Recovery of highly fluorinated carboxylic acids from the gas phase

US5990330A · kind A · utility

Assignee

• Dyneon GmbH · DE

Inventors

• Reinhard A. Sulzbach · Burghausen, DE
• Wilhelm Kowatsch · Garching bei München, DE
• Dieter Steidl

Key dates

• Filing date: Mar 7, 1996
• Grant date: Nov 23, 1999
• Expiry date: Mar 7, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/42
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Highly fluorinated carboxylic acids can be removed from exhaust gas streams by scrubbing with concentrated alkali solutions if these alkali solutions have a density high enough for the salt of the highly fluorinated carboxylic acid to separate out as an independent phase. An apparatus suitable therefor contains a scrubber and a separation vessel which is advantageously equipped with a conveying element, a collection vessel connected via an overflow and a circulation line for the scrubbing liquor.