Patent ID: 6864401
Filing Date: 2005-03-08
Classification: C07C,Y02P

Abstract:
1. A process for obtaining an ethylene and propylene enriched stream from an oxygenate to olefin reactor, the process comprising: a) providing an effluent stream from an oxygenate to olefins reactor comprising ethylene, propylene, dimethyl ether and one or more byproducts selected from the group consisting of propane, methyl acetylene, propadiene, acetaldyhde and butylene; b) quenching the effluent stream with a quench medium to provide an olefin stream; c) separating the olefin stream into a heavy fraction comprising C5+ olefins and a remaining fraction; and d) fractionating the remaining fraction in a distillation column to provide a first fraction comprising a majority of the ethylene and propylene and a second fraction comprising a majority of the dimethyl ether and a majority of a second compound selected from the group consisting of propadiene, methyl acetylene, and acetaldehyde, wherein a portion of the second fraction is heated by the quench medium.