Removal of phosgene from off-gases

US5200163A · kind A · utility

Assignee

• BASF SE

Inventors

• Jochem Henkelmann · Mannheim, DE
• Thomas-Michael Kahl · Münstermaifeld, DE
• Irene Troetsch-Schaller · Bissersheim, DE
• Leopold Hupfer · Friedelsheim, DE
• Wolfgang Franzischka · Bischofswerda, DE
• Wolfgang Schwarz · Ludwigshafen, DE

Key dates

• Filing date: Oct 30, 1991
• Grant date: Apr 6, 1993
• Expiry date: Oct 30, 2011

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D53/70
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

To remove phosgene from off-gases, the former is reacted in a washing zone with a liquid which contains or is composed of compounds of the formula ##STR1## where R.sub.1 and R.sub.2 are identical or different and are each aliphatic or cycloaliphatic alkyl of 1 to 8 carbons, or R.sub.1 and R.sub.2 are --(CH.sub.2).sub.n -- where n is 4 or 5, R.sub.3 is hydrogen or aliphatic or cycloaliphatic alkyl of 1 to 6 carbon atoms, or R.sub.1 or R.sub.2 and R.sub.3 are --(CH.sub.2).sub.m -- where m is 3, 4 or 5. The liquid can be regenerated by the addition of water, and the regenerated liquid can be returned to the washing zone.