Use of aluminum phosphate as the dehydration catalyst in single step dimethyl ether process

Abstract From the Canadian patent

The present invention pertains to a process for the coproduction of methanol and dimethyl ether (DME) directly from a synthesis gas in a single step thereafter the, "single step DME process"). In this process the synthesis gas comprising hydrogen, and carbon oxides is contacted with a dual catalyst system comprising a physical mixture of a methanol synthesis catalyst and a methanol dehydration catalyst. The present invention is an improvement to this process for providing an active and stable catalyst system. The improvement comprises the use of an aluminum phosphate based catalyst as the methanol dehydration catalyst. Due to its moderate acidity such a, catalyst avoids the coke formation …