METHOD AND ARRANGEMENT FOR PRODUCING C2-C4-OLEFINS FROM METHANOL AND/OR DIMETHYL-ETHER

摘要

The invention relates to producing C₂-C₄-olefins, in particular propylene, from an educt mixture containing water vapour and methanol and/or dimethyl ether, wherein the inventive method consists in transforming the educt mixture on a catalyst in a reactor into a reaction mixture containing low-molecular olefins and gasoline hydrocarbons, in separating said mixture in a first separation device into an olefin C₅-rich mixture, a C₅₊- gasoline hydrocarbon-rich mixture and into a gaseous phase. In order to increase a propylene yield, the C₅₊- gasoline hydrocarbon-rich mixture is directed to a second separation device, wherein aromatics contained in the mixture are separated, and residue flow which is substantially aromatic-free is redirected at least partially to the reactor.