Process for treating industrial gas stream.

摘要

This invention relates to a process for pretreating a synthesis gas stream comprising carbon dioxide and hydrogen and by product sulfur compounds in the form of hydrogen sulfide and carbonyl sulfide by first passing the gas stream through an initial scrubbing zone where substantially all of the hydrogen sulfide is removed by a physical solvent, but only a part of the carbonyl sulfide is removed. Substantially all of the carbonyl sulfide and carbon dioxide is removed in a second scrubbing zone leaving a gaseous product and a spent solvent containing carbon dioxide and carbonyl sulfide. The solvent from the second zone is desorbed and the resulting gas stream fractionated to produce a carbon dioxide stream substantially free of residual sulfur compounds alternatively a carbon dioxide stream containing sulfur compounds but free of residual hydrogen.