264results about "Phosphorus halides/oxyhalides" patented technology

The invention discloses a phosphorus oxyfluoride reaction and separation integrated preparation tower, and belongs to the field of industrial equipment for phosphorus oxyfluoride preparation, the preparation tower comprises a tower body, the tower body is provided with a feeding area, a reaction area and a separation area, the feeding area and the separation area are both filled with filler sections of filler, a first feeding port is formed in the bottom of the filler section in the feeding area, and a second feeding port is formed in the bottom of the reaction area. A tubular heat exchanger is arranged in each reaction zone, a threaded pipe is arranged on each tubular heat exchanger, filler is also filled between the threaded pipes, a second feeding hole is formed in the upper part of the reaction zone on the top layer, and polyphosphoric acid and anhydrous hydrogen fluoride are contacted in the reaction zones to form a concentration stepped reaction and a temperature stepped reaction; and the phosphorus oxyfluoride gas generated after the reaction is fractionated through the filler section on the separation area and enters the next process from the top of the tower body. According to the invention, the reaction and separation of phosphorus oxyfluoride production are integrated, the energy consumption of phosphorus oxyfluoride production is reduced, the production cost is reduced, and the reaction yield is improved.

The invention discloses a preparation method and a production system of phosphorus trifluoride, and belongs to the technical field of preparation of phosphorus trifluoride. Phosphorus trichloride and first mixed gas are continuously introduced into a reactor, the first mixed gas comprises anhydrous hydrogen fluoride and inert gas, phosphorus trichloride and anhydrous hydrogen fluoride in the first mixed gas are subjected to a double decomposition reaction in the reactor, and intermediate gas containing phosphorus trifluoride is generated. Collecting intermediate gas discharged from the reactor, and rectifying and purifying the intermediate gas to obtain a phosphorus trifluoride product. The inert gas carries anhydrous hydrogen fluoride and phosphorus trichloride to generate double decomposition reaction to generate phosphorus trifluoride, and the inert gas can dilute the concentration of the raw material gas anhydrous hydrogen fluoride participating in the reaction and also can take away heat generated by the reaction, so that the temperature of the reactor is more stable, and continuous production of phosphorus trifluoride is realized.

The invention discloses a purification process of phosphorus trifluoride. The purification process comprises the following steps: S1, heating liquid in a first storage tank, and pumping the heated liquid into a flash evaporator for flash evaporation; s2, introducing the flashed gas into a first rectifying tower for rectification, condensing the rectified top products phosphorus trifluoride and hydrogen chloride, and introducing the condensed top products into an intermediate first product storage tank; s3, pumping the material in the middle first product storage tank into a second rectifying tower for rectification, condensing the top gas rectified by the second rectifying tower, and introducing the condensed gas into the first product storage tank for storage; s4, a finished product in the first product storage tank is pumped into a gasifier to be gasified and enters a gas-liquid separation tank to be separated, and separated gas is discharged from the top and sequentially introduced into three phosphorus trifluoride purification devices to be purified; s5, the purified gas is introduced into a filter to be filtered, the filtered gas enters a filling system to be filled after pressure stabilization, impurities in phosphorus trifluoride can be completely removed, and the purity of phosphorus trifluoride is improved in a jumping mode.

The invention discloses a preparation method of phosphorus oxyfluoride based on reaction separation equipment, which comprises the following specific steps: S1, a heat exchange medium enters a driving pipe fitting through a heat exchange medium inlet pipe of the reaction separation equipment, is pressurized at a discharge end of the driving pipe fitting and then is sprayed out in a horizontally outward inclined manner, a heat exchange mechanism and a second filler layer of the reaction separation equipment are driven to integrally rotate, so that a circulating heat source circularly passes through the whole reaction area; s2, respectively feeding liquid industrial phosphoric acid and gaseous anhydrous hydrogen fluoride when the reaction temperature of the reaction zone reaches a set value; s3, liquid industrial phosphoric acid and gaseous anhydrous hydrogen fluoride are in contact on the surface of the rotating second filler layer and react to generate phosphorus oxyfluoride gas; and S4, extracting phosphorus oxyfluoride gas generated by the reaction along the top of the reaction separation tower body. The controllability of the reaction process can be effectively ensured, and the reaction effect is obviously improved.

