Patent ID: 7015369
Filing Date: 2006-03-21
Classification: C07C

Abstract:
1. A process of producing propylene from methanol, wherein methanol vapor is reacted on a first catalyst to obtain a first vapor mixture containing dimethyl ether (DME), and from the first vapor mixture a product mixture containing propylene is produced on a form-selective zeolite catalyst, wherein the form-selective zeolite catalyst is disposed as bed in at least two series-connected shaft reactors, a first partial stream of the DME-containing first vapor mixture together with steam is introduced into the first shaft reactor, from the first shaft reactor a first intermediate product mixture is withdrawn and charged into the second shaft reactor, a second partial stream of the DME-containing first vapor mixture also being supplied to the second shaft reactor, a steam-containing product mixture is withdrawn from the last of the series-connected reactors and cooled, a fraction rich in propane is separated therefrom and residual substances are obtained, which are in part gaseous and contain C 3+ hydrocarbons, and at least part of the residual substances are recirculated to at least one of the shaft reactors.