Patent ID: 7619127

Claim:
A process of converting oxygenate to olefin product in a riser, comprising the steps of: a) contacting olefin forming catalyst flowing through a contacting conduit in a gaseous medium in an upstream region of the riser with individual jets of gaseous oxygenate introduced into the contacting conduit through a sidewall of the contacting conduit and at an angle between 30° and 75° inclined from the flow of the olefin forming catalyst to initiate conversion of the oxygenate to olefin product, decreasing the angle to increase the rate of conversion in the bottom zone of oxygenate to olefin and creating an interstitial space between the jets that is occupied by solid catalyst particles; b) mixing together the individual jets of oxygenate downstream of contact at a location within the contacting conduit; c) expanding the individual jets of oxygenate as the oxygenate and catalyst flow through the contacting conduit; and d) flowing the oxygenate and catalyst from the contacting conduit to a connecting conduit having a cross sectional area less than that of the contacting conduit to continue conversion of the oxygenate to olefin product.