226 results about "Fluoridation reaction" patented technology

The invention relates to the technical field of chemical synthesis, and provides a synthesis method of 2, 4-difluoronitrobenzene, which comprises the following steps: under the action of a catalyst, carrying out fluorination reaction on 2, 4-dichloronitrobenzene and a fluorinating agent to obtain 2, 4-difluoronitrobenzene; the catalyst comprises tetrabutylammonium bromide and tetrabutylammonium chloride, and the mass ratio of the tetrabutylammonium bromide to the tetrabutylammonium chloride is (1: 5)-(5: 1). According to the technical scheme, the problems of low yield and low purity during synthesis of 2, 4-difluoronitrobenzene in related technologies are solved.

The invention provides an ultra-pure thorium fluoride production process which comprises the following steps: preparing a nanoscale ThF4.xNH4F precursor through a gas-liquid-solid three-phase reaction, atomizing an ammonium fluoride solution into microdroplets by adopting ultrasonic atomization, and carrying out synergistic reaction with gaseous ammonium fluoride and a liquid-phase thorium nitrate solution; a microwave-plasma synergistic fluorination reaction is adopted, and the precursor is heated in a high-purity inert atmosphere to generate crude thorium fluoride; according to the ultra-pure thorium fluoride production process provided by the invention, the purity of thorium fluoride is remarkably improved through the technical means of preparation of a nanoscale precursor through a gas-liquid-solid three-phase reaction, microwave-plasma synergistic fluorination, multi-stage sublimation combined with graphene-based nano trapping membrane purification, intelligent process control, by-product closed-loop recovery and the like; the impurity content is low, and the requirements of nuclear reactor fuel substrates and high-end optical coatings on ultra-high purity are met. The method has the advantages of high yield, high process stability and small purity fluctuation among batches, and the production efficiency and the product consistency are obviously improved.

The invention provides a meltable fluororesin end group fluorination treatment system and a meltable fluororesin end group fluorination treatment process. The system comprises at least two feeding tanks, a reaction tower and a cooling tank, the top ends of the feeding tanks are connected with an N2 gas pipeline and are provided with resin raw material inlets, and the N2 gas pipeline is provided with a valve; the top end of the reaction tower is connected with the bottom end of the feeding tank through a pipeline, a valve is arranged on the pipeline, the top end of the reaction tower is connected with a tail gas treatment pipeline, the bottom end of the reaction tower is connected with an N2 / F2 mixed gas pipeline and an N2 gas pipeline, and a valve is arranged on the pipeline; the top ends of the cooling tanks are connected with the bottom end of the reaction tower through pipelines, valves are arranged on the pipelines, the bottom ends of the cooling tanks are connected with a product output pipeline and an N2 gas pipeline, and valves are arranged on the pipelines. The system can ensure that the fluorination reaction of the end group of the meltable fluororesin is continuously carried out, the production efficiency of the fluorination reaction is remarkably improved, the system avoids the overflow of fluorine, and the safety of the working environment is improved.

The invention discloses a synthesis method of 2, 4, 5-trifluorophenylacetic acid, which comprises the following steps: by taking cheap and easily available o-chloronitrobenzene as a raw material, reacting with sodium nitrate in a sulfuric acid and trifluoroacetic acid system, separating generated 2, 4-dinitrochlorobenzene through melt crystallization, and continuing to synthesize 2, 4-dinitrochlorobenzene in methyl chloroacetate to obtain 2, 4, 5-trifluorophenylacetic acid. The method comprises the following steps: carrying out indirect aromatic nucleophilic substitution reaction on 2, 4-dinitrophenylacetic acid under the condition of sodium hydride to generate 5-chloro-2, 4-dinitrophenylacetic acid methyl ester, separating, carrying out fluorination reaction on the 5-chloro-2, 4-dinitrophenylacetic acid methyl ester and potassium fluoride under the action of a phase transfer catalyst, carrying out rectification separation to obtain 2, 4, 5-trifluorophenylacetic acid, and carrying out hydrolytic acidification on the 2, 4, 5-trifluorophenylacetic acid in a sodium hydroxide aqueous solution to obtain 2, 4, 5-trifluorophenylacetic acid. And the process route is safer, more environment-friendly, more efficient and lower in cost.

