29 results about "Hexafluoropropylene oxide" patented technology

The invention provides a green and efficient production method of hexafluoropropylene oxide, and belongs to the technical field of synthesis of organic fluorine compounds. The method comprises the following steps: carrying out a continuous oxidation reaction on hexafluoropropylene, oxygen and a perfluoro solvent in an immersed supergravity reactor to generate HFPO and byproducts carbonyl fluoride and trifluoroacetyl fluoride, removing the solvent from the reacted liquid, feeding the liquid into an acyl fluoride rectifying tower, separating low-boiling-point acyl fluoride from the tower top, enriching HFPO, unreacted HFP and a small amount of acyl fluoride from the tower bottom, and carrying out a continuous oxidation reaction on the HFPO and the byproducts carbonyl fluoride and trifluoroacetyl fluoride. Converting acyl fluoride into anhydrous trifluoroacetic acid from a high-boiling-point substance at the bottom of the tower through a hydrolysis tower, carrying out alkali washing on the synthesis gas to obtain an HFPO crude product, and further carrying out drying and extractive distillation to obtain an HFPO product; acyl fluoride rectified by an acyl fluoride rectifying tower is directly used for producing PAVE, and long-chain perfluoroacyl fluoride accumulated in a solvent of oxidation reaction is hydrolyzed to synthesize a non-PFOA emulsifier. The method has the advantages of high HFPO selectivity, short reaction time and high safety; the method realizes resource comprehensive utilization of byproducts, and is environment-friendly and economical.

The invention belongs to the technical field of organic fluorine polymer synthesis, and discloses perfluoropolyether with narrow molecular weight distribution and a preparation method and application thereof.The method comprises the steps that in an aprotic polar solvent, phosphazene organic super base and anhydrous hydrogen fluoride or perfluoroalcohol are mixed according to the molar ratio of 1: 0.5-1: 1.5, and a mixture is obtained; forming in situ a non-metallic active initiation complex containing large-volume counter cations; at the temperature of-50 DEG C to 10 DEG C, introducing a hexafluoropropylene oxide monomer into the initiation system, and carrying out anionic ring-opening polymerization until a preset number-average molecular weight is reached; after polymerization, maintaining a liquid phase, directly adding a perfluoroalkyl sulfonate end-capping reagent, and reacting at 20-80 DEG C to convert an active end group into an inert perfluoroalkyl ether end group; and performing post-treatment to obtain the perfluoropolyether product. The invention solves the problems of wide molecular weight distribution, low safety and high equipment cost in the traditional process, and the product is suitable for semiconductor vacuum pump oil and precise electronic cleaning agent, and has obvious industrial application value.

This invention provides a method and system for preparing trifluoropyruvate esters using a centrifugal method, relating to the field of organofluorine chemical synthesis technology. The centrifugal method for preparing trifluoropyruvate esters includes: circulating and spraying an alcohol-ether solution containing an aldehyde compound and a catalyst in a centrifugal reactor, and introducing hexafluoropropylene oxide to catalyze the reaction between the aldehyde compound and hexafluoropropylene oxide, yielding a reaction product; separating the reaction product into gas and liquid phases, and separating the gas phase product by distillation to obtain trifluoropyruvyl fluoride and hydrofluorocarbons; and esterifying the trifluoropyruvyl fluoride and alcohol in a microchannel reactor to obtain trifluoropyruvate esters. The centrifugal method for preparing trifluoropyruvate esters described in this invention has advantages such as simple and readily available raw materials, mild reaction conditions, and high conversion and yield.

