Patent ID: 8603399

Claim:
A system for converting oxygenates to light olefins, said system comprising: a reactor for contacting an oxygenate-containing feedstream with catalyst and converting the oxygenate-containing feedstream to an oxygenate conversion product stream comprising fuel gas hydrocarbons, light olefins, and C 4+ hydrocarbons; a first compressor to compress at least a portion of the oxygenate conversion product stream to form a compressed oxygenate conversion product stream; a gas concentration system to treat the compressed oxygenate conversion product stream to recover light olefins and to form a C 4+ hydrocarbon stream; a reactor for contacting at least a portion of the C 4+ hydrocarbon stream with catalyst and converting C 4 and C 5 olefins therein contained to a cracked olefin effluent stream comprising light olefins; and a first return line wherein at least a portion of the cracked olefin effluent stream is introduced into the first compressor and subsequently processed through the gas concentration system.