Purification of fluorinated carboxylic acids

US5312935A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Ludwig Mayer · San Jose, US
• Gernot Lohr · Altötting, DE

Key dates

• Filing date: Apr 21, 1993
• Grant date: May 17, 1994
• Expiry date: Apr 21, 2013

Classification

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

Abstract

Fluorinated carboxylic acids which do not have the required purity for use as emulsifier in the polymerization of fluorinated monomers can, if necessary after prior de-watering, be treated with oxidants, whereupon the isolation of the pure product is carried out by crystallisation or, preferably, by distillation.