80 results about "Phosphorus pentafluoride" patented technology

The invention belongs to the technical field of electrolyte, and particularly relates to a method for preparing liquid lithium hexafluorophosphate from sodium hexafluorophosphate. The method comprises the following steps: adding a sodium source into a hexafluorophosphoric acid aqueous solution for neutralization reaction to obtain a sodium hexafluorophosphate aqueous solution, then extracting to remove water, drying to obtain a sodium hexafluorophosphate solid, and heating and decomposing the sodium hexafluorophosphate solid to obtain phosphorus pentafluoride gas; the phosphorus pentafluoride gas is not mixed with SO3, POF3, HF and other impurity gases, a complex refining and purifying process is not needed, and the phosphorus pentafluoride gas with the purity exceeding 99.9% can be obtained after simple purification and can be directly used for synthesizing liquid lithium hexafluorophosphate. The method does not generate waste acid, does not need a complicated phosphorus pentafluoride gas purification process, is particularly suitable for the requirements of the lithium battery industry on high-purity electrolyte, and has the remarkable advantages of high product purity, small environmental pollution, low production cost and the like.

The invention relates to a preparation method of a lithium difluoro bis (oxalate) phosphate concentrated solution, and belongs to the technical field of lithium battery electrolyte additives. Adding lithium oxalate into a solvent, stirring and dissolving to obtain a lithium oxalate solution; the method comprises the following steps: adding a modified fluorine ion chelating agent into a lithium oxalate solution, stirring, filtering, putting into a reactor, and slowly introducing phosphorus pentafluoride gas; after the introduction is finished, heating and stirring for reaction; after the reaction is finished, filtering reaction liquid to remove unreacted solid impurities, so as to obtain a lithium difluoro bis (oxalate) phosphate concentrated solution; the modified fluorine ion chelating agent is prepared from D301 ion exchange resin, dichloroethane, propylene-1-base boronic acid pinacol ester, mercaptoethyl guanidine dihydro bromide and sodium tert-butoxide. The lithium difluoro bis (oxalate) phosphate prepared by the method is high in purity and high in yield, and meets the use requirements of lithium ion battery electrolyte on lithium salt.

This invention belongs to the field of lithium-ion battery electrolyte material preparation technology, and provides a solid lithium hexafluorophosphate with low fine crystal content and its preparation method. The preparation method involves adding lithium fluoride to anhydrous hydrogen fluoride to form anhydrous hydrogen fluoride slurry. A portion of the anhydrous hydrogen fluoride slurry and phosphorus pentafluoride gas are fed into a primary continuous reaction crystallizer. The resulting slurry is subjected to low-temperature fractionation to form a first stream and a second stream. The second stream enters a secondary continuous growth crystallizer and continues to react with phosphorus pentafluoride gas, followed by solid-liquid separation to obtain a solid wet product and mother liquor. The first stream, another portion of the anhydrous hydrogen fluoride slurry, and a portion of the mother liquor enter a pre-conditioning section, and the resulting pre-conditioned stream is returned to the feed end of the primary continuous reaction crystallizer. The solid wet product is then subjected to low-temperature washing and programmed vacuum drying to obtain the final product. This method, through the combination of fractional reflux, mother liquor participation in pre-conditioning, and continuous growth processes, reduces fine crystal entrainment and improves particle size distribution stability.

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 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.

The invention relates to the technical field of synthesis of hexafluorophosphate, in particular to a synthesis method and a synthesis system of liquid hexafluorophosphate. The synthesis method of the liquid hexafluorophosphate is a new process route, phosphorus trichloride is used as an initial raw material, and a reaction is carried out with a reaction kettle; phosphorus pentafluoride sequentially subjected to oxidation, fluorination, deep fluorination and solvent in-situ capture reacts with alkali metal fluoride to obtain liquid hexafluorophosphate; the whole technical route process has the advantages of controllability, low cost, greenness, high safety and few impurities.