The invention belongs to the technical field of fluorine chemical industry, and particularly relates to a preparation method of high-molecular-weight perfluoropolyether, which comprises the following steps: step A, carrying out addition reaction on perfluoropolyether acyl fluoride through a solid catalyst loaded with a metal compound to obtain an intermediate mixture containing perfluoropolyether ketone and perfluoropolyether olefin; and B, carrying out a fluorination reaction on the intermediate mixture obtained in the step A by using a diluted fluorinating agent to obtain the high-molecular-weight perfluoropolyether. Compared with the prior art, the preparation method has the advantages that the problems of high synthesis difficulty and low yield of high-molecular-weight perfluoropolyether due to overlong molecular chain in the prior art are solved; in order to solve the problem, the inventor of the application successfully develops a new path for preparing the high-molecular-weight perfluoropolyether through a large amount of deep research, and the method prepares a higher-molecular-weight product through an acyl fluoride addition reaction of the two-molecular perfluoropolyether, so that the problem of low yield of the existing high-molecular-weight product is successfully solved.

The invention discloses a ternary positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: modifying a ternary matrix material in a composite doping manner of rare earth elements and transition metals, and then coating the surface of the material with a layer of amorphous ferric fluoride in a manner of combining atomic layer deposition with fluorination reaction. The ternary positive electrode material provided by the invention has higher rate capability and better cycling stability, and can maintain better chemical performance under high current density, so that the problems of capacity loss and poor electrical performance of the ternary positive electrode material of the lithium battery in a high-voltage long-cycle process are greatly relieved.

The invention provides a preparation method of an Al18F-labeled PSMA radiopharmaceutical, according to the preparation method, through adjustment of a reaction system, the labeling time efficiency, the radiochemical purity of a final product, the radiochemical conversion rate and the product yield are ensured, meanwhile, the requirement for the fluorination reaction temperature in the labeling process is effectively reduced, and the product yield is improved. The preparation method of the Al18F-labeled PSMA radiopharmaceutical provided based on the method has good applicability and thorough reaction, new impurities are not introduced into a final product due to reduction of the reaction temperature or adjustment of a reaction system, the variety and content of the impurities in the final product can be further reduced and controlled, and the preparation method is suitable for industrial production. And the medication safety of a patient is further ensured. In addition, the final product obtained by the preparation method provided by the invention has good inter-batch uniformity, and has good stability under the storage conditions of 30 DEG C + / -2 DEG C and 40 DEG C + / -2 DEG C.

The invention relates to the field of organic chemical synthesis, in particular to a synthesis method of 6-fluoronicotine. The invention provides a synthesis method of 6-fluoronicotine, which comprises the following steps: by taking a myomine substituent (compound I) as an initial raw material, sequentially carrying out fluorination reaction, reduction reaction and amine methylation reaction to finally obtain the target product 6-fluoronicotine. Through the synthetic route, the 6-fluoronicotine can be obtained, and the product purity can reach 99.0% or above. The synthesis method is simple in process, high in yield and suitable for industrial large-scale production.

The invention discloses a preparation method of a high-boiling-point solvent of 2-thiophenesulfonyl fluoride, which comprises the following steps: carrying out nucleophilic fluorination reaction on 2-thiophenesulfonyl chloride in the high-boiling-point solvent under the action of a fluorination reagent at 0-70 DEG C to generate a 2-thiophenesulfonyl fluoride crude product, carrying out suction filtration to remove inorganic fluoride salt filter residues, and distilling the filtrate under vacuum conditions to obtain the high-boiling-point solvent of 2-thiophenesulfonyl fluoride. And separating the product at the temperature of 30-100 DEG C to obtain the colorless and transparent high-purity 2-thiophenesulfonyl fluoride. The preparation method provided by the invention has the advantages of easily available raw materials, low cost, simple synthesis process, high product purity, high yield, reusable solvent and no generation of toxic and harmful substances, and is suitable for industrial production.