The utility model discloses an atomizing nozzle, a phosphorus pentachloride synthesis reactor and a phosphorus pentachloride synthesis system, which comprise a nozzle body, a first inlet, a second inlet, a third inlet, a fourth inlet, a fifth inlet and an outlet, the second inlet and the fourth inlet are both used for introducing first gas, and the fifth inlet is used for introducing second gas; the atomizing nozzle disclosed by the utility model can strengthen gas-liquid mixing and control the size and the shape of atomized particles, and in addition, the atomizing nozzle disclosed by the utility model is arranged on the reactor body, so that the distribution uniformity of materials in the space of the reactor body is improved, and a high-temperature area in the reactor body is reduced or eliminated.

A synthesis method for phosphorus pentafluoride and a synthesis device therefor. The synthesis method comprises: continuously feeding hydrogen fluoride, liquid chlorine and liquid yellow phosphorus into a reactive distillation tower to perform a reaction, so as to obtain phosphorus pentafluoride gas, wherein the molar ratio of hydrogen fluoride, liquid chlorine and liquid yellow phosphorus is 8-12:4-6:1-3. By using hydrogen fluoride, liquid chlorine and liquid yellow phosphorus as raw materials, liquid yellow phosphorus reacts with liquid chlorine in advance in a reactive distillation tower and the resulting product then reacts with hydrogen fluoride, thereby synthesizing phosphorus pentafluoride gas by means of a one-step method. The preparation process is simple, and the synthesis device has a stable and reliable structure and is very suitable for large-scale production, implementation and use.

The invention discloses a phosphorus trifluoride production device and method, and belongs to the technical field of phosphorus trifluoride production, the device comprises a reaction part, a pretreatment part and a post-treatment part, the reaction part comprises a first raw material tank, a second raw material tank, a reaction kettle and a collection cold trap, the pretreatment part comprises a primary separation tower and an absorption tower, and the post-treatment part comprises a secondary separation tower and an absorption tower. The post-treatment part comprises an adsorption tower, a light component removal tower and a heavy component removal tower; the production method comprises the following steps: adding raw materials of phosphorus trichloride and hydrogen fluoride into a reaction kettle to generate phosphorus trifluoride and hydrogen chloride, collecting the phosphorus trifluoride and hydrogen chloride in a collecting cold trap, heating the collecting cold trap to vaporize the phosphorus trifluoride and hydrogen chloride, and sequentially entering a primary separation tower, a light component removal tower and a heavy component removal tower for a series of treatment, and finally, high-purity phosphorus trifluoride gas is extracted from the heavy component removal tower to a filling system. According to the method, high-purity phosphorus trifluoride with the purity larger than or equal to 99.999% can be finally produced, and the problem that in the prior art, the purity of phosphorus trifluoride is not enough is solved.

The invention provides a method for preparing phosphorus pentafluoride, which comprises the following steps: (a) mixing sulfur and phosphorus, and reacting at the temperature of 320-340 DEG C to generate phosphorus pentasulfide; (b) reacting phosphorus pentasulfide with hydrogen fluoride gas at the temperature of 170-190 DEG C, cooling the reaction product to-85 to-60 DEG C, and performing low-temperature rectification separation to obtain pure phosphorus pentafluoride and byproduct hydrogen sulfide; the molar ratio of phosphorus pentasulfide to hydrogen fluoride gas is (1-9.5): 10.2. The phosphorus pentafluoride can be efficiently prepared in an environment-friendly manner by adjusting the reaction conditions and the raw material ratio and reacting the easily available raw materials; and moreover, an electrolysis technology is further introduced to treat the hydrogen sulfide byproduct, so that the purity and efficiency of sulfur recovery are optimized, the purposes of environment-friendly and efficient recovery and utilization of the byproduct are achieved, the overall economical efficiency and safety of the process are improved, and the whole process chain is further perfected.

The invention relates to the technical field of chemical preparation, in particular to a preparation method of phosphorus trifluoride, which comprises the following steps: step 1, preparing reactants: preparing phosphorus pentoxide and pure fluorine gas; 2, mixing reactants: in a proper reaction container, mixing phosphorus pentoxide with pure fluorine gas; step 3, controlling the reaction conditions of reactants: ensuring that the reaction is carried out at proper temperature and pressure so as to promote the smooth proceeding of the reaction; and 4, separating the product to obtain phosphorus trifluoride. The method comprises the following steps: putting phosphorus pentoxide into a dry container, preparing a storage tank filled with fluorine gas, putting the prepared phosphorus pentoxide into a reaction container, introducing the dry fluorine gas from the storage tank, carrying out a reaction at high temperature and high pressure, and after the reaction is completed, adding the fluorine gas into the reaction container, phosphorus trifluoride and a byproduct oxyfluoride are separated through a physical method (distillation or condensation), so that the process is simple, and the reaction conversion rate is high.

