PROCESS OF TREATING A PRESSURIZED LADEN ABSORBENT SOLUTION

摘要

A gas which contains CO2 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 CO2 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 a stripping zone and is stripped in said stripping zone with a gas which predominantly consists of CO2. A gas mixture which contains a valuable gas is withdrawn from said stripping zone. The absorbent solution is pressure-relieved further in a succeeding pressure relief zone, from which a flashed-off gas consisting predominantly of CO2 is withdrawn.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.