210 results about "Hexafluoropropylene oxide" patented technology

An electrode and a battery coverable of improving cycle characteristics by forming an effective coat are provided. A cathode (21) and an anode (22) are wound with a separator (23) impregnated with an electrolytic solution inbetween. On the surface of the cathode (21) or the anode (22), a coat containing a compound, which has a smaller surface tension than of the electrolytic solution and is insoluble into the electrolytic solution, specifically, a coat containing siloxane such as poly (dimethyl siloxane), poly (methyl hydro siloxane), and poly (methyl phenyl siloxane), or perfluoro polyether such as poly (hexafluoro propylene oxide), or perfluoro alkane such as perfluoro pentadecane is provided. Thereby, without using a great deal of the compound for forming the coat, the coat effective to inhibit decomposition reaction of the electrolytic solution is formed.

Fluoroelastomers are disclosed which have a glass transition temperature less than −10° C. The elastomers contain copolymerized units of a perfluorovinylpolyether that is derived from a trimer or tetramer of hexafluoropropylene oxide.

The invention relates to a method for producing hexafluoropropane oxide and coproducing perfluorovinyl ether, which comprises the following steps of: performing reaction of oxidizing hexafluoropropylene to synthesize the hexafluoropropylene oxide to obtain mixed gas, introducing the mixed gas into a coarse fractionating tower, and rectifying and purifying the separated heavy component to obtain hexafluoropropylene oxide; making the separated light component enter a rectifying tower to remove non-condensable gas to obtain mixed gas of fluorophosgene and perfluacetylfluoride, and introducing the hexafluoropropylene oxide for polymerization to obtain a corresponding perfluoroalkylpolyether mixture; in the presence of sodium carbonate, performing cracking reaction at the temperature of between 150 and 300 to obtain a perfluorovinyl ether mixture; and separating by using the rectifying tower to respectively obtain three kinds of perfluorovinyl ether, namely PMVE, PEVE, PPVE. The method fulfills the aim of producing the hexafluoropropane oxide, and fully utilizes a byproduct, namely perfluorovinyl ether with high added-value generated by the reaction, and has the advantages of reasonable process and industrial application.

The invention discloses an environmental protection method for preparing hexafluropropylene oxide from hexafluoropropylene by dioxygen liquid phase oxidation method. The method employs at least one supercritical fluid as solvent for replacing the CFCs with destructive effect to atmospheric ozone layer. The supercritical fluid as solvent is used in the invention which can reduce induction period of reaction and prevent the temperature raise in short time at the beginning of reaction.

The invention relates to a process for continuous production of hexafluoropropylene oxide. The materials are discharged when the reaction of hexafluoropropylene and oxygen is carried out fully, the hexafluoropropylene gas and the oxygen are mixed by proportion and then are introduced into the solvent in a reactor as a gas mixture, the oxygen and the hexafluoropropylene firstly pass through a solvent layer in the reactor and then are carried out the complete reaction in the solvent, the reactant is accumulated in a gas-phase space in the reactor continuously, the mixed gas containing the reactant in the gas phase can be controlled by pressure regulation, so as to discharge the materials to the outside of the reactor continuously, the discharging gas is condensed and reclaimed the containing solvent in the mixed gas by a condenser, the reactant gas after the condensation is sent to a processing system for further treatment and purification, finally the needed hexafluoropropylene oxide final product is obtained. The process flow is simple, the equipments are fewer, the operation is convenient and the equipment utilization ratio is high.

The present invention provides a process for oligomerization of hexafluoropropylene oxide, the process comprising polymerizing a mixture of hexafluoropropylene oxide and hexafluoropropene in the presence of an aprotic organic solvent using KF as a catalyst.

This invention discloses a preparation method for hexafluoropropylene oxide (HEP). The said method includes: a) providing solution for HFP in the reaction, and b) heating and charging oxygen, and preparing hexafluoropropylene oxide through molecular oxygen liquid-phase oxidation, wherein the referred reaction medium is selected from alpha-perfluoro-n-butyl-oxa-perfluorocyclopentane, alpha-perfluoro-n-propyl-oxa-perfluorocyclohexane or fluorocarbon cyclic ether mixture. The conversion rate of products can be improved and the reaction time can be shortened by this method.

The invention relates to a synthesis method of a diaryl hexafluoropropane compound, which comprises the following steps that: aromatics with one or more electron repulsive groups are mixed with anhydrous hydrogen fluoride in a reactor, and then hexafluoropropylene oxide is added into the reactor to be mixed and heated; after the reaction, the hydrogen fluoride is removed, the remained product is refined to obtain the diaryl hexafluoropropane compound; with the method, the isomerization of hexafluoropropylene oxide and the concentration reaction of aromatics are integrated into one process stage to be realized, so the process procedure of the synthesis is reduced, and the production cost and side product can be reduced.

