Linde Aktiengesellschaft

Metallgesellschaft Aktiengesellschaft

Hans Kammerer

Gerhard Grunewald

A gas which contains CO.sub.2 and at least one of the valuable gases methane, hydrogen or carbon monoxide is purified by means of an absorbent solution in a scrubbing zone under a pressure of at least 5 bars. The laden absorbent solution has absorbed CO.sub.2 and at least one of the valuable gases by physical dissolution. For a recovery of the valuable gas or gases, the laden absorbent solution is pressure-relieved to an intermediate pressure in the stripping zone and is stripped in the stripping zone with a gas which predominantly consists of CO.sub.2. A gas mixture which contains a valuable gas is withdrawn from the stripping zone. The absorbent solution is pressure-relieved further in a succeeding pressure-relief zone, from which a flashed-off gas consisting predominantly of CO.sub.2 is withdrawn. The laden absorbent solution is pressure-relieved to a first intermediate pressure in a pressure-relief zone which precedes the stripping zone and the laden absorbent solution is then supplied to the stripping zone. The gas which has been flashed off in the succeeding pressure-relief zone may be fed to the stripping zone as a stripping gas.

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Frankfurt-am-Main, Germany

Hans Kammerer