Patent ID: 7304197
Filing Date: 2007-12-04
Classification: C07C,Y02P

Abstract:
1. A process for converting oxygenate to olefins which comprises: contacting a feedstock comprising oxygenate with a catalyst comprising a molecular sieve under conditions effective to produce a vaporous product comprising said olefins, water and unreacted oxygenate; condensing in a condenser said vaporous product to provide a liquid stream rich in said water and unreacted oxygenate, and an olefins-rich vapor stream; introducing at least part of said liquid stream to a feed tray in a fractionation tower which provides an oxygenate-rich overhead product and a water-rich liquid bottoms product; providing a liquid, oxygenate-rich stream comprising at least about 20 wt % oxygenate above said feed tray, wherein said oxygenate is selected from the group consisting of methanol, ethanol, and a combination thereof; and passing said olefins-rich vapor stream through a recovery train to recover at least some of said olefins.