on the wall due to viscosity fluctuation of biomass raw materials are effectively solved. And the self-adaptive stable control of the reaction process is realized.

The invention relates to the technical field of quantum information devices, and particularly discloses a fullerene Y3N-C80-based probability bit device and a preparation method thereof.The probability bit device comprises fullerene Y3N-C80 molecules, graphene point electrodes, a metal electrode and a substrate, the fullerene Y3N-C80 molecules are connected to the two graphene point electrodes, the graphene point electrodes are connected to the metal electrode, and the metal electrode is connected to the substrate. The graphene point electrode and the metal electrode are located on the substrate, and the fullerene Y3NatC80 molecules are connected with the graphene point electrode through amide covalent bonds. According to the invention, the electric dipole moment is driven to overturn under the condition that different transverse source-drain bias voltages are applied to the probability bit device, so that the probability bit device can present different conductive states, the time proportion of the conductive states can be adjusted according to the magnitude of the applied transverse source-drain bias voltages, and the purpose of regulating and controlling the single-molecule probability bit device is achieved.

The present invention discloses a method for synthesizing 9-bromoanthracene. Anthracene and potassium bromide are used as raw materials. The final product, 9-bromoanthracene, is obtained by reacting anthracene and potassium bromide in the presence of ferric chloride and 1-acetoxy-1,2-benzidoxyl-3-(1H)-ketone. The method has the advantages of being inexpensive and readily available, easy to produce, and readily purifiable, and can be developed into an industrialized production method.

The invention provides a polybenzyl chloride type monomolecular resin photoresist based on an adamantane structure as well as a preparation method and application of the polybenzyl chloride type monomolecular resin photoresist. According to the invention, the advantages of non-chemically amplified photoresist and monomolecular resin are combined, and a series of monomolecular resin based on adamantane core and periphery grafted benzyl chloride groups are synthesized. The series of compounds are simple in synthesis process, have very high thermal stability and good film-forming property, and can meet the requirements of a photoresist process. Electron beam and extreme ultraviolet lithography show that the series of photoresist materials are expected to meet the requirement of high-resolution lithography.

The invention relates to a method for separating azeotrope of 1-fluoro-1, 1-dichloroethane and 1, 1, 1, 3, 3-pentafluorobutane through extractive distillation. According to the method for separating the 1-fluoro-1, 1-dichloroethane and the 1, 1, 1, 3, 3-pentafluorobutane azeotrope through extractive distillation, an extracting agent is added into the 1-fluoro-1, 1-dichloroethane and the 1, 1, 1, 3, 3-pentafluorobutane azeotrope, and the extracting agent is one or more of n-amyl alcohol and n-heptanol. The method adopts intermittent extractive distillation or continuous extractive distillation operation, and has the advantages of simple and efficient separation process, high product purity and the like. The loss rate of the extracting agent is low, the extracting agent can be recycled, and environmental pollution can be avoided.

This method for producing a deuterium-labeled compound is characterized by comprising: supplying a proton supply source and heavy water to the anode side of a membrane electrode assembly including an electrode and a proton conductive membrane; supplying a compound to be deuterated to the cathode side of the membrane electrode assembly; and energizing the membrane electrode assembly to deuterate the compound on the cathode side.

This invention discloses a trifluoromethyl-containing polysubstituted phosphatic six-membered ring phosphonooxide compound, its preparation method, and its applications. Using a diene-containing tertiary phosphonooxide compound as a starting material, a radical domino cyclization reaction is initiated with a trifluoromethyl reagent and a nucleophile, in the presence of a transition metal copper catalyst and a pyridine-oxazoline ligand, to obtain the compound. C-O, C-N, and C-C couplings are achieved, and the type of nucleophile can be changed to diversify the product structure. All diastereomers can be isolated, with a single diastereomer yield reaching 85%, exhibiting excellent diastereoselectivity. This invention provides a novel reaction mode for the radical-mediated construction of polysubstituted phosphatic six-membered rings, with mild reaction conditions, simple operation, and good substrate universality. It provides a novel skeletal structure for organophosphorus reagents and expands their diversity. The compound synthesized in this invention can be used as a catalyst in the Appel reaction, showing promising application prospects.

