126 results about "Fluoridation reaction" patented technology

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 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 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 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 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 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 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.

The present invention belongs to the technical field of phosphorus pentafluoride preparation, and in particular to a method for efficiently synthesizing phosphorus pentafluoride using phosphoric acid and hydrogen fluoride. The synthesis method comprises the following steps: adding phosphoric acid and anhydrous hydrogen fluoride into a reactor at a temperature of 20°C to 10°C and mixing them uniformly, then passing SF4 into a mixed reaction, introducing the reaction mixture into a thermal decomposition kettle for thermal decomposition, and performing rectification and separation on the gas phase product obtained by decomposition to obtain high-purity phosphorus pentafluoride; wherein the molar ratio of the phosphoric acid and anhydrous hydrogen fluoride added is 1:1~2; the molar ratio of the SF4 to phosphoric acid is 2~2.5:1. The present invention uses phosphoric acid and anhydrous hydrogen fluoride as raw materials, and by adding SF4 as a dehydrating agent and an auxiliary fluorinating agent, the efficiency of the fluorination reaction can be significantly improved, and the product quality and yield can be improved. The synthesis method of the present invention has the advantages of mild conditions, simple process, low equipment requirements, and environmental protection and high efficiency.

The application provides a preparation method of fluoroethylene carbonate. The method comprises the following steps: uniformly mixing potassium fluoride, a novel solid base catalyst and an organic solvent, then adding chloroethylene carbonate to perform fluorination reaction; after the reaction is completed, the obtained reaction liquid is filtered and distilled to obtain a crude product, and the obtained crude product is subjected to rectification and crystallization to obtain fluoroethylene carbonate; the novel solid base catalyst is composed of a magnesium-aluminum composite oxide coated magnetic nano Fe3O4 carrier and a double-metal fluoride, and the double metal in the double-metal fluoride is a combination of Rb and Co. Compared with the prior art, the application has the following prominent points: (1) less solvent can be used for reaction, and the reaction condition is mild; (2) high selectivity, high activity, less side reaction and high product yield; (3) simple post-treatment, the solvent can be recycled after being evaporated, the generation of three wastes is less, and the industrial production is green and environmentally friendly.

The application designs a method for preparing optically active methyl fluoropropionate by using diethylamine sulfur trifluoride, comprising the following steps: fluorination reaction: under the protection of nitrogen, methyl S-lactate is added to a dry reaction kettle as raw material, the kettle temperature is cooled to a first reaction temperature, diethylamine sulfur trifluoride is added dropwise into the reaction kettle, after dropping, the reaction kettle is heated to a second reaction temperature, after the reaction is completed, the reaction mixture is added dropwise into saturated sodium / potassium bicarbonate aqueous solution to obtain R-2-fluoropropionic acid methyl ester; the molar ratio of diethylamine sulfur trifluoride to methyl S-lactate is 1-1.5:1, the method is high in efficiency, low in three-waste amount, short in reaction path, suitable for industrial production, and has economic value.

The utility model discloses a continuous fluorination reaction system which comprises a feeding assembly and a reaction assembly, the feeding assembly is connected with the reaction assembly through a pipeline, the feeding assembly is formed by connecting a plurality of mixing kettles in parallel, and the reaction assembly is formed by connecting a plurality of reaction kettles in series. According to the continuous fluorination reaction system provided by the utility model, a plurality of mixing kettles are used for mixing and feeding materials into the reaction kettles in turn, so that continuous reaction and no interruption in the reaction kettles are ensured, meanwhile, the whole system works in a totally closed manner, workers cannot be in contact with toxic raw materials during production, the production efficiency is high, the labor intensity is low, and the product quality is stable.

This invention discloses a process and apparatus for the continuous fluorination preparation of 2,6-dichlorobenzonitrile under mild conditions. The apparatus includes sequentially connected units for 2,6-dichlorobenzonitrile preparation, raw material preparation, online dehydration, continuous metering feeding, continuous reaction, and post-treatment, with a supporting control system for precise parameter control. The process first involves the continuous preparation and purification of 2,6-dichlorobenzonitrile at 70–90℃ and 0.1–0.3 MPa. Then, a raw material solution and a fluorination suspension are prepared and deeply dehydrated. Subsequently, a continuous fluorination reaction is carried out at 80–150℃ and 0.1–1.0 MPa. Finally, the finished product is obtained through post-treatment. This invention achieves continuous production throughout the entire process, with mild reaction conditions, a solvent recovery rate ≥95%, a finished product purity ≥99.8%, high production efficiency, low cost, wide equipment adaptability, and easy industrialization.