The invention belongs to the technical field of octafluorocyclopentene gas preparation, and particularly relates to a catalytic synthesis method of octafluorocyclopentene. The method specifically comprises the following step: under the action of a fluorine-chlorine catalyst, carrying out gas-phase catalytic fluorination reaction on 1-chloroheptafluorocyclopentene and anhydrous hydrogen fluoride at 80-120 DEG C to obtain octafluorocyclopentene. The preparation method of the fluorine-chlorine catalyst comprises the following steps: dissolving metal chloride in water, adding a precipitant, and fully stirring for reaction to obtain slurry; filtering the slurry to remove filtrate to obtain a solid, and washing the solid with deionized water until the solid is neutral; adding aluminum nitrate into the washed solid, fully stirring and drying to obtain a precursor of the catalyst; and performing compression molding on the precursor of the catalyst, roasting, and activating to obtain the fluorine-chlorine catalyst. The method is mild in reaction condition and high in catalytic efficiency.

The invention relates to a method for high-value recovery of a positive electrode material of a waste lithium iron phosphate battery, which mainly comprises the following steps: adding a lithium iron phosphate positive electrode material, ammonium chloride and hydrogen peroxide into a ball milling tank for grinding, controlling the mass ratio of the ammonium chloride to the lithium iron phosphate positive electrode material to be 5: 2-7: 2, and controlling the volume mass ratio of the hydrogen peroxide to the lithium iron phosphate positive electrode material to be (18-22): 1mL / g; after grinding, washing out the mixture from the ball-milling tank by using deionized water, and then carrying out water leaching treatment to fully leach out metal lithium; excessive ammonium fluoride is added into the filtrate, and reaction liquid and a product lithium fluoride are obtained after reaction; and carrying out adsorption treatment on the reaction liquid by using defluorination resin, regenerating the defluorination resin through elution, combining and concentrating the collected effluent and eluent to obtain an ammonium chloride solution, and recycling the ammonium chloride solution to a chlorination reaction stage. According to the invention, through H2O2 reinforced mechanical chlorination coupling fluorination reaction, nearly total recovery of the waste lithium iron phosphate battery positive electrode material and high value of the product are realized, and the process is simpler and more environment-friendly.

The invention discloses a solvent-free preparation method of 2-thiophenesulfonyl fluoride, which comprises the following steps: carrying out nucleophilic fluorination reaction on 2-thiophenesulfonyl chloride under the action of a fluorination reagent at 0-70 DEG C to generate a 2-thiophenesulfonyl fluoride crude product, distilling under a vacuum condition, and separating the product at 30-100 DEG C to obtain colorless and transparent high-purity 2-thiophenesulfonyl fluoride. The method provided by the invention has the advantages of easily available raw materials, simple synthesis process, high product purity, high yield, large material contact area by adopting a solvent-free method, and reaction time saving; the method does not need solvent recycling and post-treatment links, is energy-saving and environment-friendly, saves the production cost, achieves the purpose of clean production, and has a wide application prospect.

The invention relates to a production method of imidodisulfuryl fluoride and a production method of lithium imidodisulfuryl fluoride, the production method of imidodisulfuryl fluoride takes sulfamic acid, chlorosulfonic acid and thionyl chloride as raw materials, imidodisulfuryl fluoride is obtained through chlorination reaction, imidodisulfuryl fluoride and hydrofluoric acid or imidodisulfuryl fluoride and hydrogen fluoride gas are taken as raw materials, imidodisulfuryl fluoride and hydrogen fluoride gas are subjected to chlorination reaction to obtain imidodisulfuryl fluoride. The invention discloses a method for producing bis (fluorosulfonyl) imide, which comprises the following steps: by taking bis (fluorosulfonyl) imide as a raw material, carrying out fluoridation reaction to prepare a bis (fluorosulfonyl) imide crude product, adding metal salt into the bis (fluorosulfonyl) imide crude product, and then carrying out melt crystallization and / or rectification. According to the method, the metal salt is added into the difluorosulfonyl imide crude product, so that the metal salt can react with a light component in a fluorination reaction system or a component with a boiling point similar to that of the target product difluorosulfonyl imide, and the impurities react to generate salt with a relatively high boiling point; therefore, the components can be separated from the target product imidodisulfuryl fluoride in the subsequent purification process, and the purity of imidodisulfuryl fluoride is further improved.