The invention belongs to the technical field of octafluoropropane purification, particularly relates to a device and a method for purifying octafluoropropane, and provides the following scheme aiming at the problems that gas flows to easily generate bubbles and the bubbles wrap impurities in the processes of octafluoropropane rectification and the like: the device comprises a rectifying tower, the bottom of the rectifying tower is fixedly connected with an extraction liquid box, and a round hole is formed in the outer side of the rectifying tower; a purification outlet is fixedly connected to the interior of the round hole, a spraying head is arranged in the rectifying tower, and an input pipe is fixedly connected to the top end of the spraying head. According to the device and method for purifying the octafluoropropane, the bubble breaking piece accurately breaks bubbles, impurities and the octafluoropropane are thoroughly separated, the spoiler strengthens the separation effect, the impurities are evenly enriched, the liftable suction outlet is matched, the impurities are accurately sucked away, impurity residues in a finished product are greatly reduced, and the product quality is improved. And the purity of the perfluoropropane is assisted to stably reach a high standard.

The present invention provides a photolysis base and a preparation method thereof, a patterned material, a patterned film, an electronic device and a preparation method thereof, the photolysis base comprising an anion represented by formula 1, and the present application is helpful to improve the resolution of a photoresist and reduce line width roughness (LWR) at the same time.

To provide novel methods for producing fluoro-diiodoalkanes and divinyl perfluoroalkanes, characterized by simplicity, less production equipment limitations, and reduced energy consumption during manufacturing.SOLUTION: The present invention provides a method for producing "R1-CHICH2-Rf-CH2CHI-R1" (fluoro-diiodoalkanes) by reacting a perfluoroalkyl diiodide represented by the general formula (1) I-Rf-I (1) and an unsaturated compound represented by the general formula (2) H2C=CHR1 (2) in the presence of (i) an amine through light irradiation in an organic solvent, or a method for producing "R1CH=CH-Rf-CH=CHR1" (divinyl perfluoroalkane) by reacting the perfluoroalkyl diiodide and the unsaturated compound in the presence of (ii) a cyclic amidine through light irradiation in an organic solvent.SELECTED DRAWING: None

The invention belongs to the technical field of organic synthesis, and particularly relates to a method for continuously synthesizing 2-chloropropane, which comprises the following steps: uniformly mixing preheated hydrogen chloride gas and vaporized isopropanol through a mixer, introducing into a fixed bed reactor filled with a solid catalyst, and contacting with the catalyst to start reaction to generate mixed gas containing 2-chloropropane; and carrying out gas-liquid separation on the mixed gas containing 2-chloropropane, and standing and layering the liquid phase to obtain the 2-chloropropane product on the upper layer. According to the method, the problem of continuous synthesis of 2-chloropropane is solved, the production efficiency is greatly improved, meanwhile, the problem that high-price special material equipment is needed in the reaction is solved, and the production cost is reduced. The problems of high reaction temperature, low selectivity and low yield are solved, the product purity of the reaction exceeds 99%, and the yield reaches more than 98.5%.

The invention belongs to the technical field of octafluoropropane rectification tail gas recovery treatment in the high-purity electronic special gas industry, and particularly relates to a skid-mounted octafluoropropane tail gas recovery treatment device and a use method. The device comprises a buffer tank, a catalytic reaction tower, a heat exchanger, a recycling unit, a plasma cracking unit and a tail gas treatment unit, the buffer tank is communicated with the catalytic reaction tower, the catalytic reaction tower is communicated with the heat exchanger, one end of the heat exchanger is communicated with the plasma cracking unit, the other end of the heat exchanger is communicated with the recycling unit, and the recycling unit is further communicated with the plasma cracking unit; and the plasma cracking unit is communicated with the tail gas recovery unit. According to the invention, recovery of octafluoropropane and the like is realized through two-stage catalytic reaction, and tail gas emission is reduced.

The invention discloses a phosphorus-modified dealuminated nano ZSM-5 molecular sieve as well as a preparation method and application thereof. The surface of the ZSM-5 molecular sieve is subjected to dealumination and silicon enrichment treatment, and then the surface is protected through phosphorus modification, so that the stability of the molecular sieve can be effectively improved. The phosphorus-modified dealumination nanometer ZSM-5 molecular sieve catalyst solves the problems that in the prior art, a homogeneous catalyst kettle type isomerization reaction is high in corrosivity, the catalyst is difficult to regenerate, and a waste catalyst seriously pollutes the environment, the molecular sieve is used as the catalyst for a fixed bed isomerization reaction, continuous production is achieved, and the method is suitable for industrial production. Meanwhile, the preparation of the catalyst is simple and convenient, the requirements on reaction equipment are reduced, and the industrial production potential is relatively great.

