Preparation of fuel grade dimethyl ether

Abstract From the Canadian patent

A process for the preparation of fuel grade dimethyl ether from a hydrogen and carbon oxides containing synthesis gas wherein the synthesis gas is converted to a mixed process gas of dimethyl ether methanol and water in one or more , catalytic reactors in the presence of a catalyst having activity both in synthesis of methanol and methanol dehydration; the mixed process gas is cooled to obtain a liquid process phase containing the produced methanol dimethyl ether and water and a gaseous process phase containing unconverted synthesis gas and a part of produced dimethyl ether which process comprises , further steps of separating the gaseous phase and liquid phase; passing the liquid …