The invention discloses a phosphorus trichloride production reaction kettle with a defoaming structure, and relates to the technical field of reaction kettles. According to the phosphorus trichloride production reaction kettle with the defoaming structure, through cooperation of the obliquely-installed sawtooth plates and the protruding strip rings, during rotation, the sawtooth plates drive foam on the liquid level to move towards the periphery, in the movement process, the foam on the liquid level is separated from the protruding strip rings, and the foam on the liquid level is removed. The sawteeth at the top of the sawtooth plate are in contact with accumulated foam, so that part of the foam is broken, the unbroken foam outwards impacts the inner wall of the convex strip ring under the action of centrifugal force, so that the foam is in contact with the convex strips uniformly arranged on the inner wall of the inner convex ring, and compared with a smooth inner wall of a traditional reaction kettle, the contact area is reduced when the convex strips of the inner convex ring are in contact with the foam; and the pressure during impact is increased, so that the foam is broken under higher pressure, and the defoaming effect is improved.

The invention discloses a preparation method of phosphorus trifluoride. The preparation method comprises the following steps: S1, respectively adding phosphorus trichloride and anhydrous hydrogen fluoride into a uniform-temperature material changing structure of a reaction kettle; s2, condensing the crude phosphorus trifluoride gas, introducing the condensed crude phosphorus trifluoride gas into a first storage tank for storage, heating liquid in the first storage tank, and pumping the heated liquid into a flash evaporator for flash evaporation; s3, introducing the gas subjected to flash evaporation into a first rectifying tower for rectification, and introducing a product into an intermediate first product storage tank; s4, rectifying the material in the middle first product storage tank, condensing the rectified gas, and introducing the condensed gas into the first product storage tank for storage; s5, gasifying the finished product in the first product storage tank, enabling the gasified finished product to enter a gas-liquid separation tank for separation, discharging separated gas from the top, and sequentially introducing the separated gas into three phosphorus trifluoride purification devices for purification; s6, the purified gas is introduced into a filter to be filtered, the filtered gas enters a filling system to be filled after the pressure of the filtered gas is stabilized, and the stability of the product and the safety of equipment are guaranteed.

A PROCESS FOR THE PREPARATION OF METAL HEXAFLUOROPHOSPHATE The present invention relates to a mechanical process for the preparation of metal- hexafluorophosphate, wherein the process is devoid of solvent use and purification step and involves less metal use. The present invention also relates to the use of metal-hexafluorophosphate as an electrolyte salt in different batteries.

The invention discloses a continuous preparation method of high-purity phosphorus oxyfluoride and a device thereof, and relates to the technical field of production for phosphorus oxyfluoride preparation.According to the continuous preparation method of the high-purity phosphorus oxyfluoride, by conducting preheating treatment on a preheating head tank of polyphosphoric acid, the polyphosphoric acid is preheated from liquid in a viscous state to obtain liquid easy to convey, and the liquid is controlled through an electromagnetic valve; polyphosphoric acid is conveyed into a constant-temperature kettle through a high-level-difference pipeline, the polyphosphoric acid is further heated and stirred to keep constant temperature through the constant-temperature kettle, the polyphosphoric acid and anhydrous hydrogen fluoride are subjected to gas-liquid two-phase exchange contact in a preparation tower to realize reaction and separation, and prepared phosphorus oxyfluoride gas is separated from the top of the preparation tower; after further drying is achieved through the spray drying tower, the phosphorus oxyfluoride product with the purity reaching 99.6%-99.8% is prepared through the condenser and the gas-liquid separator, the reaction yield is 95%-96%, the purity of phosphorus oxyfluoride is high, few side reactions exist in the production process, and the reaction yield is high.