The invention belongs to the technical field of chemical engineering, particularly relates to a preparation method and a preparation device of electronic-grade hexafluorobutadiene, and aims to provide a brand-new hexafluorobutadiene synthesis route which can fundamentally solve the bottleneck problem in the existing hexafluorobutadiene production or preparation method. According to the preparation method, chlorotrifluoroethylene is taken as a main raw material, and the electronic grade 4N hexafluorobutadiene meeting the application of the semiconductor industry is prepared through two steps of catalytic polymerization and finished product rectification. The process raw materials and the device are high in utilization rate, impurities such as heptafluorobutene and hexafluorocyclobutene which are difficult to purify do not exist, the quality of the produced finished product can be effectively guaranteed under the condition that the cost is low, and then the technology is more competitive.

The present invention relates to a method for photochemical chlorination of alkanes comprising the steps of providing a mixture of at least one polychloride according to general formulae (I)         [N-R1aR2bR3cR4d][Cl-(Cl2)n] wherein the moities R1, R2, R3 and R4 are alkyl, preferably C1-C6 alkyl, or aryl, preferably C6-C10 aryl, wherein R1, R2, R3 and R4 can be the same or different from each other, wherein a, b, c, d are independently from each other 0, 1, 2 or 3, wherein the sum of a+b+c+d always has to be 4; wherein n> 0, preferably n >= 1, more preferably n = 1-6, even more preferably n = 1, 2, 3, 4, and at least one alkane according to general formulae (II)         CR5eR6fR7gR8h wherein the moities R5, R6, R7 and R8 are H, alkyl, aryl, halogen or two of R5, R6, R7 and R8 being part of a non-aromatic cyclic ring system, wherein R5, R6, R7 and R8 can be the same or different from each other, wherein at least one of the moities R5, R6, R7 and R8 is H, wherein e, f, g, h are independently from each other 0, 1, 2 or 3, wherein the sum of e+f+g+h always has to be 4; and irridiating the mixture at a wavelength in in the range between 350 nm and 1000 nm, preferably in the visable range between 400 nm and 800 nm, preferably between 420 nm and 780 nm, more preferably between 420 nm and 600 nm.

The invention relates to the technical field of organic photoelectric materials, in particular to a co-assembly method for improving energy transfer efficiency of chromophores, a co-assembly body and application. The specific method comprises the following steps: co-assembling a donor substance and perfluorinated aromatic hydrocarbon in a solvent system to prepare a donor-perfluorinated aromatic hydrocarbon compound; the method comprises the following steps: co-assembling an acceptor substance and perfluorinated aromatic hydrocarbon in a solvent system to prepare an acceptor-perfluorinated aromatic hydrocarbon compound; the preparation method comprises the following steps: co-assembling a donor-perfluorinated aromatic hydrocarbon compound and an acceptor-perfluorinated aromatic hydrocarbon compound in a solvent system to prepare a crystal-induced energy transfer precise co-assembly body; the donor substance is 9, 10-bis (phenylethynyl) anthracene, and the perfluorinated aromatic hydrocarbon is octafluoronaphthalene; the acceptor substance is 5, 12-bis (phenylethynyl) tetracene. The problems of high energy dissipation and low FRET efficiency of the donor-acceptor pair with weak aggregation emission in the fluorescence resonance energy transfer process are solved.

The invention provides a preparation method of 2, 5-disubstituted benzyl chloride, and belongs to the technical field of preparation of drug intermediates. The chloromethyl solution is prepared from concentrated hydrochloric acid and paraformaldehyde, the concentration of hydrochloric acid is gradually reduced along with the reaction, and the reaction progress is slow due to the reduction of the concentration of concentrated hydrochloric acid; therefore, the chloromethylation reaction is carried out on the chloromethyl liquid and the disubstituted benzene in the hydrogen chloride gas, and the hydrogen chloride gas is supplemented, so that the concentration of the hydrogen chloride is increased, and the chloromethylation reaction is accelerated; meanwhile, a gradient heating mode is adopted, disubstituted benzene and chloromethyl liquid are subjected to chloromethylation reaction for 2-3 hours at the temperature of 50-60 DEG C, and the temperature is increased to 70-80 DEG C after the concentration of hydrogen chloride is reduced, so that the chloromethylation reaction is accelerated again, and the yield of the product is increased. According to the method, the volatilization and consumption of concentrated hydrochloric acid can be reduced, the generation of wastewater is reduced, the reaction time is shortened, and meanwhile, the yield of 2, 5-disubstituted benzyl chloride is also improved.

