Process for the recovery of perfluoroethercarboxylic acids

US5196579A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Thomas Gries · Solon, US
• Klaus-Dieter Ginzel · Hofheim, DE
• Frank Ebmeyer · Hattersheim, DE

Key dates

• Filing date: Dec 13, 1991
• Grant date: Mar 23, 1993
• Expiry date: Dec 13, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/487
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the recovery of perfluoroethercarboxylic acids from the crude product of the electrochemical conversion of these acids or of one of their soluble salts to perfluorinated ethers, in which the perfluoroethercarboxylic acids and their esters contained in the crude product are separated off with the aid of a solid basic alkali metal salt or its solution and converted, by reaction of the resulting salts with a strong acid, to the corresponding perfluoroethercarboxylic acids.