METHOD AND SYSTEM FOR PRODUCING OLEFINS FROM DIMETHYL ETHER

摘要

For the production of olefins from dimethyl ether gaseous dimethyl ether in a purity of 70-100 wt-% together with recycle gas, which contains olefinic, paraffinic and/or aromatic hydrocarbons, as well as steam is charged to a first catalyst stage of a re actor.;To render the temperature profile over the catalyst stages as flat as possible, but close to the optimum operating temperature, gaseous dimethyl ether in a purity of 70-100 wt-% together with recycle gas, which contains olefinic, paraffinic and aromatic hydrocarbons, is charged to at least one downstream catalyst stage, wherein this downstream catalyst stage additionally is fed with product gas from the upstream catalyst stage.

主权项

1. A process for producing olefins from dimethyl ether, wherein gaseous dimethyl ether in a purity of 70-100 wt-%, together with recycle gas which contains olefinic, paraffinic and/or aromatic hydrocarbons, as well as steam is charged to a first catalyst stage of a reactor and wherein gaseous dimethyl ether in a purity of 70-100 wt-%, together with recycle gas which contains olefinic, paraffinic and aromatic hydrocarbons is charged to at least one downstream catalyst stage, wherein this downstream catalyst stage additionally is fed with product gas from the upstream catalyst stage.