The invention discloses a waste new energy battery crushing and sorting method. The method comprises the following steps that S1, a waste battery and a lithium hydroxide catalytic infiltration material are subjected to vacuum low-temperature freezing and disassembling; s2, neutralizing the lithium-containing precipitate by using an acidic solution to generate anhydrous lithium salt, absorbing the waste gas by using hydrogen fluoride, and synthesizing a precursor by using phosphorus pentafluoride; s3, performing vacuum fractional distillation, and separating low / high boiling point components by a three-way valve; s4, gradient freezing crystallization is conducted, crystals and mother liquor are centrifugally separated at the temperature of-20 DEG C to-50 DEG C at the speed of 1 DEG C / min to 5 DEG C / min, and S5, performing low-temperature vacuum drying on the crystal, and removing moisture and the organic solvent to obtain high-purity lithium hexafluorophosphate; s3, separating a low-boiling-point organic solvent and a high-boiling-point component by utilizing a temperature gradient in a vacuum environment, and preliminarily enriching a target product; in the S4 stage, the crystal precipitation rate is controlled through gradient cooling, so that lithium hexafluorophosphate preferentially forms high-purity crystals, efficient separation of the crystals and mother liquor is achieved in combination with a centrifugal separation technology, and the product purity is guaranteed through the synergistic effect of fractional distillation and gradient freezing.

An integrated process for co-production of phosphorus pentafluoride (PF5) and fluorosulfonic acid (HSO3F) in high yield and purity through a single reaction step is provided. The method comprises reacting a first reagent comprising an aqueous solution of hexafluorophosphoric acid (HPF6) and hydrofluoric acid (HF) with a second reagent comprising fuming sulfuric acid (H2SO4SO3), and recovering a product mixture comprising phosphorus pentafluoride (PF5) and fluorosulfonic acid (HSO3F).

The invention discloses a preparation method of phosphorus pentafluoride, which comprises the following steps: 1) mixing fluorine-containing inorganic salt and hydrogen-containing inorganic salt, and carrying out activation process treatment; and 2) adding phosphorus pentoxide into the system in the step 1) for reaction to generate phosphorus pentafluoride gas. The method has the advantages of low reaction temperature and high product purity, does not need to use high-toxicity and high-corrosivity hydrogen fluoride, and is environment-friendly, simple in process and suitable for industrial production.

The invention discloses a method for separating phosphorus pentafluoride-hydrogen chloride mixed gas, which comprises the following steps of: introducing the phosphorus pentafluoride-hydrogen chloride mixed gas into a reaction kettle by taking a perfluoropolypropyl ether fluorinated solution as a solvent and lithium fluoride as a raw material, so that the phosphorus pentafluoride and the lithium fluoride react to generate lithium hexafluorophosphate, and hydrogen chloride is discharged in a gas phase manner; heating the generated lithium hexafluorophosphate to decompose the lithium hexafluorophosphate into phosphorus pentafluoride and lithium fluoride, discharging the phosphorus pentafluoride in a gas phase manner, and retaining the lithium fluoride in the perfluoropolypropyl ether fluorinated solution for recycling; the solvent and raw materials provided by the invention can be recycled for multiple times, the whole process flow is greatly simplified, and efficient and stable separation of HCl and phosphorus pentafluoride is realized.

The invention belongs to the technical field of lithium ion battery electrolyte, and particularly relates to a method for jointly preparing bis (fluorosulfonyl) imide and monofluorophosphate. The preparation method comprises the following steps: reacting urea, chlorosulfonic acid and phosphorus pentafluoride serving as raw materials to generate a mixture of bis (fluorosulfonyl) imide acid and monofluorophosphoric acid, distilling to remove HCl and PF5 impurities in the mixture, and reacting the mixture with alkali metal salt under the poor solvent condition of monofluorophosphate to obtain a solid-liquid mixture; and carrying out solid-liquid separation on the solid-liquid mixture, and drying the obtained solid to obtain monofluorophosphate, and concentrating the obtained filtrate, adding a poor solvent for recrystallization, filtering and drying to obtain the bis (fluorosulfonyl) imide salt. According to the method, two acids can be synthesized through one-step reaction, the synthesis process flow is simple, the reaction time is short, the production efficiency can be remarkably improved, and the production cost is saved. And the prepared monofluorophosphate and bis (fluorosulfonyl) imide salt are high in quality and can be widely applied to lithium ion battery electrolyte.