The invention discloses a preparation method of a low-oxygen magnesium fluoride crystal, and belongs to the technical field of crystal preparation. After the raw materials are molten, the mixed gas activated by the catalytic net is introduced into the crystal furnace in an intermittent pulse mode, active fluorine species in the mixed gas and oxygen impurities on the surface of the melt can be subjected to fluorination reaction so as to reduce the content of the oxygen impurities, airflow in the intermittent pulse ventilation mode is matched with rotation of the crucible to disturb the melt, a reaction interface is updated, and the reaction efficiency is improved. And finally, the low-oxygen magnesium fluoride crystal is obtained through a pulling method.

This invention relates to an alkyl sulfonyl fluoride resin, its preparation method, and its applications. The structural formula of the alkyl sulfonyl fluoride resin is shown below: where n1 is 1~10000; n2 = 0~2. The preparation method includes: mixing compound 1 as shown in Formula I with a nitrite reagent and boron trifluoride diethyl ether and performing a diazotization reaction to obtain compound 2 as shown in Formula II; and then performing a fluorination reaction of compound 2 with a sulfur source, a fluorine source or a fluorosulfonylating reagent and an acid under the action of a catalyst to obtain the resin. Compared with the prior art, the preparation method of this invention is simple, the raw materials are readily available, and the prepared sulfonyl fluoride resin has high reactivity and good stability, and can be used as a high-efficiency matrix resin for the preparation of novel functional resins.

A method for the resource utilization of potassium chloride and potassium fluoride mixed salts, byproducts of polyfluorinated nitrobenzene (PFN) reactions, belongs to the field of resource utilization of potassium salts byproducts of fluorination reactions. The method is characterized by the following preparation steps: 1) removing organic pollutants from the mixed salts through heat treatment to obtain inorganic mixed salts; 2) dissolving the inorganic mixed salts in a solvent to obtain an inorganic mixed salt solution, evaporating and concentrating the solution, cooling and crystallizing, and filtering to separate primary potassium chloride solid and a mixed filtrate; 3) adding a defluorinating agent to the mixed filtrate to obtain precipitated sodium fluoride product and potassium chloride solution; 4) preparing a potassium chloride solution by dissolving the primary potassium chloride solid in distilled water and performing bipolar membrane electrodialysis to obtain a dilute KOH solution; 5) concentrating the KOH solution and then introducing HF gas to prepare potassium fluoride. This invention obtains sodium fluoride, potassium fluoride, and potassium chloride products through salt separation technology and bipolar membrane electrodialysis technology, realizing the separation, purification, and recycling of potassium and fluorine resources.

The invention provides a method for preparing 1, 2, 3-trifluorobenzene, which comprises the following steps: by taking 1, 2, 3-trichloro-4, 6-dinitrobenzene as a starting material, carrying out fluorination reaction, hydrogenation reduction reaction, diazotization reaction and deamination reaction to obtain the 1, 2, 3-trifluorobenzene. The initial raw material can be prepared from 1, 2, 3-trichlorobenzene through a nitration reaction, and the preparation method has the advantages of high yield, few three wastes, high safety and the like, is a green method which is high in selectivity, high in economical efficiency and environmentally friendly, and is suitable for industrial production.

The invention relates to a method and device for continuously synthesizing o-trifluoromethyl benzoic acid, and the method comprises the following steps: step 1, fluorination reaction: anhydrous hydrogen fluoride, o-methyl benzoic acid and sulfur tetrafluoride are pumped into a first-stage dynamic tubular reactor, and are subjected to fluorination reaction in the first-stage dynamic tubular reactor to generate o-methylbenzotrifluoride; then carrying out gas-liquid separation on the reaction liquid to obtain an o-methylbenzotrifluoride intermediate; and 2, oxidation reaction: pumping an organic solvent, an oxidant and o-methylbenzotrifluoride into a secondary dynamic tubular reactor, carrying out oxidation reaction in the secondary dynamic tubular reactor to generate o-trifluoromethyl benzoic acid, and carrying out gas-liquid separation on the reaction liquid to obtain the o-trifluoromethyl benzoic acid product. The method has the advantages of easily available raw materials, low cost, short reaction steps, simple operation process, high yield, few byproducts, high purity, realization of industrial production, reduction of the discharge amount of wastewater and waste liquid, and reduction of the environmental protection pressure.

A system and method for preparing germanium tetrafluoride through direct fluorination of fluorine gas comprises an adsorption tank, the bottom of the adsorption tank receives raw material gas, the top of the adsorption tank is connected with the bottom of a buffer tank through a pipeline, the bottom of the buffer tank receives helium gas, the top of the buffer tank is connected with a fluorination reactor through a pipeline, and a stock bin is installed on the fluorination reactor. The fluorination reactor is further connected with a precooler through a pipeline, and a filter is arranged on the connecting pipeline; the precooler, the first-stage condenser, the second-stage condenser, the third-stage condenser, the impurity removal adsorption tank, the flash tower and the finished product tank are sequentially connected end to end; the preparation method comprises a fluorine gas pretreatment process; a fluorination reaction process; and purifying and collecting. According to the method, germanium tetrafluoride in an effective reaction time period is collected to obtain a product with relatively high purity, and the purity of crude germanium tetrafluoride is high.

