Patent ID: 7038102
Filing Date: 2006-05-02
Classification: C07C,C10G,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 deactivated catalyst having carbonaceous deposits and a product comprising said olefins; separating said deactivated catalyst from said product to provide a separated vaporous product which contains catalyst fines; quenching said separated vaporous product with a liquid medium containing water and catalyst fines, in an amount sufficient for forming a light product fraction comprising light olefins and catalyst fines and a heavy product fraction comprising water, heavier hydrocarbons and catalyst fines; treating said light product fraction by contacting with a liquid oxygenate substantially free of catalyst fines to provide a light product fraction having reduced catalyst fines content and a liquid fraction of increased fines content, said liquid oxygenate substantially free of catalyst fines being selected from the group consisting of methanol and ethanol; compressing said light product fraction having reduced catalyst fines content; and recovering said light olefins from said compressed light product fraction.