The invention relates to a preparation process of high-purity lithium hexafluorophosphate, which comprises the following specific steps: S1, quantitatively adding anhydrous hydrogen fluoride into a corresponding reaction kettle body, and controlling the environment temperature in the reaction kettle body at-50 DEG C to-20 DEG C through a temperature control device; s2, maintaining the pressure in the reaction kettle body at 0.1-0.5 MPa, dispersing and adding solid phosphorus pentachloride into the reaction kettle body through a corresponding feeding device, and enabling the solid phosphorus pentachloride to react with the anhydrous hydrogen fluoride in the step S1 at the temperature of-50 DEG C to-20 DEG C to obtain phosphorus pentafluoride and gaseous hydrogen chloride, the gaseous hydrogen chloride escapes from the reaction liquid and then is discharged for recovery or absorption treatment; and S3, dispersing and adding lithium fluoride into the reaction kettle body through the feeding device, and carrying out complexing reaction on the lithium fluoride and phosphorus pentafluoride in the anhydrous hydrogen fluoride to obtain lithium hexafluorophosphate. The reaction process is high in controllability, so that the high-purity lithium hexafluorophosphate product can be stably prepared.

The invention belongs to the technical field of chemical synthesis, and relates to a lithium battery electrolyte raw material production technology, in particular to a preparation method of phosphorus pentafluoride. The method comprises the following steps: adding phosphorus trichloride, liquid chlorine and hydrogen fluoride into a reactor in proportion, and reacting to prepare hydrogen chloride and phosphorus pentafluoride; the molar ratio of phosphorus trichloride to liquid chlorine to hydrogen fluoride is preferably 1: 1: 5, and the reactor comprises a bottom reaction section, a middle filler section and a top condensation section. The working pressure of the reactor is 0.1-3.0 MpaG, the temperature of the reaction section is 0-40 DEG C, and the temperature of the condensation section is-20 to-60 DEG C. The mixed gas of phosphorus pentafluoride and hydrogen chloride can be prepared in one step and conveyed to the rear end to be refined and separated. The method has the advantages of simple process flow, easily available raw materials, low production cost and high efficiency.

The present invention provides a phosphorus pentafluoride preparation method, which comprises: mixing a hexafluorophosphoric acid solution and a dehydrating agent, and carrying out a dehydration reaction at a temperature of 30-160 DEG C under a pressure of 0.1-3 MPa, wherein the hexafluorophosphoric acid solution contains water and hydrogen fluoride; after the dehydration reaction is finished, the reaction system is subjected to rapid pressure relief, and mixed gas containing phosphorus pentafluoride is obtained; wherein the pressure relief rate of the rapid pressure relief is greater than or equal to 0.1 MPa / min; and carrying out purification treatment on the mixed gas containing phosphorus pentafluoride to prepare the phosphorus pentafluoride gas.

Disclosed in the present application is a method for preparing lithium hexafluorophosphate. According to the embodiments of the present application, the method comprises: performing mixing treatment on phosphorus pentafluoride gas and a lithium fluoride solution to give a first treatment product; and performing reaction treatment on the first treatment product to give a reaction solution containing lithium hexafluorophosphate, wherein the mixing treatment is performed in a first continuous flow reactor, and the reaction treatment is performed in a second continuous flow reactor. The method of the present application overcomes the defects in existing batch production techniques and effectively avoids the ineffective operation time of the start and end stages in conventional production, thereby improving the production efficiency and output per unit time.