The utility model relates to the technical field of phosphorus trichloride recovery equipment, and discloses a phosphorus trichloride gaseous cooling recovery device, which comprises a main body, a water inlet is fixedly connected below the front side of the main body, a water outlet is arranged below the water inlet, and the water inlet and the water outlet are convenient to supplement and discharge water for a water tank. And the lower surface of the main body is fixedly connected with four supports, and the number of the supports is four. Compared with the prior art, the cooling device has the following advantages and effects that through the arrangement of the first cooling pipe, the fins and the spraying mechanism, gaseous phosphorus trichloride is introduced by a worker and then cooled through the first cooling pipe, and then flows into the cooling branch pipes, the fins provide heat dissipation, and the spraying mechanism sprays water onto the fins to improve the heat dissipation effect; the wind power port blows air into the device, the water evaporation efficiency is improved, the heat dissipation effect of the fins is improved again, and the effect of improving the recovery efficiency is achieved through multiple-combination heat dissipation cooling.

The invention relates to a preparation method of phosphorus pentafluoride, which comprises the following steps: mixing a fluorocarbon compound with a phosphorus oxide compound and an oxidizing agent, reacting in a dry closed environment at high temperature and high pressure, collecting gas, and purifying to obtain the phosphorus pentafluoride. The invention also discloses a preparation method of lithium hexafluorophosphate, which comprises the following step: carrying out gas-solid reaction on the obtained phosphorus pentafluoride and lithium fluoride in a fluidized bed to prepare the lithium hexafluorophosphate. The method solves the problems of low purity of lithium hexafluorophosphate, difficulty in treatment of byproducts, low production efficiency and the like in the prior art.

The invention discloses reaction separation equipment for preparing phosphorus oxyfluoride, which comprises a reaction separation tower body, the lower end of the reaction separation tower body is sequentially provided with a feeding zone, a plurality of reaction zones and a separation zone from top to bottom, the feeding zone and the separation zone are fixedly filled with first filler layers, and the reaction zones are filled with second filler layers; the heat exchange mechanism comprises a heat exchange medium inlet container and a heat exchange medium outlet container, a plurality of heat exchange guide pipes are evenly distributed on the periphery of the heat exchange medium inlet container and the periphery of the heat exchange medium outlet container respectively, and heat exchange medium circulation pipes pre-buried in the second packing layer are longitudinally connected between the heat exchange guide pipes respectively; corresponding driving pipe fittings are upwards and rotationally mounted at the feeding ends of the heat exchange medium inlet pipes respectively; and a plurality of heat exchange medium discharge pipes. According to the invention, the reaction temperature uniformity in each reaction zone can be effectively improved, and the sufficient uniform distribution effect is ensured when materials slowly flow through the reaction zones.

The present invention belongs to the technical field of phosphorus pentafluoride preparation, and specifically relates to a method for synthesizing phosphorus pentafluoride by using yellow phosphorus and fluorine gas. The synthesis method comprises the steps of dissolving yellow phosphorus in an inert solvent to prepare a yellow phosphorus solution, then passing the yellow phosphorus solution and fluorine gas into a microchannel reactor for mixed reaction, and separating and purifying the generated gaseous product through a pressurized condensation system to obtain phosphorus pentafluoride. The synthesis method of the present invention utilizes a specific inert solvent to dissolve highly reactive yellow phosphorus, and then continuously synthesizes phosphorus pentafluoride by reacting the yellow phosphorus solution with fluorine gas in a microchannel reactor through a gas-liquid phase reaction. The method has the advantages of low reaction temperature, high reaction efficiency, few reaction by-products, and high product yield.

The invention discloses a continuous or semi-continuous preparation method of high-purity phosphorus pentafluoride, which comprises the following steps: (1) a mixed gas containing phosphorus pentafluoride and solid aluminum fluoride react to prepare an aluminum hexafluorophosphate solid, and the mixed gas contains phosphorus pentafluoride, hydrogen fluoride and hydrogen chloride; and (2) heating the prepared aluminum hexafluorophosphate solid to 250-450 DEG C, carrying out thermal decomposition, and collecting to obtain the high-purity phosphorus pentafluoride gas. The method has the advantages of no need of high-pressure and low-temperature physical separation in the technological process, safe and controllable reaction, high product purity, suitability for industrial production and the like.

Provided in the present application is a method for treating a heavy bis(fluorosulfonyl)imide residue, comprising the following step: causing a starting material system comprising the heavy bis(fluorosulfonyl)imide residue and an acidic aqueous solution to react to obtain a fluorine-containing acid solution and a crude sulfamic acid product, wherein the fluorine-containing acid solution can be used as a by-product acid, thereby saving treatment costs; and the crude sulfamic acid product can also be directly sold as a product, thereby reducing treatment costs, bringing economic benefits, and achieving resource recycling of the heavy bis(fluorosulfonyl)imide residue.

