Patent ID: 8003841
Filing Date: 2011-08-23
Classification: C07C,Y02P,Y10S

Abstract:
1. A process for utilizing products from DME synthesis in converting oxygenates to olefins, the process comprising the steps of: removing a DME reactor effluent from a DME reactor, wherein the DME effluent includes DME, water, and methanol; separating carbon dioxide gas from the DME reactor effluent in a liquid gas separator to produce a degassed effluent stream; providing the degassed effluent stream to a DME column to produce a DME feedstock and a solvent stream, wherein the solvent stream includes methanol and water; feeding the DME feedstock to an oxygenate to olefin reactor to produce an olefin containing effluent, wherein the olefin containing effluent further includes oxygenates; separating the olefin containing effluent to produce a light olefin containing fraction and a heavy olefin containing fraction, wherein the light olefin containing fraction includes ethylene and the heavy olefin containing fraction includes C contacting the light olefin containing fraction with a first portion of the solvent stream in a first solvent contacting zone to produce a first olefin containing raffinate stream and a first oxygenate containing extract; and contacting the heavy olefin containing fraction with a second portion of the solvent stream in a second solvent contacting zone to produce a second olefin containing raffinate stream and a second oxygenate containing extract; and routing the second oxygenate containing extract to the oxygenate to olefin reactor.