The application discloses a kind of high-efficiency multi-metal catalyst for synthesizing hexafluoropropylene oxide, and belongs to the field of catalyst preparation.The multi-metal catalyst of the application is Cu, Ce, Mo ternary metal catalyst, comprising: 1wt%-5wt% of Cu, 0.5wt%-3wt% of Ce, 0.1wt%-1wt% of Mo and 85wt%-95wt% of phosphoric acid modified mesoporous silica carrier, wherein, Cu is loaded in the form of nanoparticle with particle size of 5-20nm, Ce exists in the form of cerium oxide, and Mo exists in the form of molybdate.The multi-metal catalyst plays catalytic activity through the oxidation activity of Cu 0 , the oxygen storage capacity of CeO2 and the electronic regulation effect of MoO4 2‑ , is suitable for preparing hexafluoropropylene oxide from hexafluoropropylene gas phase oxidation, has high raw material conversion rate, and can reduce reaction temperature.

The invention provides a production process of perfluoropolyether oil, and belongs to the technical field of polymer fluorine materials. The method comprises the following steps: activating a metal fluoride catalyst, an aprotic polar solvent and a cocatalyst in a polymerization reaction kettle, adding hexafluoropropylene oxide to prepare a perfluoropropylene oxide oligomer containing an acyl fluoride end group, and carrying out end group stabilizing treatment on the oligomer by using a fluorinating reagent. And carrying out reduced pressure distillation on the obtained product, treating with an adsorbent, and dehydrating to obtain the perfluoropolyether oil. According to the method, the solubility of the hexafluoropropylene oxide and the catalyst is improved, the conversion rate of the hexafluoropropylene oxide is improved, and the yield of the product is increased.

This invention belongs to the field of perfluoropentanone preparation technology, specifically relating to a continuous production process for perfluoropentanone. The continuous production process for perfluoropentanone includes the following steps: a fluorination catalyst is loaded into a reaction tube, purged with nitrogen, and a preheated mixture of hexafluoropropylene and trifluoroacetyl fluoride is introduced into the reaction tube for continuous reaction. Part of the reacted gas is condensed to obtain the target product, perfluoropentanone, while the other part is recycled back to the mixing and preheating stage. This continuous production process for perfluoropentanone uses hexafluoropropylene and trifluoroacetyl fluoride as raw materials, and employs a one-step gas-phase continuous flow method to rapidly synthesize perfluoropentanone under the action of a MgF2-based fluorination catalyst. No solvent is required, and the trifluoroacetyl fluoride raw material is a byproduct of the preparation of hexafluoropropylene oxide, making the raw materials readily available. The process route is simple, with high conversion rate and high selectivity, facilitating large-scale industrial production.

The invention discloses a fluorinated metal organic framework material as well as a preparation method and application thereof, and belongs to the technical field of metal organic framework materials. Under the condition of room temperature, adding the deprotonation agent solution into the 2-trifluoromethylimidazole solution, uniformly mixing, and dropwise adding the zinc salt solution into the mixed solution under vigorous stirring; and after dropwise adding is finished, continuously stirring and reacting, and then standing, centrifuging, washing and drying in vacuum to obtain the fluorinated metal organic framework material. The fluorinated metal organic framework material prepared by the invention is based on an F-F non-covalent interaction mechanism, and can directly realize high-efficiency adsorption of long-chain perfluorinated and polyfluoroalkyl substances (PFAS) in a neutral water body under the condition that the salinity does not need to be adjusted. The maximum adsorption capacities of the material to PFOA (perfluorooctanoic acid), PFOS (perfluorooctanoic acid), PFNA (perfluorooctanoic acid), PFNS (perfluorooctanoic acid) and HFPO-TeA (hexafluoropropylene oxide-TeA) respectively reach 529.64 mg / g, 585.33 mg / g, 1135.18 mg / g, 1346.72 mg / g

