Process of improved sulfur capture from a syngas mixture

A process for recovering sulfur and carbon dioxide from a syngas stream, the process comprising the steps of:

• supplying a syngas stream to a nonselective absorption unit, the syngas stream comprising syngas, carbon dioxide, and hydrogen sulfide;
• separating the syngas stream in the nonselective absorption unit using an absorption process to produce an overhead syngas stream and an acid gas stream;
• introducing the acid gas stream to a selective absorption unit;
• processing the acid gas stream in the selective absorption unit to obtain an overhead carbon dioxide stream and a recovered hydrogen sulfide stream;
• introducing the recovered hydrogen sulfide stream to a membrane separation unit, the recovered hydrogen sulfide stream comprising hydrogen sulfide and carbon dioxide;
• separating the recovered hydrogen sulfide stream in the membrane separation stage to produce a retentate stream and a permeate stream, wherein the retentate stream comprises hydrogen sulfide, wherein the permeate stream comprises carbon dioxide;
• and
• introducing the retentate stream to a sulfur recovery unit.