43 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 field of fluorine chemical industry, and particularly relates to a preparation method of a hexafluoropropylene oxide oligomer, which comprises the following steps: adding a solvent and a catalyst into a stirring reactor with a proper length-diameter ratio, and introducing hexafluoropropylene oxide in a stirring state; a valve is arranged at the bottom of the stirring reactor, and when the fluorine phase liquid level at the bottom of the stirring reactor is increased to a certain height, the bottom valve is opened; controlling the bottom liquid outlet rate to keep the height of the reaction liquid stable; and after the reaction is finished, collecting a component flowing out of a valve at the bottom, namely the hexafluoropropylene oxide oligomer. The method has the beneficial effects that the operation is simple, the product is easy to separate from the solvent and the catalyst, and large-scale production is easy.

The invention belongs to the technical field of organic fluorine chemical industry, and particularly relates to hexafluoropropylene oxide as well as a synthesis method and a synthesis device thereof. The synthetic method of the hexafluoropropylene oxide comprises the following processes: firstly, heating dimethyl sulfide and monochlorodifluoromethane in a solvent for reaction, then adding the obtained intermediate into a sodium hydride solution at 30-50 DEG C for reaction to obtain a reaction solution, finally, adding trifluoroacetyl fluoride into the reaction solution for reaction at 15-30 DEG C, treating the obtained reaction solution, and finally, separating and purifying to obtain the hexafluoropropylene oxide. The hexafluoropropylene oxide is obtained. And recovering the solvent and dimethyl sulfide. The synthesis method of hexafluoropropylene oxide provided by the invention is mild in reaction condition and stable in reaction, the synthesized hexafluoropropylene oxide is high in yield and high in purity, and the invention also provides a synthesis device of hexafluoropropylene oxide, which is low in energy consumption.

The invention discloses a bimetallic catalyst for high-selectivity preparation of hexafluoropropylene oxide and application of the bimetallic catalyst, and belongs to the field of catalysts. The active component of the bimetallic catalyst disclosed by the invention is gold-palladium (Au-Pd) alloy nanoparticles loaded on an anatase type TiO2 carrier. Wherein the molar ratio of Au to Pd is (1: 1)-(3: 1), the Au-Pd alloy can give full play to the unique electronic effect within the proportion range, namely, the d-band center of Pd moves downwards, Au is in an electron enrichment state, and the Au-Pd alloy and the Au are in a synergistic effect, so that the oxygen adsorption and activation capacity is remarkably optimized. When the catalyst is applied to preparation of HFPO through HFP gas-phase catalytic oxidation, the bottlenecks of low conversion rate and selectivity, severe reaction conditions and short catalyst life in the prior art can be overcome, and technical support is provided for green and efficient industrial production of HFPO.

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.

The purpose and the problem of the present invention are to provide a rearrangement preventing agent, particularly a rearrangement preventing agent for suppressing rearrangement of a fluorine-containing cyclic ether compound such as hexafluoropropylene oxide, or the like. The above-described problem can be solved by a rearrangement inhibitor for hexafluoropropylene oxide containing a compound represented by formula (2) [in the formula, L represents a methylene group or the like, and R2a, R2b, R2c, and R2d are the same or different and each represents a hydrogen atom or the like. Wherein one or two of R2a, R2b, R2c and R2d may be the same or different and each represents a C1-C4 alkyl group, and the others represent a hydrogen atom. ]. # imgabs0 #

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.

The present disclosure provides, for example, a method that can produce a fluorolactone compound from hexafluoropropylene oxide or the like in a single step. The present disclosure relates to a method for producing a compound represented by formula (1):wherein two R1 are the same and each is a fluorine atom or a fluoroalkyl group,the method comprising step A of reacting a compound represented by formula (2):wherein R1 is as defined above, with a compound (3) represented by formula (3-1) or the like:wherein R31, R32, and R33 are the same or different and each is a hydrogen atom or a C1-10 alkyl group, or two of them are optionally linked to each other to form a ring optionally having one or more substituents,in the presence of a fluorine compound (4) represented by formula (4-1) or the like:MHnFm  (4-1)wherein M is a metal atom, n is 0 or 1, and the sum of the valence number of M and n is m, andan organic solvent, provided that the compound represented by formula (3) is excluded from the organic solvent.

