PROCESS FOR DISCHARGING A GAS MIXTURE CONTAINING H (ARROW ALARM) 2 (ARROW DOWN) S, COS AND CO (ARROW ALARM) 2 (ARROW DOWN), AND WASHING SOLUTION THEREOF

摘要

In a scrubbing zone, the gas mixture is brought into contact with a scrubbing solution, which is principally composed of at least one N-alkyl-substituted lactam and has a water content of 1 to 10% by weight. The temperatures in the scrubbing zone are in the range from 0 to 50 DEG C. Ammonia and/or methylamine are added to the scrubbing zone as catalyst in an amount of 5 to 100 gram-mol per m3 of scrubbing solution. By this means at least 50% of the COS fed to the scrubbing zone is reacted by hydrolysis. IMAGE