The invention discloses a method for preparing perfluorooxapropionyl fluoride with high selectivity and high purity and application thereof, and belongs to the technical field of fluorine-containing compounds, the method comprises the following steps: adding a mixed solvent of a fluorine-containing benzene solvent and an ether solvent and an alkali metal fluoride catalyst into a reaction kettle, and stirring for 10-30 minutes at-40-0 DEG C for pretreatment activation; then gaseous perfluoroacyl fluoride and gaseous hexafluoropropylene oxide are introduced into a reaction kettle for a ring-opening reaction, a reaction solution is obtained, and the reaction solution contains liquid perfluorooxapropionyl fluoride; and rectifying the reaction liquid to obtain a pure product of the perfluorooxapropionyl fluoride. The method is simple in process and low in equipment requirement, the boiling point difference between the used ether solvent and the fluorine-containing benzene solvent and the polymerization product is large, separation is convenient, the solvent can be reused after purification, the product selectivity of the method is larger than or equal to 92%, the purity of the obtained perfluorinated oxapropionyl fluoride is larger than or equal to 99.4%, and the effect is excellent.

This application discloses a quantitative detection method for a mixture of hexafluoropropylene oxide and hexafluoropropylene, characterized by the following steps: 1) establishing standard curves for methyl pentafluoropropionate and hexafluoropropylene using standards; 2) isomerizing the hexafluoropropylene oxide in the mixture to obtain methyl pentafluoropropionate; 3) detecting methyl pentafluoropropionate and hexafluoropropylene separately, substituting the results into the standard curves to obtain their contents; and then converting the content of methyl pentafluoropropionate into the content of hexafluoropropylene oxide. The method provided in this application features mild reaction conditions and simple operation, solving the problem of difficult separation of hexafluoropropylene oxide and hexafluoropropylene mixtures in the gas phase, and enabling rapid separation and quantitative detection of hexafluoropropylene oxide and hexafluoropropylene.

A simple, safe, and industrially feasible method for manufacturing trifluoroacetyl fluoride (TFAF) and carbonyl fluoride (COF2) is provided. One method for manufacturing trifluoroacetyl fluoride and carbonyl fluoride comprises the following steps: introducing at least one reactant selected from hexafluoropropylene and hexafluoropropylene oxide with oxygen and a diluent compound into a reactor to obtain a product gas containing trifluoroacetyl fluoride and carbonyl fluoride.

The application provides a method for preparing hexafluoropropylene oxide dimer and pentafluoropropionic acid through photocatalytic telomerization, and relates to the technical field of organic synthesis, and comprises the following steps: performing photocatalytic reaction on a rectification residue of hexafluoropropylene oxide dimer to continuously pyrolyze and telomerize, so that hexafluoropropylene oxide dimer and pentafluoropropionic acid are obtained; the components of the rectification residue include hexafluoropropylene oxide polymer CF3CF2CF2O[CF(CF3)CF2O] n CF(CF3)COF, n=0~5; the catalyst used in the photocatalytic reaction comprises alkali metal fluoride loaded on activated carbon. The application resources the hexafluoropropylene oxide polymer to hexafluoropropylene oxide dimer and pentafluoropropionic acid through telomerization, so that by-product waste liquid is fully resourced, and the application has the advantages of green economy; meanwhile, the reaction condition is mild, the conversion rate is high, the yield is high, the time is short, and the application is easy to industrialize.

The invention discloses a synthetic method of perfluoroalkoxy methylene vinyl ether, which comprises the following steps of: 1, reacting alkyl fluoroformate with halogenated olefin under the action of an auxiliary agent to generate halogenated alkyl ether, and performing dehalogenation reaction to generate perfluoroalkoxy methylene vinyl ether; the method II comprises the following steps: reacting alkyl fluoroformate with hexafluoropropylene oxide under the action of an auxiliary agent to generate alkoxy propionyl fluoride, and carrying out salification and decarboxylation reaction to generate perfluoroalkoxy methylene vinyl ether (RfOCF2OCF = CF2); the auxiliary agent is metal fluoride or fluoro quaternary ammonium salt. In the first method and the second method, the alkyl fluoroformate and the halogenated olefin or the hexafluoropropylene oxide need to react under the action of the aid (metal fluoride or fluoro quaternary ammonium salt), so that the safety problem caused by direct use of fluorine gas is avoided, and the conversion rate of the trifluoromethyl fluoroformate and the yield and selectivity of the product can be improved.

