Dividing wall fractionation in integrated oxygenate conversion and product cracking

摘要

Improved processing of an oxygenate-containing feedstock for increased production or yield of light olefins is provided. Such processing involves oxygenate conversion to olefins and subsequent cracking of heavier olefins wherein at least a portion of the C4+ hydrocarbon stream resulting from such oxygenate conversion processing and at least a portion of a cracked olefins effluent stream resulting from such olefin cracking processing are processed with a dividing wall fractionation column to form process streams containing: a) C3−hydrocarbons, b) C6+ hydrocarbons, and c) C4 and C5 hydrocarbons, including C4 and C5 olefins, respectively.