A method for producing phosphorus trifluoride and a method for producing phosphorus pentafluoride, which have high reaction efficiency, low reaction temperature and an excellent energy efficiency. The method includes: a step of introducing phosphorus trichloride and hydrogen fluoride into a first reactor, and a step of discharging phosphorus trifluoride from the first reactor, the first reactor contains carbon material. The method includes a step of introducing the phosphorus trifluoride obtained above and chlorine into a second reactor, and a step of discharging dichloro-phosphorus trifluoride from the second reactor. The method further includes a step of introducing the dichloro-phosphorus trifluoride obtained above and hydrogen fluoride into a third reactor; and a step of discharging phosphorus pentafluoride from the third reactor. The method further includes a step of introducing the phosphorus pentafluoride obtained above and lithium fluoride into a fourth reactor; and a step of discharging lithium hexafluorophosphate from the fourth reactor.

The invention belongs to the technical field of fluorine chemical material preparation, and particularly relates to a method for continuously preparing phosphorus trifluoride based on liquid-liquid microfluidics. The method comprises the following steps: mixing AHF liquid with an excessive PC13 liquid material in a spherical liquid drop form, introducing the mixture into a spiral tube microreactor, controlling the pressure in the spiral tube microreactor to be 1.0-2.5 MPa and the temperature to be 60-140 DEG C, carrying out reaction, carrying out reduced pressure gas-liquid separation on the reacted material, and separating and purifying a gas-phase component to obtain phosphorus trifluoride, and the liquid-phase component enters the spiral tube microreactor as a PC13 liquid feed cycle to participate in the reaction. According to the invention, efficient, safe and continuous preparation of phosphorus trifluoride is realized through an innovative liquid-liquid microfluidic technology.

The invention belongs to the technical field of synthesis of chemical intermediates, and particularly relates to a system and a method for continuously preparing phosphorus oxybromide. According to the system provided by the invention, through continuous preparation design, continuous production of phosphorus oxybromide can be realized, the preparation efficiency is improved, and the problem that the product yield and purity are reduced due to long-time high-temperature separation is avoided. Phosphorus tribromide is used as a raw material, trichloromethane is used as a solvent, the phosphorus tribromide and the trichloromethane are mixed to obtain a mixed solution, the mixed solution enters the reaction tower and is in contact with a mixed gas of nitrogen dioxide and oxygen entering the reaction tower, phosphorus tribromide is oxidized into phosphorus oxybromide, nitrogen dioxide and residual oxygen are recycled from the top of the reaction tower, waste gas emission is reduced, and the production cost is reduced. The mixed solution of trichloromethane and phosphorus oxybromide firstly passes through the falling film evaporator to evaporate most of the solvent, and then passes through the scraper film evaporator to evaporate the residual solvent, so that the solvent is recycled, the energy consumption is reduced, the time of the phosphorus oxybromide staying in the evaporator is reduced, and the yield and purity of the phosphorus oxybromide are improved.

The invention discloses a production method and a production system of high-purity phosphorus trifluoride and hydrogen chloride, and belongs to the field of preparation of phosphorus trifluoride and hydrogen chloride. The production method comprises the following steps: reacting phosphorus trichloride with anhydrous hydrogen fluoride to generate phosphorus trifluoride and hydrogen chloride, condensing at-20 DEG C to 0 DEG C, refluxing phosphorus trichloride and hydrogen fluoride raw materials, and outputting mixed gas of phosphorus trifluoride and hydrogen chloride; preliminarily rectifying the mixed gas to obtain a phosphorus trifluoride crude product and a hydrogen chloride crude product; the method comprises the following steps: carrying out primary rectification on a phosphorus trifluoride crude product in a phosphorus trifluoride rectification heavy component removal tower and carrying out secondary rectification in a phosphorus trifluoride rectification light component removal tower in sequence to obtain high-purity phosphorus trifluoride gas; the crude hydrogen chloride is subjected to primary rectification in a hydrogen chloride rectification heavy component removal tower and secondary rectification in a hydrogen chloride rectification light component removal tower in sequence, and high-purity hydrogen chloride gas is obtained. According to the production method, high-purity phosphorus trifluoride and high-purity hydrogen chloride can be continuously produced and obtained, meanwhile, the raw material utilization rate can be increased, the product yield can be increased, meanwhile, little waste gas is generated, the waste gas can be completely absorbed, and the requirement for environmental protection is met.

