Patent · US Expired

Process for removing cyanogen halides and phosgene from waste gases

US4900523A · kind A · utility

3Cited by

11References

7Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Richard Bicker · Liederbach, DE
Manfred Schrod · Weiterstadt, DE
Hans-Christian Militzer · Odenthal, DE

Key dates

Filing date	Feb 17, 1989
Grant date	Feb 13, 1990
Priority date	—
Expiry date	Feb 17, 2009

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D53/70
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Cyanogen halides and/or phosgene are removed from waste gases by bringing the waste gases into intimate contact with an aqueous solution of at least one amine of the formula NR.sub.3 ; in the formula, 1 or 2 of the radicals R represent an alkanol or alkylamine group having 2 or 3 carbon atoms in each case, where H and/or C.sub.1 -C.sub.2 -alkyl is bound to the nitrogen of the amine group, and the remaining groups R are H or C.sub.1 -C.sub.4 -alkyl.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.