Patent ID: 8829259

Claim:
A light olefins synthesis process comprising: (a) passing an oxygenate feed to an oxygenate-to-olefin reactor to contact the oxygenate feed with a molecular sieve catalyst and to convert oxygenate feed to light olefins which are discharged from the oxygenate-to-olefin reactor in an effluent stream; (b) separating the effluent stream into a first light olefins stream separate from a first stream containing C4 and higher hydrocarbons; (c) selectively hydrogenating and then cracking the first stream containing C4 and higher hydrocarbons to form a first cracked gas effluent stream containing light olefins; (d) separately cracking a hydrocarbon stream to form a second cracked gas effluent stream containing light olefins, wherein the second cracked gas effluent stream containing light olefins comprises a stream containing C8 and lighter hydrocarbons produced as an overhead of a water quench; (e) combining the first cracked gas effluent stream and the second cracked gas effluent stream to generate a combined stream; (f) removing C6 and heavier hydrocarbons from the combined stream by compression to generate the combined cracked gas effluent stream; (g) fractionating the combined cracked gas effluent streams to produce a second light olefins-containing stream separate from a second stream containing C4 and higher hydrocarbons; (h) co-conditioning the first and second light olefins-containing streams to remove acid gases and produce a conditioned steam; and (i) separating the conditioned stream into an ethylene product stream, a propylene product stream and a stream containing C4 hydrocarbons.