Patent ID: 7317133
Filing Date: 2008-01-08
Classification: C07C,Y02P

Abstract:
1. A process for the production of light weight olefins comprising: a) producing an olefin-rich feedstock by contacting an oxygenate-containing feedstock with a catalyst comprising a non-zeolitic molecular sieve; b) passing the olefin-rich feedstock comprising C c) passing the heavy weight olefin stream to a second stage separation zone to provide a second light weight olefin stream, a medium weight olefin stream comprising C d) passing the medium weight olefin stream to an olefin cracking reactor operated at an inlet temperature of about 450° to 600° C. to convert at least a portion of the medium weight olefin stream into a cracked olefin stream comprising C e) returning at least a portion of the cracked olefin stream to the second stage separation zone, withdrawing a drag stream comprising the remaining portion of the cracked olefin stream; and f) returning at least a portion of the second light weight olefin stream to the first separation zone.