Patent 7919660 was granted and assigned to Honeywell UOP on April, 2011 by the United States Patent and Trademark Office.
A method of converting methanol feedstock to olefins is provided and includes contacting the methanol feedstock in a first conversion zone with a catalyst at reaction conditions effective to produce a first reaction zone effluent comprising DME, unreacted methanol and water, and recycling at least a portion of an overhead vapor product to the first conversion zone and/or to the second conversion zone.