The invention provides an alkyne selective hydrogenation catalyst with high activity and high selectivity and a preparation method thereof. The catalyst is a compound of metallic nickel and alkali metal hydride and is marked as nickel-alkali metal hydride, high catalytic reaction activity and high olefin selectivity can be both considered by regulating and controlling the proportion of the nickel elementary substance and the alkali metal hydride, and compared with the metallic nickel and the alkali metal hydride as the catalyst, the catalyst has the advantages that the catalytic activity is high; the catalytic activity and the olefin selectivity are greatly improved. The nickel-alkali metal hydride catalyst is suitable for alkyne selective hydrogenation reaction in a high-temperature and high-pressure fixed bed gas phase reaction system, is also suitable for alkyne selective hydrogenation reaction in a high-temperature and high-pressure reaction kettle liquid-solid phase reaction system, and has a good application prospect.

The invention discloses a treatment method of oxadiargyl byproduct etherified salt slag and hydrolysis waste sulfuric acid, which comprises the following steps: comprehensively treating the byproduct etherified salt slag and hydrolysis waste sulfuric acid generated in the production process of oxadiargyl; the method comprises the following steps: converting etherified salt slag and potassium hydrogen sulfate into an isopropyl bromide product capable of being used for producing oxadiargyl and a potassium hydrogen sulfate product capable of being directly sold, dropwise adding hydrolyzed waste sulfuric acid into a mixed solution of etherified salt slag, water and isopropanol, carrying out a reflux reaction, carrying out atmospheric distillation, cooling and filtering to obtain an isopropyl bromide crude product and a potassium hydrogen sulfate crude product; the treatment method is simple and convenient to operate, the treatment difficulty of the etherified salt slag and the hydrolysis waste sulfuric acid can be solved at the same time, the treatment cost is reduced, effective recovery of the etherified salt slag and the hydrolysis waste sulfuric acid is realized, effective components in the two wastes are fully utilized, and the method is suitable for industrial production. The treatment process basically has no secondary pollution, has no special requirements on production equipment, and can be suitable for industrial production.

The invention discloses a method for generating 1234yf through one-step fluorination of 240db. The method comprises the following step: reacting 240db and hydrogen fluoride under the action of a fluorinated catalyst to generate 1234yf, the catalyst comprises a Ce-Zr composite oxide carrier and one or more than two of Ni, La, Cr, Co, Fe, Sb, Mo and Cu loaded on the carrier. The method disclosed by the invention has the characteristics of stable and controllable process and long service life of the catalyst while ensuring high selectivity and high yield, effectively reduces material consumption and equipment maintenance cost in industrial production, and overcomes the problems of economy and stability in large-scale production in the prior art.

The invention relates to the field of catalysts, in particular to a modification method of a molecular sieve catalyst and application of the molecular sieve catalyst in polychlorobenzene isomerization, and the modification method of the molecular sieve catalyst comprises the following steps: (1) carrying out dealumination on the molecular sieve catalyst, and then carrying out first washing and drying treatment; (2) dispersing the catalyst obtained in the step (1) in a metal salt aqueous solution, adding an alkali solution to adjust the pH value of the system to 8-11 for aging, and then carrying out second washing and drying treatment, the mass ratio of the metal salt to the catalyst to water being (0.01-0.15): 1: (4-40), and the mass of the metal salt being metered by the metal amount; (3) dipping the catalyst obtained in the step (2) in an organic sulfonic acid or salt solution thereof, separating, and then carrying out third washing and drying treatment; and (4) roasting the catalyst obtained in the step (3) to obtain the modified molecular sieve catalyst.

The invention discloses a preparation method of 2-fluoro-4-methylaniline, which has the following synthetic route: # imgabs0 #, wherein R1 is selected from one of-CN,-CX3 (wherein X is halogen) and-COOR (wherein R is H or C1-C6 alkyl). The synthesis method disclosed by the invention is simple, has the advantages of high yield, simple post-treatment, low cost and the like, meanwhile, the raw materials are easy to obtain, the reaction danger coefficient is low, the problems of high synthesis cost, low yield, high reaction danger coefficient and the like in the prior art are solved, and the method has a good industrial application prospect.

The present disclosure addresses the problem of providing a novel method for separating fluorocarbons.　Provided is a method for separating fluorocarbons that includes separating a second mixture from a first mixture containing a fluorocarbon A having one or more double bonds and having n carbon atoms and a fluorocarbon B which does not have a double bond but has m carbon atoms, the second mixture being different from the first mixture in terms of the compositional ratio of the fluorocarbon A and the fluorocarbon B. The separation is carried out by bringing the first mixture into contact with an adsorbent material containing a metal organic structure.