An Ag-series solid catalyst for preparing hexafluoroepoxy propane from hexapropene and molecular oxygen by gas-phase method in tubular reactor contains Ag (10-50 mass%), alkali (or alkali-earth) metal compound (1-20), and carrier (49-89). It has high output rate and selectivity of product.

The invention relates to the technical field of organic synthesis, in particular to a method of preparing pentafluoroethyl isopropyl ketone. The method includes the steps that hexafluoropropylene oxide and hexafluoropropylene are used as raw materials and react at the temperature of 65-80 DEG C in the presence of a crown ether phase transfer catalyst and fluorine-containing salt to obtain pentafluoroethyl isopropyl ketone. The yield of the product prepared through the method is 88-91%, and the conversion rate of the raw material hexafluoropropylene is up to 100%. The method has the advantages of being easy to operate, low in requirement for equipment, low in cost, high in automation degree and high in equipment use ratio and can meet the requirement for industrial production application.

The invneiton discloses a synthetic method of perfluoropolyether. The synthetic method comprises the following steps of: reacting a first volume part of purified hexafluoropropylene gas and alkali metal fluoride in an aprotic solvent at 0 DEG C to 50 DEG C to obtain low polymer; cooling the temperature of the obtained low polymer to the range of -40 DEG C to -20 DEG C, and adding a second volume part of purified hexafluoropropylene gas for reaction with the low polymer to obtain perfluoropolyether. According to the synthetic method of perfluoropolyether disclosed by the invention, the synthetic process for feeding materials and controlling temperature in stages is adopted to prepare perfluoropolyether, so that the conversion rate of hexafluoropropylene reaches 99% and above; moreover, the prepared perfluoropolyether has high average molecular weight. Besides, the material hexafluoropropylene gas is purified by using alkali substances and silica gel, so that the used alkali substance and silica gel are low in cost and can be repeatedly used while the material gas reaches the using requirements. Meanwhile, in the process of synthesizing perfluoropolyether, the use of diluents is avoided, so that the process is simple and the cost is lower, therefore, the synthetic method is suitable for industrial application.

The invention discloses a method for preparing hexafluoropropylene oxide oligomer. Alkali-metal fluoride salt, aprotic inertia polarity organic solvents, fluorine-containing organic solvents and perfluoro(2-methyl-3-oxahexanoyl)fluoride are used for preparing a homogeneous activation initiator, the homogeneous activation initiator is used for initiating a hexafluoropropylene oxide monomer to have a polymerization reaction, and then the hexafluoropropylene oxide oligomer with a high molecular weight is obtained. Meanwhile, a part of products and related solvents are recycled, and an environment-friendly recycle production effect is achieved.

Disclosed is a novel method for producing hexafluoropropylene oxide, wherein a high HFPO selectivity can be achieved without using a phase-transfer catalyst. Specifically, hexafluoropropylene (HFP), a water-soluble and aprotic organic solvent, and an aqueous oxidant solution are brought into contact with each other in a very small space, so that hexafluoropropylene and the oxidant are reacted with each other, thereby obtaining hexafluoropropylene oxide (HFPO).

The invention discloses a preparation method for hexafluoropropylene oxide homopolymers. Potassium fluoride is employed as a catalyst to trigger ring-opening polymerisation of hexafluoropropylene oxide, a saturated solution of tetraethylene glycol dimethyl ether and fluorine containing solvent of cesium fluoride is added in batches for multiple times, the reaction temperature is lowered gradually from 0 DEG to -40 DEG C, thus reaction activity of tail end groups of hexafluoropropylene oxide homopolymers is kept, hexafluoropropylene oxide monomers are added continuously on this basis, and through control of addition times of hexafluoropropylene oxide and the cesium fluoride solution, hexafluoropropylene oxide homopolymers with an average polymerization degree of 50 can be synthesized. Through control of addition of monomers, hexafluoropropylene oxide homopolymers with an average polymerization degree of 20-50 can be synthesized selectively, and different industrial production requirements are met.

The invention discloses a method for preparing pentafluoride ethyl perfluoro isopropyl ketone through gas phases. The method is characterized in that under the existence of addition catalysts, hexafluoropropylene and hexafluoropropylene oxide or pentafluoropropionyl fluoride take gas phase addition reaction to obtain the pentafluoride ethyl perfluoro isopropyl ketone, or tetrafluoroethylene and heptafluorobutyl fluoride take gas phase addition reaction to obtain the pentafluoride ethyl perfluoro isopropyl ketone. The method has the advantages that the reaction route is short; in addition, rawmaterials such as the hexafluoropropylene, the tetrafluoroethylene, the hexafluoropropylene oxide and carbonyl fluoride can be easily obtained; the cost is low; the yield of the pentafluoride ethyl perfluoro isopropyl ketone is high; the continuous large-scale industrial production can be realized through the route.

