Process for removing cyanogen halides and phosgene from waste gases
AssigneeHoechst Aktiengesellschaft
InventorsRichard Bicker, Manfred Schrod, Hans Militzer
Life of this patent
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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.
Claims7
A process for removing cyanogen halides and/or phosgene from waste gases containing said cyanogen halides and/or phosgene, by washing with aqueous solutions of bases, wherein the waste gas is brought into intimate contact with a wash liquid which contains as active components 2 to 20% by weight of dimethylaminoethanol or diethylaminoethanol or a combination of both and an alkali metal hydroxide in a concentration of up to about 25% by weight.
Dependencies are inferred from the claim text.