Patent ID: 7402720
Filing Date: 2008-07-22
Classification: C07C

Abstract:
1. A process for producing a stream of propylene and a stream of butylene from an olefin stream, the process comprising the steps of: (a) providing a reactor effluent from an oxygenates-to-olefins process as an olefin stream comprising propylene, MAPD, dimethyl ether, and butylene; (b) fractionating the olefin stream thereby producing a first overhead stream and a first bottoms stream, such that the first overhead stream comprises propylene, comprises from about 5 ppbw to about 1000 ppbw dimethyl ether based on the weight of the first overhead stream, and is substantially free of MAPD, and such that the first bottoms stream comprises MAPD and butylene, wherein no propane is added to said reactor effluent before this olefin stream is fractionated in this step (b); and (c) fractionating the first bottoms stream thereby producing a second overhead stream and a second bottoms stream, such that the second overhead stream comprises MAPD and such that the second bottoms stream comprises about 10 wt. % or more butylene, wherein the second bottoms stream is substantially free of MAPD.