The invention relates to the technical field of preparation of hydrofluoroolefin, in particular to a method for preparing 2, 3, 3, 3-tetrafluoropropene, which comprises the following steps: carrying out fluorination reaction on 3, 3, 3-trifluoro-2-chloropropene and excessive hydrogen fluoride under the action of a catalyst to generate a first mixture flow containing 1, 1, 1, 2, 2-pentafluoropropane (245cb), and separating the first mixture flow from the first mixture flow to obtain the 2, 3, 3, 3, 3-tetrafluoropropene. Then directly introducing the first mixture flow into a dehydrofluorination reactor for gas phase dehydrofluorination reaction to generate a second mixture flow containing 2, 3, 3, 3-tetrafluoropropene, hydrogen fluoride and unreacted raw materials, finally condensing the second mixture to remove hydrogen chloride, condensing and recycling hydrogen fluoride to obtain a third mixture flow, and rectifying the third mixture flow to obtain 2, 3, 3, 3-tetrafluoropropene. And 3, 3, 3, 3-tetrafluoropropene. According to the invention, unavoidable process wastes in the prior art are converted into recyclable reaction raw materials, the environmental protection and economic pressure of by-product treatment in the prior art is eliminated, meanwhile, the purpose of continuous flow reaction is effectively realized, and the process control difficulty and the process cost are reduced.

The invention discloses a preparation method of 1-fluoromethyl methyl carbonate, which is characterized by comprising the following steps: 1, 1-chloromethyl methyl carbonate is dissolved in a mixed solvent, the mixed solvent comprises an organic phase and a water phase, and the water phase is deionized water; adding a catalytic amount of iodized salt and an excessive amount of acidic fluorination reagent, and carrying out nucleophilic fluorination reaction at 25-80 DEG C; the iodized salt is selected from one of sodium iodide, potassium iodide and tetrabutylammonium iodide, and the feeding molar ratio of the iodized salt to the 1-chloromethyl methyl carbonate is 0.05-0.2; and 2, after the reaction is completed, washing the reaction liquid with water, concentrating to remove the organic solvent, and carrying out reduced pressure rectification on the concentrated liquid to obtain the 1-fluoromethyl methyl carbonate product. The method has the advantages that reaction conditions are mild and controllable, the process is simple, aftertreatment is convenient, the product purity is 99.6% or above, the yield is generally 91% or above, the highest yield can reach 96.76%, the product purity and yield are both greatly improved, and industrial production is greatly facilitated.

The invention relates to the technical field of batteries, in particular to a lithium carbon fluoride battery positive plate as well as a preparation method and application thereof. The method comprises the following steps: placing graphite in a fluorination reactor, filling a fluorination gas source, and carrying out fluorination reaction to obtain graphite fluoride; when the pressure in the fluorination reactor exceeds 200kPa, the pressure release valve is opened, and the fluorination gas source enters the cooler to be cooled and then enters the gas circulating pump to circulate and flow back to the fluorination reactor. According to the invention, a gas source flowing method is utilized, and the fluorination reaction is carried out safely and stably by accurately controlling the gas flow and taking away part of reaction heat, so that the potential safety hazard of chamber explosion caused by overheat reaction in the fluorination process is solved. Uniformly mixing graphite fluoride, a conductive agent, a binder and a solvent to obtain positive electrode slurry; and coating a current collector with the positive electrode slurry, drying, and rolling to obtain the positive electrode plate of the lithium carbon fluoride battery, which has excellent electrochemical performance.

The invention discloses a compound and a synthesis method thereof, the synthesis method of the compound takes heptafluorobutanol as a raw material, and the compound is synthesized through five-step reaction, and the synthesis method comprises the following synthesis steps: S1, taking heptafluorobutanol as the raw material, and carrying out esterification reaction with benzene sulfonyl chloride to obtain an intermediate 1; s2, carrying out substitution reaction on the intermediate 1 to obtain an intermediate 2; s3, carrying out substitution reaction on the intermediate 2 to obtain an intermediate 3; s4, adding inorganic acid into the intermediate 3, dropwise adding a NaClO solution, and reacting to obtain an intermediate 4; and S5, carrying out fluorination reaction on the intermediate 4 to obtain the compound heptafluorobutanol sulfonyl fluoride. According to the synthesis method of the compound, heptafluorobutanol is used as a starting raw material, heptafluorobutanol sulfonyl fluoride is obtained through five-step reaction, use of a dangerous material hydrogen fluoride is avoided, special equipment is not needed, production is safer, and industrial production is more facilitated.

