Process for the recovery of fluorinated alkandic acids from wastewater

US6518442B1 · kind B1 · utility

Assignees

• Dyneon GmbH & Co., KG · DE
• Axiva GmbH · DE

Inventors

• Bernd Felix · Altötting, DE
• Tilman C. Zipplies · Burghausen, DE
• Stephan Führer · Burgkirchen an der Alz, DE
• Thomas Kaiser · Kelkheim, DE
• Armin Budesheim · Niedernhausen, DE

Key dates

• Filing date: Nov 16, 2000
• Grant date: Feb 11, 2003
• Expiry date: Nov 16, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C02F2101/14
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

The invention relates to a method for removing fluorinated emulsifying agent acids from waste waters, characterized in that the finely dispersed solids in the waste water are stabilized with a nonionic or cationic surfactant or an analogous acting surface active substance, the fluorinated emulsifying agent acids are subsequently bonded on an anion exchange resin and the fluorinated emulsifying agent acids are eluted from the latter.