Production of perfluoro (alkyl vinyl) ethers
AssigneeE. I. Du Pont de Nemours and Company
InventorPaul Raphael Resnick
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Abstract
A good yield, high reaction rate process is disclosed for the production of perfluoro(alkyl vinyl ethers). The process involves elimination of halogen, preferably chlorine, from carbon atoms α and β to an ether oxygen in an α,β-dihaloperfluoro ether wherein the α,β-dihaloperfluoro ether is allowed to react with zero valent zinc in a pyrrolidinone solvent. More particularly, the inventive process relates to high yield production of CF2═CFOCF2CF2SO2F from CF2ClCFClOCF2CF2SO2F wherein CF2ClCFClOCF2CF2SO2F is allowed to react with zero valent zinc in the presence of N-methyl-2-pyrrolidinone.
Claims13
A process for producing perfluoro(alkyl vinyl ether) represented by the formula A—CF═CF—O—B, comprising the steps of:
- contacting at least one α,β-dihaloperfluoro ether represented by the formula A—CFX—CFX—O—B with zero valent zinc in the presence of a pyrrolidinone solvent to form a first mixture comprising perfluorovinyl ether, and
- recovering the perfluoro(alkyl vinyl ether) from the first mixture,
- wherein:
- X is selected from the group consisting of chlorine, bromine, or iodine,
- A is selected from the group consisting of fluorine and normal and branched chain perfluoroalkyl radicals, and B is selected from the group consisting of normal and branched chain perfluoroalkyl radicals, wherein A and B can contain oxygen and sulfur heteroatoms configured in functional groups selected from ether, ester, ketone, and sulfonyl fluoride, and wherein A and B can be bonded together forming a ring.
Dependencies are inferred from the claim text.