The invention discloses tris (trimethylsilyl) phosphate and a preparation method thereof, and belongs to the field of chemical synthesis. The invention relates to a preparation method of tris (trimethylsilyl) phosphate, in particular to a preparation method of tris (trimethylsilyl) phosphate, which comprises the following steps: hexamethyldisiloxane and phosphorus pentafluoride are subjected to heating reaction under a stirring condition to obtain tris (trimethylsilyl) phosphate, and the molar ratio of hexamethyldisiloxane to phosphorus pentafluoride is (5-10): 1. Phosphorus pentachloride is replaced with phosphorus pentafluoride, and due to the fact that fluorine atoms are small in radius and large in electronegativity, phosphorus is high in electropositivity and small in steric hindrance, phosphorus pentafluoride can react with hexamethyldisiloxane more easily, a catalyst is not needed, the cost of tris (trimethylsilyl) phosphate can be greatly reduced, and the yield of tris (trimethylsilyl) phosphate is high.

The present invention discloses a method for preparing phosphorus pentafluoride gas, comprising the following steps: (1) reacting a phosphorus-containing compound with hydrogen fluoride and an organic acid anhydride dehydrating agent to generate a hexafluorophosphoric acid solution; and (2) heating the hexafluorophosphoric acid solution to decompose it into gaseous hydrogen fluoride and phosphorus pentafluoride. The method has high water removal efficiency, simple process, and is easy to be continuously produced.

This invention discloses a method for preparing phosphorus pentafluoride and co-producing difluorochloromethane. The method includes the following steps: 1) vaporizing PCl and reacting it with CHF3 and Cl2 in a reaction tube equipped with a supported catalyst to undergo a fluorine-chlorine exchange reaction, yielding a mixed gas containing products such as PF5 and CHClF2; 2) fractionating the mixed gas in a distillation column, collecting the product PF5 and unreacted CHF3 mixture from the top of the condenser. This mixture is then directly reacted with a LiF carbonate solution to convert it into a high-value-added lithium hexafluorophosphate solution; another product, CHClF2, is collected from the body of the distillation column. This invention utilizes CHF3, a high-temperature-effect, long-life fluorine chemical byproduct, as a fluorine source and PCl3 as a phosphorus source. Through the fluorine-chlorine exchange reaction of CF3H, PCl3, and Cl2, it converts into high-value-added PF5 gas, which is further converted into LiPF6, while simultaneously co-producing CHClF2, thus realizing the resource utilization of fluorine and possessing significant economic and social benefits.

The application discloses a method for producing phosphorus pentafluoride by electrolysis. The method is to use white phosphorus and anhydrous hydrogen fluoride as raw materials, fluorometal salt or quaternary ammonium fluoride salt as conductive agent, and to carry out electrolysis reaction in a high-nickel anode electrolysis container to produce phosphorus pentafluoride. The preparation method can produce high-purity phosphorus pentafluoride in one step, and the impurities are few when used for synthesizing lithium hexafluorophosphate, and no additional hydrogen chloride gas is produced, the post-processing cost is lower, and the production process is safer and more efficient. In addition, the electrolysis reaction condition is mild, the by-product waste is less, the environmental pollution is small, and the phosphorus pentafluoride gas with a purity greater than 99.99% can be obtained.

This invention belongs to the field of inorganic fluoride preparation technology, and relates to a method for preparing high-purity phosphorus pentafluoride gas. A phosphorus pentafluoride mixed gas is passed into dimethyl carbonate, and the mixture is sequentially heated and pressurized for reaction, cooled to precipitate, and filtered to obtain a phosphorus pentafluoride complex solid. The phosphorus pentafluoride complex solid is then sequentially washed, re-dissolved, and distilled to obtain high-purity phosphorus pentafluoride gas. Compared to traditional methods using multi-stage distillation and washing, this method can efficiently and easily remove impurities such as hydrofluoric acid and hydrogen chloride from the phosphorus pentafluoride gas, and does not generate a large amount of waste acid. The purity of the prepared gas is above 99.9%, and the gas yield is above 90%. When high-purity phosphorus pentafluoride gas is used in lithium-ion batteries, it can meet the performance requirements of lithium-ion battery electrolytes.

