The invention relates to the use of an absorption liquid for purifying gases from gaseous acidic contaminants, the absorption liquid comprising A) 0.1 to 100% by weight of one or more amines of the formula I ##STR00001## where R.sub.1 is H, C.sub.1-C.sub.6-alkyl, an aromatic radical having 6 to 18 carbon atoms or a radical of the formula 2 ##STR00002## R.sub.2 is H, C.sub.1-C.sub.6-alkyl, an aromatic radical having 6 to 18 carbon atoms or a radical of the formula 3 ##STR00003## R.sub.3 is C.sub.1-C.sub.6-alkyl or an aromatic radical having 6 to 18 carbon atoms R.sub.4 is H or CH.sub.3 R.sub.5 is H or CH.sub.3 x is a number from 0 to 3 y is a number from 0 to 3 z is an integer between 1 and 30, and also, if appropriate, B) 0 to 99.9% by weight of water, and/or C) 0 to 99.9% by weight of any desired solvent.

 
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