51 results about "Hexafluoropropylene oxide" patented technology

The invention discloses a continuous synthesis and purification method of hexafluoropropylene oxide, which comprises the following steps: introducing hexafluoropropylene, oxygen and a fluorine-containing solvent into a supergravity reactor to carry out oxidation reaction at the reaction temperature of 100-200 DEG C under the reaction pressure of 1.0-2.5 Mpa for 10-120 seconds, and after the reaction is finished, overflowing and leading out reaction liquid to obtain the hexafluoropropylene oxide. And purifying to obtain the hexafluoropropylene oxide. According to the method, the problems of mass transfer and heat transfer can be effectively solved by using the supergravity reactor, the reaction selectivity is remarkably improved, meanwhile, the productivity is effectively improved, and the supergravity reactor is combined with extractive distillation treatment, so that the conversion rate of the hexafluoropropylene reaches 79% or above, the selectivity of the hexafluoropropylene oxide is 85% or above, and the purity of the hexafluoropropylene oxide after extractive distillation reaches 99%. The invention further discloses a device used in the continuous synthesis and purification method, and cyclic utilization of hexafluoropropylene and the fluorine-containing solvent can be achieved.

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 discloses a synthesis method of low-molecular-weight perfluoropolyether acyl fluoride, which comprises the following steps: hexafluoropropylene, oxygen, a catalyst and a fluorine-containing solvent are subjected to an oxidative polymerization reaction, the reaction liquid is subjected to light component removal and solvent removal to obtain the low-molecular-weight perfluoropolyether acyl fluoride, and the temperature of the oxidative polymerization reaction is 130-300 DEG C. According to the invention, hexafluoropropylene is used as a raw material and is oxidized by oxygen in a fluorine-containing solvent, so that low-component perfluoropolyether acyl fluoride is synthesized in one step. In the presence of a catalyst, formyl fluoride, trifluoroacetyl fluoride and hexafluoropropylene oxide continue to be added into an oligomer, and the oligomer is mainly perfluoropolyether acyl fluoride with a straight-chain structure. And when the reaction temperature is within the range, the smooth proceeding of the oxidative polymerization reaction can be ensured, the sharp rise of the reaction pressure caused by the overhigh reaction temperature can be avoided, and the model selection of reaction equipment is convenient.

The present invention provides a method for simply, safely and industrially producing trifluoroacetyl fluoride (TFAF) and carbonyl fluoride (COF2).　This method for producing trifluoroacetyl fluoride and carbonyl fluoride includes a step for introducing at least one reactant selected from the group consisting of hexafluoropropylene and hexafluoropropylene oxide, and oxygen and a diluent compound into a reactor to obtain a product gas containing trifluoroacetyl fluoride and carbonyl fluoride.

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 invention discloses a method for preparing perfluoropolyether with different molecular weights by a formula type solvent, and belongs to the technical field of perfluoropolyether preparation, the method comprises the following steps: mixing one or more hydrofluoroethers, an aprotic polar solvent and a catalyst, adding the mixture into a reaction kettle, introducing hexafluoropropylene oxide for polymerization until the reaction temperature reaches 25 + / -2 DEG C, and stopping the reaction to obtain the perfluoropolyether, the polymerization yield is greater than 95%; and controlling the type and ratio of the added hydrofluoroether to obtain perfluoropolyether with different molecular weights. The perfluoropolyether has the beneficial effects that the perfluoropolyether with specific molecular weight is prepared by combining different types of hydrofluoroethers with different proportions with other system compounds in the formula, and the perfluoropolyether is high in reaction yield, safe, environment-friendly, mild in condition and simple in process and can be widely applied in industry.

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 preparation method of bisphenol AF, and relates to the field of fluorine-containing organic matters. The preparation method comprises the following specific steps: adding hydrogen fluoride, hexafluoropropylene and hexafluoropropylene oxide into a stainless steel reaction kettle 1, heating and carrying out an isomerization reaction to obtain hexafluoroacetone; and 2, introducing the hexafluoroacetone generated in the step 1 into a stainless steel reaction kettle 2, then adding phenol and a catalyst, carrying out a heating reaction, and after the reaction is finished, carrying out rectification to remove hydrogen fluoride and hexafluoropropylene so as to obtain bisphenol AF. The purity and the yield of the bisphenol AF product prepared by the method are improved, and the process economy is effectively improved.

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 belongs to the technical field of fluorine-containing modified monomer preparation, and particularly relates to a preparation method and a preparation device of perfluoromethyl vinyl ether. The preparation method comprises the following steps: (1) adding a catalyst and a solvent into a reaction kettle, and uniformly stirring to obtain a catalyst solution; introducing carbonyl fluoride gas into the catalyst solution, and then dropwise adding hexafluoropropylene oxide liquid into the catalyst solution in a liquid phase to carry out an addition reaction, so as to obtain an intermediate product perfluoro-2-methoxypropionyl fluoride; wherein the catalyst comprises potassium fluoride and cesium fluoride, and the mass ratio of the potassium fluoride to the cesium fluoride is (10-20): 1; (2) dropwise adding a liquid phase of the intermediate product perfluoro-2-methoxypropionyl fluoride into a mixed solution of carbonate and a solvent, and carrying out a salt-forming cracking reaction to obtain a crude product of perfluoromethyl vinyl ether; according to the preparation method and the preparation device, the yield of the perfluoromethyl vinyl ether can reach 90% or above, and the preparation method and the preparation device are suitable for industrial production.