The application discloses a continuous preparation process and device of liquid lithium hexafluorophosphate, and comprises the following operation steps: A10), continuously feeding lithium fluoride suspension to the top of a hexafluoride reaction plate tower; continuously feeding gaseous high-purity phosphorus pentafluoride to the bottom of the hexafluoride reaction plate tower; A20), carrying out reaction in the hexafluoride reaction plate tower, and feeding the reaction product from the bottom of the hexafluoride reaction tower into a bottom tank; A30), feeding the remaining reaction product output by a circulating heat exchanger into a liquid lithium hexafluorophosphate product extraction tank in one way and into a lithium fluoride suspension preparation kettle in the other way; and A40), connecting a filter to the product extraction end of the product extraction tank to remove the excessive solid-phase material after reaction, so as to obtain the liquid lithium hexafluorophosphate, the hydrogen chloride content of which is less than 25 ppm, and the hydrogen fluoride is not detected; the application has high continuous level and stability, does not need additional deacidification treatment, and has obviously higher output efficiency, and does not have the hidden troubles of shutdown maintenance due to problems such as blockage.

The invention relates to a preparation method of lithium hexafluorophosphate, and belongs to the field of preparation of lithium hexafluorophosphate. The preparation method comprises the following steps: carrying out a high-pressure dry reaction on a lithium fluoride solid and phosphorus pentafluoride gas, continuously introducing the phosphorus pentafluoride gas, pressurizing to 3.4 MPa or above, maintaining the pressure, cooling, and reducing the pressure to prepare lithium hexafluorophosphate; the pressure of the high pressure is 0.9 to 2.5 MPa, and the particle size of the lithium fluoride solid is 200 to 600 meshes. According to the method, the pressure of a reaction system is increased to 3.4 MPa or above, and the pressure is maintained, so that phosphorus pentafluoride gas reaches a gas-liquid supercritical state, and fine lithium hexafluorophosphate crystal particles are rearranged and grow in crystal structures in the environment and are approximately dissolved in the gas-liquid supercritical state of phosphorus pentafluoride; in this way, phosphorus pentafluoride can permeate into crystal grains to further react with lithium fluoride, the residue of lithium fluoride impurities is reduced, and therefore the purity of lithium hexafluorophosphate is improved.

Disclosed are a manufacturing apparatus and manufacturing method for lithium hexafluorophosphate. The disclosed manufacturing apparatus for lithium hexafluorophosphate is configured to synthesize lithium hexafluorophosphate by reacting phosphorus pentafluoride with lithium fluoride and liquid anhydrous hydrogen fluoride, and comprises: a plurality of reactors connected to each other in series; and a plurality of recrystallizers connected to each other in series and installed downstream of the plurality of reactors so as to recrystallize the lithium hexafluorophosphate synthesized in the presence of phosphorus pentafluoride.

The invention provides a preparation method and device of phosphorus pentafluoride, and the preparation method comprises the following steps: 1) carrying out atomization treatment on a mixed acid solution comprising a hexafluorophosphoric acid solution and a sulfuric acid solution to obtain atomized mixed acid; and 2) carrying out a thermal cracking reaction on the atomized mixed acid to obtain phosphorus pentafluoride. The preparation method of phosphorus pentafluoride provided by the invention can improve the purity of the prepared phosphorus pentafluoride, and has the advantages of high reaction efficiency, simple process and the like.

A method for manufacturing phosphorus pentafluoride includes a dehydration step of dehydrating hexafluorophosphate hydrate using sulfuric acid containing less than 5% by mass of sulfur trioxide. Preferably, it also includes steps a) and b). a) a step of concentrating the sulfuric acid after the dehydration step. b) a step of reusing the sulfuric acid concentrated in step a) for the dehydration of hexafluorophosphate hydrate, and then using the sulfuric acid for the manufacture of phosphorus pentafluoride. Preferably, the dehydration step is carried out in the presence of hydrogen fluoride, and step c) is included before step a). c) a step of recovering the hydrogen fluoride after the dehydration step.