The invention discloses a method for co-producing trifluoroacetic acid by using synthesis gas rich in acyl fluoride, and belongs to the field of fluorine chemical industry. According to the method, the acyl fluoride-rich waste gas generated during upstream synthesis of hexafluoropropylene oxide (HFPO) is used as a raw material for hydrolysis reaction, so that the raw material cost is greatly reduced, and the economic competitiveness is improved; meanwhile, the hydrolysis process is enhanced by utilizing a supergravity reactor, the reaction efficiency is improved, trace removal of acyl fluoride in the synthesis gas is realized, the acyl fluoride in the synthesis gas can be effectively recycled, and the downstream separation difficulty is reduced on the premise of not influencing the downstream process and product purity of HFPO; according to the present invention, by reasonably controlling the water consumption and adopting the gradient purification mode, the generation of the azeotrope of trifluoroacetic acid and water is avoided, the separation cost is reduced, and the high-purity anhydrous trifluoroacetic acid can be obtained.

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.

The application discloses a method for co-producing trifluoroacetic acid by using acyl fluoride-rich synthesis gas, and belongs to the field of fluorine chemical industry. The application uses the acyl fluoride-rich waste gas generated in the upstream synthesis of hexafluoropropylene oxide (HFPO) as raw material to carry out a hydrolysis reaction, greatly reduces the raw material cost, and improves the economic competitiveness; meanwhile, the hydrolysis process is intensified by using a supergravity reactor, the reaction efficiency is improved, and the trace removal of acyl fluoride in the synthesis gas is realized; the method can effectively recycle and utilize the acyl fluoride in the synthesis gas, reduces the difficulty of downstream separation under the premise of not affecting the downstream process and product purity of HFPO; the application avoids the generation of the azeotrope of trifluoroacetic acid and water by reasonably controlling the water consumption and adopting a gradient purification mode, reduces the separation cost, and high-purity anhydrous trifluoroacetic acid can be obtained.

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 present invention provides a method for efficiently extracting and distilling hexafluoropropylene oxide and hexafluoropropylene, and belongs to the field of fluorine chemical separation technology. The present invention uses 1,2-dichloroethane and ethylene glycol dimethyl ether with a mass ratio of 1:0.5~1:2 as a composite extractant, extracts and distills a mixture containing hexafluoropropylene oxide and hexafluoropropylene, obtains hexafluoropropylene oxide from the top of an extractive distillation tower, and the bottom material of the extractive distillation tower enters a solvent regeneration tower, separates hexafluoropropylene from the composite extractant, obtains hexafluoropropylene from the top of the solvent regeneration tower, and obtains a composite extractant at the bottom and circulates directly to the composite extractant injection port on the top of the extractive distillation tower. The hexafluoropropylene oxide purity of the method is ≥99.7%, and the hexafluoropropylene recovery rate is ≥99.0%; Compared with a single solvent system, the theoretical plate number is reduced by more than 50%, and steam consumption is reduced by more than 30%; Performance decay of the composite extractant is <2.0% after 30 cycles.

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 present application proposes an AF coating method, which relates to the field of coating. An AF coating method includes the following steps: after polishing the surface of the substrate, first clean it with an ethanol solution, take it out and dry it, and then sputter clean it to obtain a treated substrate; weigh fluoroalkyl modified polysiloxane, polyhexafluoropropylene oxide monomethanol, hydrofluoroether and dibutyl tin dilaurate, mix and stir the fluoroalkyl modified polysiloxane, polyhexafluoropropylene oxide monomethanol and hydrofluoroether, heat and heat, add dibutyl tin dilaurate, stir and react to obtain a treated material 1; add the treated material 1 dropwise on the treated substrate, dry it, fill the coating chamber with oxygen and argon, coat the substrate with a silicon dioxide film, a zirconium oxide film and a silicon dioxide film, spray a polytetrafluoroethylene solution on the silicon dioxide film; and dry the substrate. The film layer coated by this method has a low process cost and the coated film layer has better advantages in hydrophobicity, oleophobicity, scratch resistance and fingerprint resistance than the traditional AF coating process.

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 discloses an efficient multi-metal catalyst for synthesizing hexafluoropropylene oxide, and belongs to the field of catalyst preparation. The multi-metal catalyst is a Cu, Ce and Mo ternary metal catalyst and comprises 1 wt%-5 wt% of Cu, 0.5 wt%-3 wt% of Ce, 0.1 wt%-1 wt% of Mo and 85 wt%-95 wt% of a phosphoric acid modified mesoporous silica carrier, the Cu is loaded in the form of nanoparticles with the particle size of 5-20 nm, the Ce exists in the form of cerium oxide, and the Mo exists in the form of molybdate. According to the multi-metal catalyst, the catalytic activity is achieved through coordination of the oxidation activity of Cu0, the oxygen storage capacity of CeO2 and the electronic regulation and control effect of MoO4 < 2->, the multi-metal catalyst is suitable for preparing hexafluoropropylene oxide through hexafluoropropylene gas-phase oxidation, the high raw material conversion rate is achieved, and the reaction temperature can be reduced.

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.