The invention relates to the technical field of organic pollutant wastewater treatment, and discloses a method for degrading perfluorooctanoic acid and a substitute thereof by electrochemically activating sulfate radicals, in an electrochemical reaction device, a Pt / CeO2 (at) Ti4O7 electrode is used as an anode, a 304 stainless steel sheet is used as a cathode, and a reaction solution in the electrochemical reaction device comprises a to-be-degraded substance, an electrolyte and deionized water; under the action of an external direct-current electric field, the to-be-degraded object is subjected to electrochemical degradation; the to-be-degraded product is perfluorooctanoic acid and / or hexafluoropropylene oxide dimer acid. The Pt / CeO2 (at) Ti4O7 electrode can effectively degrade perfluorooctanoic acid and hexafluoropropylene oxide dimer acid in water under the action of an external electric field, and development of an effective treatment method for the environment polluted by perfluorinated substances is promoted.

The invention discloses a high-performance polypropylene derivative for a packaging material and a preparation method of the high-performance polypropylene derivative, and relates to the technical field of plastics. The high-performance polypropylene derivative for the packaging material prepared by the invention comprises a modified polypropylene base material, a cycloolefin copolymer, a nucleating agent and intercalated montmorillonite, the modified polypropylene resin base material is prepared by melt blending of polypropylene and polyamide siloxane; polypropylene and a polymer with amide and siloxane are subjected to melt blending, so that the toughness and the antistatic property are improved while the scraping property is ensured. The intercalated montmorillonite is prepared from an acrylate polymer and montmorillonite through a reaction, the acrylate polymer is prepared from N-vinyl pyrrolidone and perfluoroepoxy methacrylate through a reaction, and the perfluoroepoxy methacrylate is acyl fluoride functionalized hexafluoropropylene oxide prepared through ring opening oligomerization of hexafluoropropylene oxide; according to the present invention, the toughness is improved, and the barrier property of the polypropylene derivative is enhanced at the same time.

The invention belongs to the technical field of preparation of perfluoropentanone, and particularly relates to a continuous production process of perfluoropentanone. The continuous production process of the perfluoropentanone comprises the following steps: filling a reaction tube with a fluorination catalyst, purging with nitrogen, introducing a mixed gas of hexafluoropropylene and trifluoroacetyl fluoride which are mixed and preheated into the reaction tube for continuous reaction, and partially condensing the reacted gas to obtain the target product perfluoropentanone, and the other part returns to the mixing and preheating stage through circulation. According to the continuous production process of the perfluoropentanone, hexafluoropropylene and trifluoroacetyl fluoride are taken as raw materials, under the action of the MgF2-based fluorination catalyst, the perfluoropentanone is rapidly synthesized by adopting a one-step gas phase continuous flow method, a solvent does not need to be introduced, the raw material trifluoroacetyl fluoride is taken from a by-product of hexafluoropropylene oxide, the raw materials are easy to obtain, the process route is simple, the production cost is low, and the production process is suitable for industrial production. The conversion rate is high, the selectivity is high, and industrial large-scale production is easy.

The present application relates to the technical field of fine chemical industry, in particular to a kind of perfluoro-2-alkyloxy propionyl fluoride and preparation method thereof, in the presence of polar aprotic solvent, using metal fluoride supported on support agent to catalyze acyl fluoride and hexafluoroepoxy propane reaction, perfluoro-2-alkyloxy propionyl fluoride is obtained.The present application utilizes the loading performance of support agent, metal ion in metal fluoride is fixed, it is beneficial to fluorine ion to be free, increase oligomerization reactivity, without adding phase transfer catalyst, the high yield, high efficiency preparation of perfluoro-2-alkyloxy propionyl fluoride can be realized.

