Patent ID: 6399844
Filing Date: 2002-06-04
Classification: C07C,Y02P

Abstract:
A process for converting a methoxy compound to olefin products, comprising:adding a first quantity of methoxy compound and a non-reactive diluent to a portion of an olefin product gas composition formed by methoxy compound contact with a fixed bed of MTO catalyst in a first reaction vessel to form a feed to contact with said MTO catalyst in said first fixed bed such that the partial pressure of methoxy compound as initially contacted with said MTO catalyst of said first fixed bed is between 0.02 and 0.2 ata and the partial pressure of methoxy compound in the olefin product gas composition exiting from said first fixed MTO catalyst bed is at least 90% of the initial value of partial pressure of methoxy compound in the total feed, and routing a bleed portion of said olefin product gas composition formed in said first fixed bed reactor to an inlet of a second fixed bed reactor; adding a second quantity of methoxy compound into a mixture with said bleed portion of an olefin product gas composition from said first reaction vessel and with a portion of olefin product gas composition formed by methoxy compound contact with a fixed bed of MTO catalyst in a second reaction vessel to form a feed to contact with said MTO catalyst in said second fixed bed such that the partial pressure of methoxy compound as initially contacted with said MTO catalyst of said second fixed bed is between 0.02 and 0.2 ata and the partial pressure of methoxy compound in the olefin product gas composition exiting from said second fixed MTO catalyst bed is at least 80% of the initial inlet value of partial pressure of methoxy compound, and routing a bleed portion of said olefin product gas composition formed in said second fixed bed reactor to another location.