The embodiment of the invention provides a preparation method of a high-load electrode with a vertical pore channel structure and a battery, which comprises the following steps: grinding and premixing carbon fluoride and a conductive carbon material in proportion, adding a binder, carrying out high-speed ball milling to obtain fiberized powder, and rolling to prepare an electrode material, thereby obtaining the high-load electrode with the vertical pore channel structure. Compounding the carbon fluoride with a current collector through hot rolling to obtain a positive pole piece; and finally, carrying out laser pore-forming treatment on the positive pole piece to obtain the high-load carbon fluoride electrode with a vertical pore channel structure. The pore diameter of the pore channel structure is 10-100 [mu] m, the pore pitch is 1-10 times of the thickness of the electrode material, the pore depth is 50-100% of the thickness of the electrode material, the ion tortuosity of the electrode is effectively reduced and the ion transmission efficiency is improved by constructing a vertical pore channel, meanwhile, high-energy laser induces an in-situ defluorination reaction on the pore wall to generate a high-conductivity sp2 carbon phase, and the conductivity of the electrode is improved. And the limitation of sacrifice conductivity of a mechanical pore-forming technology is broken through.

The invention relates to an improved process for the manufacture of a fluorinated organic compound, wherein the process comprises a fluorination reaction of an organic precursor compound having at least one chlorine substituent and / or at least one double bond, and said organic precursor compound is reacted in liquid phase in HF (hydrogen fluoride) serving as solvent and fluorinating agent in the presence of a fluorinating catalyst, and wherein the fluorination reaction is performed in liquid phase in a SiC block chemical reactor, and wherein the reaction mixture is withdrawn from SiC block chemical reactor, and wherein the process comprises optionally isolating and / or purifying the targeted fluorinated organic compound.

The application discloses a continuous production process and equipment for a trifluoromethylbenzene tower, and belongs to the field of organic fluorine chemistry. The production process comprises the following steps: S1: continuously feeding trichloromethylbenzene and hydrogen fluoride into a tower reactor connected with a heat exchanger circulating cooling system in a reverse direction, so that a three-stage continuous fluorination reaction occurs in the tower reactor to obtain crude trifluoromethylbenzene, and unreacted hydrogen fluoride is separated into liquid at the top of the tower and then flows back into the tower reactor; S2: the crude trifluoromethylbenzene obtained in the reaction is subjected to nitrogen bubbling in a bubble tower, and then is continuously distilled in a rectifying tower to obtain finished trifluoromethylbenzene; and S3: byproduct hydrogen chloride generated in the fluorination reaction is introduced into a hydrochloric acid tank to obtain hydrochloric acid, and the content of hydrofluoric acid in the hydrochloric acid is less than 1000 ppm. The method can greatly improve the utilization rate of raw material hydrogen fluoride, improve the purity of byproduct hydrochloric acid, reduce the generation amount of waste acid, avoid the sharp change of pressure in the reaction process, and realize large-scale, continuous, stable and safe production of trifluoromethylbenzene.

The invention provides a fluorination method of a PSMA radiopharmaceutical intermediate, and further provides a preparation method of an Al18F-labeled PSMA radiopharmaceutical preparation based on the fluorination method, and the fluorination method and the preparation method have the advantages that through adjustment of a reaction system, the purity of the PSMA radiopharmaceutical intermediate is improved, and the purity of the PSMA radiopharmaceutical preparation is improved. The preparation method of the PSMA radiopharmaceutical preparation marked by the Al18F has the advantages that marking time efficiency, radiochemical purity of a final product, radiochemical conversion rate and product yield are guaranteed, requirements on fluorination reaction temperature in a marking process are effectively lowered, and the preparation method of the PSMA radiopharmaceutical preparation marked by the Al18F based on the fluorination method is good in applicability, thorough in reaction and high in yield. New impurities are not introduced into the final product due to reduction of the reaction temperature or adjustment of a reaction system, and the preparation method can further reduce and control the variety and content of the impurities in the final product, so that the medication safety of patients is further ensured. In addition, the final product preparation product obtained by the fluorination method or the preparation method provided by the invention has good inter-batch uniformity, and has good stability under the storage conditions of 30 DEG C + / -2 DEG C and 40 DEG C + / -2 DEG C.

