Co-production of hydrocarbons and dimethyl ether
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United States of America Patent
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Issued Date -
Sep 17, 2009
app pub date -
Feb 3, 2005
filing date -
Feb 5, 2004
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Abandoned
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Abstract
A process for co-producing hydrocarbons and dimethyl ether (DME) includes feeding a gaseous feedstock comprising hydrogen and carbon monoxide, into a threephase low temperature catalytic Fischer-Tropsch reaction stage, allowing the hydrogen and carbon monoxide partially to react catalytically in the Fischer-Tropsch reaction stage to form hydrocarbons, and obtaining a tail gas from the Fischer-Tropsch reaction stage which includes unreacted hydrogen and carbon monoxide and also carbon dioxide. The composition of at least a portion of the tail gas is adjusted to provide a DME synthesis feedstock with a syngas number (SN) between 1.8 and 2.2, where formula (I) and where [H.sub.2], [CO] and [CO.sub.2] respectively are the molar proportions of hydrogen, carbon monoxide and carbon dioxide in the DME synthesis feedstock. The DME synthesis feedstock is fed into a DME synthesis stage for conversion. SN = [ H 2 ] - [ CO 2 ] [ CO ] + [ CO 2 ] ( I ) ##EQU00001##
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