Process for producing perfluorocarboxylic acid fluoride

摘要

A process of producing a perfluorocarboxylic acid fluoride having the formula (1): <IMAGE> (1) wherein n is an integer of at least 2, comprising effecting oligomerization of hexafluoropropylene oxide in the presence of an alkali metal fluoride a sulfone or a mixture of a sulfone with an ether having the formula (2): CH3O(CH2CH2O)mCH3 (2) where m is an integer of 2 to 6. This process makes it possible to improve production yield of hexafluoropropylene oxide oligomers remarkably, and to raise a reaction temperature for the oligomerization, as compared with conventional methods, thereby shortening reaction time therefor.