FremgangsmÕte for Õ oppnÕ etylen, propylen og eventuelle butenisomerer fra metanol og/eller dimetyleter

摘要

Production of lower olefins with 2-3C atoms comprises reacting a methanol and/or dimethylether vapour and a reaction mixture containing water vapour in a first reactor (8) on a first form selective catalyst at 280-570 degrees C and 0.1-1 bar; withdrawing a product mixture containing 2-4C olefin and 5C<+> hydrocarbon from the first reactor; and cooling. The cooled first product mixture is fed through a separator (24) and a second product mixture containing ethylene and propylene is withdrawn. A 5C<+> stream is obtained, which is vaporised and mixed with water vapour. A ratio of H2O:hydrocarbons of 0.5-3:1 is used. The mixture containing water vapour is fed at 380-700 degrees C to a second reactor (32) containing a second form selective catalyst. A third product mixture is withdrawn from the second reactor which contains 50% olefinic components. This product mixture is cooled and fed to a separator.