Removal of phosgene from off-gases

Details Removal of phosgene from off-gases Removal of phosgene from off-gases

1991-10-30

1993-04-06

Straub, Gary P.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Halogenous component

55 71, 423481, 423488, C01B 707, B01D 4700

Patent

active

052001636

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.

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patent: 4568741 (1986-02-01), Livingston
patent: 4595575 (1986-06-01), Oeste et al.
patent: 4900523 (1990-02-01), Bicker et al.

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