The invention discloses a synthetic method of perfluoropropanoyl fluoride and a preparation method of a catalyst applied to a reaction. The synthetic method is innovatively characterized by comprising the steps that hexafluoropropylene oxide serves as the raw material and is subjected to a isomerization reaction at the proper reaction temperature and under the action of the catalyst, so that perfluoropropionyl chloride is generated. The preparation method of the catalyst is innovatively characterized by comprising the steps of weighing and compounding alkali metal fluoride into a solution with a certain concentration, adding activated carbon, placing mixed liquor into a muffle furnace, and conducting evaporation and sufficient drying till constant weight is reached. According to the preparation method, perfluor epoxypropane serves as the raw material to synthesize the perfluoropropionyl chloride, the hexafluoropropylene oxide is subjected to the isomerization reaction at the specific temperature and under the action of the alkali metal fluoride catalyst with the activated carbon as the carrier, so that the perfluoropropanoyl fluoride is generated, the raw material conversion rate and the product purity are high, the purity of an obtained product can reach 99% and above without being subjected to fractionation, and when the product is made to have a chemical reaction with alcohol, ester with the purity being 98.8% can be obtained.

The present invention relates to an industrial production process of hexa-fluorine epoxypropane. Hexa-fluorine propylene and oxygen perform liquid-phase oxidation in a reaction solvent, an auxiliary agent is added into the reaction solvent, the volume of the auxiliary agent is 0.3 to 5 percent of the volume of the reaction solvent, the reaction solvent is selected from perfluorocycloalkane; and the auxiliary agent is selected from one of or an arbitrary combination of the following substances: a halogenating alkyl phenylate with a molecular formula C6H5OCnH2nX and alkyl naphthalene with a molecular formula C10+pH8+2p. Because the perfluorocycloalkane and the solvent composed of halogenating alkyl phenylate/ alkyl naphthalene are used as media for the reaction for producing the hexa-fluorine epoxypropane, the present invention has the advantages of economy, environmental protection, high conversion, good selectivity, and the like.

The invention discloses a method for synthesis of pentafluoropropionyl fluoride by using hexafluoropropylene oxide as a raw materisl. Under the effect of a catalyst, hexafluoropropylene oxide is subjected to isomerization reaction to synthesize pentafluoropropionyl fluoride. The catalyst comprises a main catalyst and a co-catalyst, wherein the main catalyst is organic amine compounds, five-or six-membered nitrogen-containing heterocycles or six-membered fused ring aromatic compounds; the co-catalyst is an alkali metal fluoride; and the quality ratio of the main catalyst to the co-catalyst is 100:1 to 5:1. The method provided by the invention has the advantages of mild preparation process, simple operations and high yield of synthesized pentafluoropropionyl fluoride. The prepared pentafluoropropionyl fluoride is suitable for preparing fluorine alkyl group-containing vinyl ethers and perfluoro-propionyl peroxides.

The invention relates to the field of fluorine-containing fine chemistry, in particular to a method for preparing a hexafluoropropylene oxide trimer. Hexafluoropropylene oxide is used as a raw material, hexafluoropropylene oxide dimer alkoxide and fluorinated alkali metal salt are used as composite catalytic initiators, a chain transfer polymerization inhibitor is added, and the hexafluoropropylene oxide trimer is prepared after a reaction. The conversion rate of hexafluoropropylene oxide and the selectivity of the hexafluoropropylene oxide trimer are high in the method, and the operation method is simple, feasible, easy to control industrially and suitable for mass industrial production.

The invention relates to a method for preparing high-purity hexafluoropropylene oxide by extraction and rectification. The method comprises the following steps: selecting epoxy chloropropane as an extracting agent, wherein the mass ratio of the extracting agent to HFPO-HFP mixture feed is controlled between (1-200): 1; introducing the HFPO-HFP mixture into an extraction rectifying tower, spraying the epoxy chloropropane from the tower top, and separating HFPO from the tower top to obtain HFPO with purity over 99 percent; and discharging HFP and the epoxy chloropropane from the bottom of the extraction rectifying tower to be pressed into a reclaiming tower once again, separating the HFP from the top of the reclaiming tower, and discharging the epoxy chloropropane from the bottom of the reclaiming tower to be pumped once again to return a spraying port on the top of the extraction rectifying tower for cycle use. The method selects the epoxy chloropropane as the extracting agent to make relative volatility of the HFPO and the HFP reach 1.5 to 3.7, so that the HFPO and the HFP can be well separated; meanwhile, the number of column plates required for rectification can be reduced, and investment cost can be reduced.