The invention belongs to the technical field of infrared focal plane sensor manufacturing, and particularly relates to a vanadium oxide etching post-processing method based on VHF wetting driving. Comprising the following steps: performing graded vacuumizing and temperature programming pretreatment on a wafer subjected to vanadium oxide etching, and continuously introducing VHF moistening mixed gas consisting of anhydrous hydrogen fluoride, ethanol steam and inert carrier gas into a treatment cavity; by accurately regulating and controlling the temperature and pressure of the cavity, anhydrous hydrogen fluoride is promoted to be subjected to a selective fluorination reaction with photoresist decomposition products and metal impurities left after etching to generate gaseous products, and ethanol steam synchronously exerts the dual effects of moistening, corrosion prevention and water molecule desorption promotion. According to the method, a gas phase processing mode is adopted in the whole process, liquid intervention is avoided, the problems of vanadium oxide pixel adhesion and film corrosion can be effectively solved, meanwhile, residual impurities are thoroughly removed, the electrical property stability of the vanadium oxide film is guaranteed, the yield and detection precision of the infrared focal plane sensor are remarkably improved, and the method has good industrial application prospects.

The present invention relates to the technical field of chemical synthesis, and provides a method for synthesizing 2,4-difluoronitrobenzene, which includes the following steps: under the action of a catalyst, 2,4-dichloronitrobenzene and a fluorinating agent are subjected to a fluorination reaction to obtain 2,4-difluoronitrobenzene; the catalyst includes tetrabutylammonium bromide and tetrabutylammonium chloride, and the mass ratio of tetrabutylammonium bromide to tetrabutylammonium chloride is 1:5 to 5:1. Through the above technical solution, the problems of low yield and low purity in the synthesis of 2,4-difluoronitrobenzene in the related art are solved.

The invention discloses a ruthenium complex with fluorine ions as counter anions and a synthesis method and application thereof, and belongs to the technical field of organic synthesis.The ruthenium complex is selected from a compound with the structural formula such as Ru-A or Ru-B or a hydrate of the compound with the structural formula such as Ru-A or Ru-B. The synthesis method is simple, operation is easy, and the ruthenium complex is suitable for industrial production. The ruthenium complex can be used as a catalyst for catalyzing a fluorination reaction of a trifluoromethoxy aromatic compound, has the advantages of high catalytic activity, good substrate compatibility, high product yield and no need of an activating reagent, can be used for later-stage functional modification of complex molecules, and has a good application prospect in the field of organic synthesis; .

The utility model discloses a fluorination reactor's gas leakage monitoring alarm equipment, including blower, high-efficiency collection structure and monitoring alarm structure, the high-efficiency collection structure is provided on the blower, the monitoring alarm structure is provided on the blower, the high-efficiency collection structure includes suction pipe, base, annular pipe and air inlet, the suction pipe is connected to an air inlet of the air blower, the base is fixedly arranged below the suction pipe, and the lower portion of the annular pipe is arranged on the base and communicated with the suction pipe. The utility model belongs to the technical field of fluorination reaction equipment, particularly relates to gas leakage monitoring and alarming equipment of a fluorination reactor, and effectively solves the problems that most of the gas leakage monitoring and alarming equipment of the fluorination reactor is provided with a monitoring device at the outer side of the fluorination reactor, and because the density of hydrogen fluoride is greater than that of control air, the leakage is influenced. And the hydrogen fluoride flows downwards and gathers on the ground, so that the leakage monitoring alarm is delayed, and the environmental safety is influenced.

The invention relates to a secondary fluorination system for synthesizing PF3. The secondary fluorination system comprises a main reactor, a condenser pipe, a secondary fluorination reactor and a cold trap, the invention also discloses a secondary fluorination process for synthesizing PF3, which comprises the following steps: introducing gas-phase HF into a liquid-phase PC13 raw material to generate gas-phase main products PF3 and HCl and a small amount of by-product fluorine chloride, carrying out secondary fluorination reaction on the products through a fluorinating agent ZnF2, almost completely converting the by-products into the target product PF3, and collecting the final product in a cold trap. According to the invention, the content of by-products in the cold trap is greatly reduced, the conversion rate of raw materials is improved, and the purification efficiency of the crude phosphorus trifluoride is improved.

