Patent ID: 7074971
Filing Date: 2006-07-11
Classification: C07C

Abstract:
1. A process for separating components from an olefin-containing effluent stream, the process comprising the steps of: (a) providing the effluent stream, wherein the effluent stream contains ethane, ethylene, propylene, and dimethyl ether; (b) separating the effluent stream in a first separation unit into a first fraction and a second fraction, wherein the first fraction contains a majority of the ethane, ethylene and propylene present in the effluent stream, and wherein the second fraction contains a majority of the dimethyl ether present in the effluent stream; (c) separating at least a portion of the first fraction into a third fraction and a fourth fraction, wherein the third fraction contains a majority of the ethylene and ethane present in the at least a portion of the first fraction, and wherein the fourth fraction contains a majority of the propylene present in the at least a portion of the first fraction, wherein the effluent stream, the first fraction, and the third fraction further contain methane and acetylene; (d) separating at least a portion of the third fraction into a fifth fraction and a sixth fraction, wherein the fifth fraction contains a majority of the methane present in the at least a portion of the third fraction; and the sixth fraction contains a majority of the acetylene, ethylene and ethane present in the at least a portion of the third fraction; and (e) contacting the acetylene in at least a portion of the sixth fraction, or in a portion separated from the sixth fraction, with hydrogen and carbon monoxide under conditions effective to convert at least a portion of the acetylene to ethylene.