Patent ID: 8822749

Claim:
A process for the preparation of an olefinic product, which process comprises the steps of a) reacting an oxygenate feedstock and an olefinic co-feed in a reactor in the presence of an oxygenate conversion catalyst comprising a molecular sieve in the hydrogen form having one-dimensional 10-membered ring channels selected from the group consisting of ZSM-22 having a SAR in the range of 40-150, ZSM-23 having a SAR in the range of 20-120 and mixtures thereof, and a further molecular sieve in the hydrogen form having more-dimensional channels, wherein the weight ratio between the one-dimensional molecular sieve and the further molecular sieve is in the range of from 1:1 to 100:1, to prepare an olefinic reaction effluent comprising ethylene and propylene; b) separating the olefinic reaction effluent into at least a first olefinic fraction and a second olefinic fraction; c) recycling at least part of the second olefinic fraction obtained in step b) to step a) as olefinic co-feed; and d) recovering at least part of the first olefinic fraction obtained in step b) as an olefinic product comprising ethylene and/or propylene.