The invention discloses a preparation method of high-purity 2-fluoroethanol, and particularly relates to the technical field of preparation of 2-fluoroethanol, which comprises the following steps: S1, in a dual-catalyst system consisting of a phase transfer catalyst and a Lewis acid catalyst and an organic solvent, carrying out fluoridation reaction on 2-chloroethanol and anhydrous potassium fluoride at 60-120 DEG C for 2-10 hours to obtain 2-chloroethanol; and S2, sequentially carrying out integrated purification of filtration, reduced pressure distillation, adsorption treatment and rectification on the reaction mixture. According to the invention, through synergistic activation and mass transfer of double catalysts, the reaction rate and selectivity are significantly improved, the water segregator is utilized to remove reaction water to push equilibrium movement, the conversion rate is improved, and water and impurities are systematically removed by virtue of composite adsorption and precise rectification of molecular sieves and activated carbon, so that high-quality 2-fluoroethanol with high purity and low moisture is finally obtained. The whole preparation process is mild in condition, high in yield, good in safety and suitable for industrial production.

The present application discloses a full-process continuous process for synthesizing 1,1,1,3,3-pentafluoropropane, including a telomerization reaction: vinyl chloride, carbon tetrachloride, catalyst 1 and a cocatalyst are added to a pre-reactor mixer for premixing to obtain mixture 1, mixture 1 is pumped into a reactor system for telomerization reaction to obtain the material of the telomerization reaction, the material of the telomerization reaction is continuously pumped out and separated to obtain R240fa, and the separated vinyl chloride, carbon tetrachloride, catalyst 1, cocatalyst and unseparated R240fa are returned to the pre-reactor mixer for continuous reaction; a fluorination reaction: the R240fa, chlorine gas and anhydrous hydrogen fluoride obtained from the telomerization reaction are continuously introduced into a fluorination reaction kettle containing activated catalyst 2 for fluorination reaction to obtain a fluorination reaction product, the fluorination reaction product is separated to obtain 1,1,1,3,3-pentafluoropropane, and the remaining product after separating 1,1,1,3,3-pentafluoropropane is returned to the fluorination reaction kettle for continuous reaction.

The application provides a purification method of lithium fluoride, high-purity lithium fluoride, lithium hexafluorophosphate, an electrolyte and a device, and the purification method of the lithium fluoride comprises the following steps: performing water washing treatment on the lithium fluoride to be purified at 0-50 DEG C to obtain a mixture containing a first solid-phase product; performing ultrasonic treatment on the mixture at 20-25 kHz to obtain a second solid-phase product through filtration; performing fluorination reaction on the second solid-phase product with electronic-grade anhydrous hydrofluoric acid to obtain a third liquid-phase product; performing ion exchange on the third liquid-phase product by using a chelating resin at 0-80 DEG C, and then performing cooling evaporation crystallization, and obtaining a fourth solid-phase product through filtration; and performing cleaning treatment on the fourth solid-phase product by using inert gas at 150-250 DEG C to obtain high-purity lithium fluoride. The high-purity lithium fluoride obtained by the purification method has low content of lithium carbonate and other impurities, and is beneficial to improving the performance and stability of subsequent products.

The invention relates to the technical field of energetic materials, in particular to nickel fluoride catalyzed ammonium perchlorate / aluminum composite fuel and a preparation method and application thereof. The ammonium perchlorate / aluminum composite fuel consists of the following components in percentage by mass: 50-70% of ammonium perchlorate, 0-10% of nickel fluoride and the balance of aluminum powder. Due to the addition of NiF2, high and low decomposition peaks of AP are combined into a violent exothermic peak, and the temperature of the high-temperature decomposition peak is reduced by about 30 DEG C, which means that the burning rate of the propellant can be greatly improved; the heat effect of the fluorination reaction (55.98 kJ. G <-1 >) of aluminum is far higher than the heat effect of the oxidation reaction (31.05 kJ. G <-1 >) of aluminum, so that the explosion heat is improved by about 10% while the reaction path is optimized. Besides, the anhydrous NiF2 used in the formula is stable in physical and chemical properties and does not absorb moisture and deliquesce, the problem of long-term storage of common fluorides such as CuF2 and FeF3 is solved, and the product reliability is extremely high.