Phosgene removal process

Details Phosgene removal process Phosgene removal process

1984-01-27

1985-01-15

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Halogenous component

423424, 423499, B01D 5334

Patent

active

044938187

ABSTRACT:
Phosgene is removed from an off gas containing phosgene by contacting the off gas with an aqueous solution containing alkali metal hydroxide and a tertiary amine compound having 3 to 20 carbon atoms. The concentration of the alkali metal hydroxide can vary from 1 to 25 weight percent and the concentration of the tertiary amine can be any amount which is effective in the contact apparatus chosen. The amines found to be useful are trialkyl amines having 1 to 4 carbon atoms and pyridines having 0 to 3 alkyl groups of 1 to 5 carbon atoms and diamines such as 4-dimethylaminepyridine.

REFERENCES:
patent: 2430861 (1947-11-01), Carpenter et al.
patent: 3314753 (1967-04-01), Richert et al.
patent: 3376113 (1968-04-01), Frevel et al.
patent: 3411867 (1968-11-01), Beech et al.
patent: 3789580 (1974-02-01), Allemang et al.
patent: 4064218 (1977-12-01), Scholz et al.
patent: 4301126 (1981-11-01), Duembgen et al.

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