The invention discloses a zinc-based modified molecular sieve adsorbent for removing hexafluoropropylene oxide in trifluoroacetyl fluoride and a preparation method of the zinc-based modified molecular sieve adsorbent, and belongs to the technical field of fluorine-containing fine chemical purification and multi-phase adsorption materials. Comprising the following steps: (1) soaking a molecular sieve carrier in an ammonium fluoride aqueous solution for treatment; (2) dispersing the product in the step (1) in absolute ethyl alcohol, and adding methyltrimethoxysilane for reaction to obtain a pretreated molecular sieve; (3) putting the pretreated molecular sieve into a zinc source aqueous solution, and stirring for reaction; (4) roasting the dried product in an air atmosphere; and (5) cyclically carrying out the steps (1)-(4) for 1-5 times to obtain a finished product. The adsorbent provided by the invention has the advantages of good thermal stability, excellent regeneration performance, template-free synthesis, low cost and the like, and is suitable for an industrial continuous adsorption process environment for purifying electronic-grade trifluoroacetyl fluoride.

The present application relates to fluorine chemical technology field, disclose a kind of hexafluoropropylene oxide and hexafluoropropylene separation process, with fluorine-containing solvent as extractant, using extraction rectification column and desorption rectification column simultaneous to the mixture containing hexafluoropropylene oxide and hexafluoropropylene is extracted rectification, realize the separation of hexafluoropropylene oxide and hexafluoropropylene.The present application uses fluorine-containing solvent as extractant, using extraction rectification technology will hexafluoropropylene oxide and hexafluoropropylene effectively separate, and then obtain high-purity hexafluoropropylene oxide product and hexafluoropropylene product.The fluorine-containing solvent used in the present application is not only environment-friendly, extraction effect is obvious, and high stability, even if hexafluoropropylene oxide product and hexafluoropropylene product entrain small amount of extractant, its subsequent application development influence is also smaller.

The invention provides a synthesis method of hydrofluoroether, which comprises the following steps: A) performing ozone cracking, separation and purification on a hexafluoropropylene dimer to obtain perfluoroalkyl acyl fluoride; the perfluoroalkyl acyl fluoride comprises trifluoroacetyl fluoride, pentafluoropropionyl fluoride, heptafluoroisobutyryl fluoride and trifluoromethyl fluoroformate; the perfluoroalkyl acyl fluoride comprises trifluoroacetyl fluoride, pentafluoropropionyl fluoride, heptafluoroisobutyryl fluoride and trifluoromethyl fluoroformate; b) reacting the perfluoroalkyl acyl fluoride with hexafluoropropylene oxide to obtain perfluoro-2-alkoxy propionyl fluoride as shown in a formula (I-1) or a formula (I-2); and C) reacting the perfluoro-2-alkoxy propionyl fluoride with an alkylating reagent to obtain the hydrofluoroether shown as a formula (II-1) or a formula (II-2). According to the method, the hexafluoropropylene dimer (HFPD) is subjected to ozone oxidative cracking to prepare the perfluoroalkyl acyl fluoride, and the perfluoroalkyl acyl fluoride further reacts with the HFPO to obtain the perfluoro-2-alkoxy propionyl fluoride, so that the reaction conditions are mild, the process is simple, and the method is safe and reliable; reaction selectivity is good, by-products are few, products are easy to separate, and yield is high.