The invention provides a method for treating bis (fluorosulfonyl) imide heavy slag, which comprises the following steps: reacting a raw material system comprising bis (fluorosulfonyl) imide heavy slag and an acidic aqueous solution to obtain a fluorine-containing acid solution and a sulfamic acid crude product; wherein the fluorine-containing acid liquid can be used as a byproduct acid, so that the treatment cost is saved; and the sulfamic acid crude product can also be directly sold as a product, so that the treatment cost is reduced, economic benefits are brought, and resource recycling of the bis (fluorosulfonyl) imide heavy slag is realized.

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.

A compound containing a repeating unit represented by formula (1) as a non-cyclic structure. (In formula (1), X1 represents an oxygen atom. In addition, R represents a hydrogen atom or a substituent. > # imgabs0 #

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 present invention discloses a phosphorus trifluoride purification device, comprising an adsorption tower body, an upper cover, a plurality of air inlet ends, and an air outlet end, and further comprising: a double-position sliding molecular sieve structure, comprising a first molecular sieve adsorption cylinder and a second molecular sieve adsorption cylinder; a pressure variable diameter adjustment structure arranged between the first molecular sieve adsorption cylinder and the second molecular sieve adsorption cylinder, the pressure variable diameter adjustment structure comprising an elastic adjustment component arranged on the inner wall of the adsorption tower body, the upper and lower ends of the elastic adjustment component being respectively connected to the first molecular sieve adsorption cylinder and the second molecular sieve adsorption cylinder, a pressure adjustment disk being connected to the middle part of the elastic adjustment component, the pressure adjustment disk being provided with a plurality of holes for phosphorus trifluoride to pass through, the holes being provided with internal barrier structures, and a top bone component being fixedly provided on the top of the first molecular sieve adsorption cylinder. The present invention maximizes the extension of the service life of the adsorption structure while ensuring adsorption efficiency.

The invention belongs to the field of Lewis acid gas preparation, and particularly discloses a method for preparing high-purity Lewis acid gas, the chemical reaction general formula of the high-purity Lewis acid gas is C + AF-+ X-> C + XF-+ A, C + AF-is a non-volatile ionic compound, C + is K +, Cs +, quaternary ammonium cation and imidazole cation, A refers to a Lewis acid gas molecular formula, and X is another solid or liquid Lewis acid. C < + > is a quaternary ammonium cation, the structural general formula of the quaternary ammonium cation is [NR1R2R3R4] < + >, and R1, R2, R3 and R4 are saturated hydrocarbon chains or saturated hydrocarbon chains containing ether bonds. According to the method disclosed by the invention, the reaction in the preparation process is controllable, the product purity is high, the reaction speed is high, continuous production can be carried out, massive transportation and storage of Lewis acid gas are avoided, and the safety problems in links of production, storage, transportation and the like of the Lewis acid gas are fundamentally solved.

The utility model discloses a phosphorus pentafluoride generating system for a lithium hexafluorophosphate generator. The phosphorus pentafluoride generating system comprises a phosphorus pentafluoride generator, a phosphorus pentachloride feeding valve, a phosphorus pentafluoride reaction valve, a phosphorus pentafluoride feeding valve and a feeding emptying valve, one end of the phosphorus pentachloride feeding valve is connected to a phosphorus pentachloride positive pressure sending tank through a pipeline, the other end of the phosphorus pentachloride feeding valve is connected to one end of the phosphorus pentafluoride reaction valve through a pipeline, and the other end of the phosphorus pentafluoride reaction valve is connected to a feeding port of the phosphorus pentafluoride generator; a discharge port of the phosphorus pentafluoride generator is respectively connected to one end of the phosphorus pentafluoride feeding valve and one end of the feeding emptying valve through pipelines, the other end of the phosphorus pentafluoride feeding valve is connected to the lithium hexafluorophosphate generator through a gas filter, and the other end of the feeding emptying valve is connected to a tail gas collecting device through a pipeline. According to the utility model, the feeding misoperation can be eliminated, the feeding safety is ensured, and the feeding can be controlled to be correct.