Method for recovering fluorinated alkanoic acids from waste waters

US6613941B1 · kind B1 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Bernd Felix · Altötting, DE
• Reinhard A. Sulzbach · Burghausen, DE
• Stephan Führer · Burgkirchen an der Alz, DE
• Thomas Kaiser · Kelkheim, DE
• Hagen Kniep · Frankfurt, DE
• Armin Budesheim · Niedernhausen, DE

Key dates

• Filing date: Nov 16, 2000
• Grant date: Sep 2, 2003
• Expiry date: Nov 16, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C02F2101/36
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Fluorinated emulsifier acids can be isolated from wastewater by firstly removing fine solids and/or material which can be converted into fine solids from the wastewater, preferably by precipitation, subsequently bringing the wastewater into contact with an anion-exchange resin and eluting the adsorbed emulsifier acids from the latter.