Preparation method of pentafluoropropionyl fluoride

Abstract

The invention provides a preparation method of pentafluoropropionyl fluoride, which comprises the following steps: by using cesium fluoride as a catalyst and amine as a solvent, reacting hexafluropropylene oxide low polymer at 110-130 DEG C under the reaction pressure of 2-3 atm for 2-4 hours to generate the pentafluoropropionyl fluoride; and adding the raw material into the reactor, and introducing the gas generated by the reactor into a cold trap to perform liquid collection, wherein the other end of the cold trap is communicated with the reactor, the gas is used for circulating cooling, and the liquid is the required product. The hexafluropropylene oxide low polymer used as the initial reactant is subjected to decomposition reaction at proper temperature under the action of the catalyst; and the method has the advantages of mild reaction conditions and high purity, is simple to operate and can easily implement large-scale production. The yield of the pure pentafluoropropionyl fluoride obtained by the cracking reaction catalyzed by the cesium fluoride is up to 92% above, and the purity is higher than 98%.

Description

technical field [0001] The invention relates to a method for synthesizing pentafluoropropionyl fluoride, in particular to a method for synthesizing pentafluoropropionyl fluoride with hexafluoropropylene oxide oligomers as raw materials. Background technique [0002] Pentafluoropropionyl fluoride, molecular formula: CF 3 CF 2 COF; Molecular weight: 166.02; Boiling point: -28°C; It is a colorless gas at room temperature, acidic, easy to undergo esterification reaction with alcohol, and generates HF gas and perfluoropropionic acid when it meets water. [0003] As the raw material and intermediate of special fluorine-containing functional materials, pentafluoropropionyl fluoride is a very important compound. For example, a series of fluorine-containing alkyl vinyl ethers can be prepared. This compound is a modified monomer for fluorine-containing elastomers. It can effectively destroy the crystallinity of the copolymer, and the C-O bond in the molecule endows the molecule with...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to provide a preparation method of pentafluoropropionyl fluoride, so as to solve the problems in the prior art that the preparation method of pentafluoropropionyl fluoride is complex and difficult in industrial production

Images