Patent ID: 7592496
Filing Date: 2009-09-22
Classification: C07C,C10G

Abstract:
1. A method for producing light olefins, said method comprising: contacting a synthesis gas-containing feedstock in a synthesis gas conversion reactor zone with a catalyst material and at reaction conditions effective to produce a synthesis gas conversion reactor zone effluent comprising product dimethyl ether, other synthesis gas conversion products and unreacted synthesis gas, the other synthesis gas conversion products comprising methanol and water; separating the unreacted unreacted synthesis gas and the product dimethyl ether from the other synthesis gas conversion products methanol and water to form a first process stream comprising the synthesis gas and product dimethyl ether; separating the other synthesis gas conversion product methanol from the other synthesis gas conversion product water; contacting the first process stream with at least a portion of the separated product methanol in a separation vessel to separate the product dimethyl ether from the unreacted synthesis gas by absorbing the product dimethyl ether into the separated product methanol; and contacting a feed comprising at least a portion of the separated product dimethyl ether in an oxygenate conversion reactor zone with an oxygenate conversion catalyst and at reaction conditions effective to convert the feed to an oxygenate conversion product stream comprising light olefins.