The invention provides a method for preparing perfluoromethyl vinyl ether, which comprises the following steps: carrying out ozone cracking reaction by using perfluoroolefin as a raw material, and separating and purifying to obtain trifluoromethyl fluoroformate, the preparation method comprises the following steps: reacting trifluoromethyl fluoroformate with hexafluoropropylene oxide to obtain perfluoro-2-methoxypropionyl fluoride, and further carrying out pyrolysis decarboxylation on the perfluoro-2-methoxypropionyl fluoride to obtain the perfluoromethyl vinyl ether. The method for preparing trifluoromethyl fluoroformate through ozone oxidative cracking of perfluoroolefin is mild in reaction condition, good in selectivity, simple in process, safe and reliable, the product is easy to separate, and the yield is high. Other products related in the process, such as trifluoroacetyl fluoride and heptafluoroisobutyryl fluoride, are also very important industrial intermediates which are difficult to obtain; the trifluoromethyl fluoroformate is used for replacing carbonyl fluoride to prepare perfluoro-2-methoxypropionyl fluoride, so that the defects that carbonyl fluoride is high in toxicity and has potential safety hazards in production and use are overcome, and the whole process of PMVE is safe and reliable.

The invention belongs to the technical field of organic fluorine fine chemicals, and particularly relates to a preparation method of perfluoro-n-propyl vinyl ether. The preparation method comprises the following steps: continuously adding a certain amount of hexafluoropropylene oxide dimer into a reaction system at normal temperature in a fully dehydrated organic ether solvent by taking dry carbonate as a salt-forming agent and organic amine and / or metal salt as a catalyst, and carrying out salt-forming reaction at proper stirring speed and temperature after charging is completed; after the salt is fully formed, raising the temperature in the kettle, and introducing nitrogen to carry out decarboxylation reaction, so as to obtain a perfluoro-n-propyl vinyl ether product. The method provided by the invention has the advantages that the product yield is high, the decarboxylation time is short, the content of impurity perfluoroisopropyl vinyl ether is low, no solvent is taken out in the decarboxylation process, and the like; meanwhile, the method is simple in process and equipment, easy to operate, low in decarboxylation temperature, low in energy consumption and suitable for large-scale industrial production.

The invention relates to a preparation method of perfluoro-n-propyl vinyl ether, which comprises the following steps: reacting hexafluoropropylene oxide with potassium fluoride to obtain potassium perfluoropropoxide; the preparation method comprises the following steps: reacting potassium perfluoropropoxide with tetrafluoroethylene to obtain the perfluoro-n-propyl vinyl ether. According to the preparation method of the perfluoro-n-propyl vinyl ether, generation of by-products is effectively reduced, the purity and the yield of the product are remarkably improved, the production cost is reduced, and the economic benefit is improved; by-products generated in the reaction process are few in variety and easy to separate, the post-treatment process is simple, complicated rectification and purification steps are not needed, the production procedures and time are reduced, and meanwhile, the problems of product loss and environmental pollution caused by the post-treatment process are also reduced; in addition, the reaction conditions are mild, the requirements on reaction equipment are reduced, the equipment investment and operation cost are reduced, meanwhile, the safety and stability of the production process are also improved, and large-scale industrial production is facilitated.

The invention belongs to the technical field of organic fluorine chemical industry, and particularly relates to a preparation method of perfluoroalkyl vinyl ether. Adding the compound catalyst into a tubular reactor, introducing hexafluoropropylene and O2, raising the temperature, controlling the pressure, and carrying out a continuous reaction to obtain a mixed gas of hexafluoropropylene oxide, carbonyl fluoride and trifluoroacetyl fluoride; introducing the mixed gas into a tubular reactor containing a compound catalyst, and carrying out addition reaction to obtain an acyl fluoride intermediate; and adding solid alkali metal carbonate into the tubular reactor, heating, introducing the acyl fluoride intermediate, carrying out a decarboxylation reaction to obtain a crude perfluoroalkyl vinyl ether product, and carrying out rectification purification to obtain the perfluoroalkyl vinyl ether. The compound catalyst is a homogeneous mixture of a difluoro ion solvent, strong acid and alkali metal fluoride. The tubular reactor and the compound catalyst cooperate to realize continuous preparation of the perfluoroalkyl vinyl ether, the conversion rate and selectivity are remarkably improved, and the method is suitable for industrial amplification.