The invention discloses a thiane electrolyte additive and a preparation method thereof, 4-fluoro-1, 2, 6-oxydithiane-2, 2, 6, 6-ditetraoxide is used as the thiane electrolyte additive, the usage amount of the thiane electrolyte additive is 0.5%-2% of the mass of an electrolyte, and the preparation method comprises the following steps: 1, 3-dichloro-2-propanol is used as a starting material, and 1, 3-dichloro-2-propanol is used as a starting material; the electrolyte additive is prepared through fluorination reaction, addition reaction, acidification and cyclization reaction, the purity of a sample prepared through the method can reach about 99.5%, the water content is lower than 50 ppm, and the quality requirement for using the product as the electrolyte additive can be met; when being used as an electrolyte additive, the electrolyte additive can remarkably improve the high-voltage electric cycle performance and the high-temperature electric cycle performance of a battery, and is beneficial to reducing the storage internal resistance increase amplitude of the battery and prolonging the service life of the battery at various temperatures and charge states.

The utility model discloses a dangerous chemical fluorination practical training device which comprises an aluminum fluoride cooler, a sulfuric acid circulating pump, an acid cooler, an HF purifier, a fluidized bed reactor, a rotary furnace reactor, an HF heater, a fluorite screw feeder, a waste residue screw discharger, an aluminum hydroxide screw feeder and the like. The rotary furnace reactor is connected with the waste residue spiral discharging machine through a pipeline and is connected with the HF purifier through a pipeline; the practical training device has the advantages that the practical training device embodies a pipeline connection structure among equipment such as the aluminum fluoride cooler, the sulfuric acid circulating pump, the acid cooler, the HF purifier, the fluidized bed reactor, the rotary furnace reactor and the HF heater, and embodies circulation of raw materials in a fluorination reaction and circulation and circulation processes of substances such as gas and solid generated after the reaction.

The invention discloses a gas-phase one-step preparation method of 2, 2, 2, 3-tetrafluoropropene, and belongs to the technical field of fluorine chemical industry. The method aims at solving the problems that in the prior art, the technological process is complex, selectivity is poor and cost is high. The method is characterized in that gas-phase 1, 1, 2, 3-tetrachloropropene and / or 1, 1, 1, 2, 3-pentachloropropane and gas-phase hydrogen fluoride are mixed and preheated, and the mixture is introduced into a reactor filled with a specific catalyst for a one-step fluorination reaction. By optimizing parameters such as a raw material molar ratio and reaction pressure and cooperating with separation and purification processes including removal of HCl by a light component tower, refining by a heavy component tower and water alkali washing, high conversion rate of the raw materials and high selectivity of the reaction are realized.

The present invention relates to the field of organic chemical synthesis, and specifically relates to a 6-fluoronicotine synthesis method. The 6-fluoronicotine synthesis method uses a myosmine substitute (compound I) as a starting material, which sequentially undergoes a fluorination reaction, a reduction reaction and an amine methylation reaction, to finally obtain the target product 6-fluoronicotine. The product purity of the 6-fluoronicotine obtained by means of the synthetic route can reach 99.0% or more. The present synthesis method has a simple process and a high yield, and is suitable for industrial scale-up production.

The utility model discloses a high heat transfer pipe type reactor structure for gas phase fluorination reaction in the technical field of pipe type reactor, including the protective shell, install the spiral reaction pipe in the protective shell, have the first cooling pipe and the second cooling pipe on the spiral reaction pipe and wind, the middle of spiral reaction pipe is equipped with a plurality of radiating fins, and the first cooling pipe and the second cooling pipe are arranged on the both sides of radiating fin respectively, and the both sides of protective shell are installed with first radiating mechanism and second radiating mechanism respectively, the utility model discloses through winding first cooling pipe and second cooling pipe on spiral reaction pipe and carrying out radiating treatment, and through the water flow of flowing, heat is discharged, through the radiating fin, the first cooling pipe and the second cooling pipe on both sides are isolated, prevent the airflow disorder inside protective shell, the setting of first radiating mechanism and second radiating mechanism, improve the radiating efficiency.

The application discloses a method for preparing uranium tetrafluoride based on a reduction hydrogen fluoride reaction, and is applied to a system for preparing uranium tetrafluoride based on a reduction hydrogen fluoride reaction; steps are as follows: 1, thermal decomposition of ammonium fluoride; 2, separation of ammonia and hydrogen fluoride in mixed gas; 3, reduction hydrogen fluoride reaction of uranium oxide; 4, recycling of tail gas. The method has the advantages that: the uranium oxide is reduced and hydrogen fluoridated by adopting a three-stage fluidized bed structure to prepare uranium tetrafluoride, compared with an existing 'uranium purification-uranium conversion' process, continuous control of production can be realized, and the process flow is greatly shortened.