The present application relates to the technical field of chemical engineering, and provides a lithium hexafluorophosphate solution, and a preparation method therefor and a device therefor. The method comprises: performing a first contact reaction on a first phosphorus pentafluoride gas and a lithium fluoride solution to obtain a first reaction product; performing a second contact reaction on the first reaction product and a second phosphorus pentafluoride gas to obtain a second reaction product; and performing a third contact reaction on the second reaction product and a third phosphorus pentafluoride gas to obtain the lithium hexafluorophosphate solution. The phosphorus pentafluoride gas is step-fed, such that the feeding ratio of phosphorus pentafluoride to lithium fluoride can be dynamically and accurately controlled; and according to the reaction kinetic characteristics, the reaction process is optimized, and the chemical reaction speed between phosphorus pentafluoride and lithium fluoride is accelerated, so the lithium hexafluorophosphate solution can be efficiently synthesized in a short time, and the purity and the yield of the lithium hexafluorophosphate solution are improved.

The present application relates to the technical field of lithium hexafluorophosphate production, and discloses a lithium hexafluorophosphate purification method and system. The method comprises the following steps: heat-decomposing lithium fluoride-containing lithium hexafluorophosphate powder to obtain a gas mixture containing phosphorus pentafluoride; obtaining phosphorus pentafluoride gas after purification; drying lithium hexafluorophosphate wet product, and then reacting with the phosphorus pentafluoride gas to convert lithium fluoride into lithium hexafluorophosphate, so as to reduce the insoluble content in the product. The system comprises: a ripening gas preparation unit for producing purified phosphorus pentafluoride gas; a main process unit for preparing lithium hexafluorophosphate dry product; and a ripening treatment unit for ripening reaction of the dry product with the phosphorus pentafluoride gas. The present application realizes efficient conversion of lithium fluoride and effective removal of impurities, and improves the purity of lithium hexafluorophosphate.

The application provides a method for preparing sodium hexafluorophosphate for sodium batteries from sodium bifluoride, which comprises the following steps: taking electronic-grade sodium hydroxide and electronic-grade hydrofluoric acid as raw materials to generate an intermediate product sodium fluoride, and then reacting the intermediate product with phosphorus pentafluoride to obtain high-purity sodium hexafluorophosphate for sodium batteries. The particle size distribution and yield of sodium fluoride crystals are controlled by adjusting the stirring rate and cooling conditions, and then the purity and yield of sodium hexafluorophosphate are controlled, so that the purity of the finally obtained sodium hexafluorophosphate can reach more than 99.8%, the yield can reach more than 85%, the sodium hexafluorophosphate has the advantages of low cost and high yield, and is beneficial to industrialized production.

Provided in the present application is a method for preparing phosphorus pentafluoride, comprising: mixing a hexafluorophosphoric acid solution and a dehydrating agent, and then performing a dehydration reaction, the dehydration reaction being performed at 30-160°C under a pressure of 0.1-3 MPa, and the hexafluorophosphoric acid solution containing water and hydrogen fluoride; after the dehydration reaction is completed, performing quick pressure relief on the reaction system to obtain a mixed gas containing phosphorus pentafluoride, the pressure relief rate of the quick pressure relief being greater than or equal to 0.1 MPa / min; and purifying the mixed gas containing phosphorus pentafluoride to prepare phosphorus pentafluoride gas.

The invention provides a treatment method of tail gas containing phosphorus pentafluoride and a preparation method and device of lithium hexafluorophosphate. The treatment method of the tail gas containing phosphorus pentafluoride comprises the following steps: 1) carrying out first absorption treatment on the tail gas containing phosphorus pentafluoride by adopting a first absorption liquid containing lithium fluoride to obtain a first lithium hexafluorophosphate solution and a first mixed gas containing hydrogen fluoride; 2) carrying out first reaction on phosphorus pentachloride and the first mixed gas to obtain second mixed gas containing phosphorus pentafluoride; and 3) carrying out second absorption treatment on the second mixed gas by using a second absorption liquid containing lithium fluoride to obtain a second lithium hexafluorophosphate solution and a third mixed gas containing hydrogen fluoride and hydrogen chloride. According to the treatment method of the tail gas containing phosphorus pentafluoride, provided by the invention, the content of phosphorus pentafluoride in the tail gas can be reduced, and the resource utilization rate is improved.