The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 1993
Filed:
Oct. 30, 1991
Jochem Henkelmann, Ludwigshafen, DE;
Thomas M Kahl, Roemerberg, DE;
Irene Troetsch-Schaller, Frankenthal, DE;
Leopold Hupfer, Friedelsheim, DE;
Wolfgang Franzischka, Frankenthal, DE;
Wolfgang Schwarz, Otterstadt, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
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.