The invention discloses a synthesis method of nonafluoroisobutyl methyl ether, which comprises the following steps: by taking hexafluoropropylene oxide and fluoromethane as raw materials, enabling fluorine to be bionic into nucleophilic trifluoromethyl negative ions (CF3-) under an alkaline condition, and in the presence of an amide compound, enabling the CF3-to attack amide carbonyl carbon to form oxygen negative ions (CF3CR (H) NR1R2O-), then, the intermediate attacks carbon with high electrophilicity in hexafluoropropylene oxide, hexafluoropropylene oxide is subjected to a ring-opening reaction, perfluoroisobutyryl fluoride is generated, and a part of sub-amide is generated; then, acyl fluoride is subjected to nucleophilic addition and methylation through fluorine ions, and finally synthesis of the nonafluoroisobutyl methyl ether is completed. The method realizes resource utilization of the fluorine imitation waste, and has the advantages of high conversion efficiency, mild reaction conditions and simple operation flow.

Provided is a method of producing perfluoro(2,4-dimethyl-2-fluoroformyl-1,3-dioxolane, the method having a dimer reaction step of reacting a trifluoropyruvic acid fluoride dimer with hexafluoropropylene oxide in an organic solvent in the presence of one or more fluorides selected from the group consisting of potassium fluoride and sodium fluoride to obtain perfluoro(dimethyl-2-oxo-1,4-dioxane).

The invention relates to the technical field of lithium ion batteries, in particular to a cobalt-free lithium-rich manganese-based positive electrode material, a preparation method thereof, a positive plate and a lithium ion battery. The preparation method comprises the following steps: mixing a lithium source, a nickel-manganese precursor and a dopant, and performing first sintering to obtain an REE-doped intermediate material; doping elements in the dopant at least comprise Ce and La elements, and further comprise at least one of Sc, Y and Dy elements; and mixing the intermediate material with a fluorine-containing organic matter, and carrying out second sintering to obtain the cobalt-free lithium-rich manganese-based positive electrode material with the F / C coating layer, the fluorine-containing organic matter comprises at least one of polytetrafluoroethylene, chlorotrifluoroethylene, hexafluoropropylene oxide and hexafluoropropylene. According to the method, the first-circle charge-discharge efficiency and charge-discharge specific capacity of the cobalt-free lithium-rich manganese-based positive electrode material can be improved, the voltage attenuation is remarkably reduced, and the cycle performance is obviously improved.

The present application relates to the preparation of hexafluoropropylene oxide, disclose a kind of based on metal synergistic effect can be used for the continuous preparation of hexafluoropropylene oxide in gas phase bimetallic oxide solid acid catalyst, using hexafluoropropylene and oxygen as raw material, with Cu oxide as the first active center, loading is 0.5-5wt%, Ce, Co, Cr oxide as the second active center, loading is 0.1-5wt% and does not exceed the loading of Cu, solid acid is the carrier of multimetallic oxide system as catalyst, can realize the continuous preparation of hexafluoropropylene oxide.The present application utilizes the bimetallic synergistic effect and the specific acid sites of solid acid, greatly improves the reaction activity of catalyst.The method involved in the present application does not involve the use of solvent reduces the difficulty of post-processing, greatly reduces the temperature and pressure required for reaction.

The invention discloses a preparation method of perfluorosulfonyl vinyl ether, which can be continuously operated, is beneficial to industrial production, and comprises the following steps: (1) taking tetrafluorosultone and hexafluoropropylene oxide as raw materials, and continuously reacting in a solvent-catalyst-assistant reaction system by a fractional step method to prepare an intermediate acyl fluoride; (2) reacting the intermediate acyl fluoride with sodium carbonate in a solvent to obtain a salt solution; and (3) continuously feeding the salt solution into a decarboxylation reactor for decarboxylation, and purifying the reaction product to obtain the perfluorosulfonyl vinyl ether.