PERFLUORCARBOXYLIC ACID FLUORIDE PROCESS

摘要

FIELD: chemistry. ^ SUBSTANCE: perfluorcarboxylic acids and their derivatives are characterised by very high heat resistance and chemical stability, and are used in perfluorolefin polymerisation to produce perfluorochemical surface-active substances. Process for perfluorcarboxylic acid fluorides including perfluorheptanoic and perfluornonanoic acid fluorides, consists in electrochemical fluoridation of fluorine-containing alkanols of general formula H(CF2-CF2)nCH2OH, where n=3-4 in anhydrous hydrogen fluoride medium. Said alkanols are fractionated with each unit fraction fluoridated with tertiary aliphatic or aromatic amine added as an electrolytic additive in amount 5-10 wt % of electrolyte weight. ^ EFFECT: high yield perfluorheptanoic and perfluornonanoic acid fluorides without any changes in process parametres on the basis of fluorine-containing alkanols that are industrial products of methanol and tetrafluorethylene telomerisation. ^ 3 cl, 1 tbl, 6 ex