Process for the preparation of an olefinic product

摘要

Process for the preparation of an olefinic product, which process comprises reacting an oxygenate feedstock and an olefinic co-feed in a reactor in the presence of an oxygenate conversion catalyst comprising a molecular sieve having one-dimensional 10-membered ring channels, and a further molecular sieve 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; separating the olefinic reaction effluent into at least a first olefinic fraction and a second olefinic fraction; recycling at least part of the second olefinic fraction; and recovering at least part of the first olefinic fraction as olefinic product.