Basf Aktiengesellschaft

Ernst Fuerst

Rolf Fikentscher

Klaus Volkamer

Ulrich Wagner

Herbert Helfert

Max Appl

Jozsef Gerendas

Klaus Kuessner

Rudolf Rokohl

Hans J Henrici

An aqueous solution containing from 0.81 to 1.3 moles of piperazine per liter is used as a washing agent for removing impurities such as H.sub.2 S, CO.sub.2 and COS from gases. Piperazine can also be used, in amounts of up to 0.8 mole per liter, together with physical or chemical solvents, to accelerate the absorption of H.sub.2 S, CO.sub.2 and COS. The washing process is used for natural gases, coke-oven gases, gases from the gasification of coal and synthesis gases, of any origin.

Removal of CO.sub.2 and/or H.sub.2 S and/or COS from gases containing

Special quaternary ammonium salts derived from triaminoalkyl derivatives of hexahydrotriazine for use as retarders in the dyeing of anionic polyacrylonitrile fibers with basic dyes.

Dyeing process using quaternary ammonium salt as retarder

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Neustadt, Germany

Ernst Fuerst