Membrane/distillation method and system for extracting CO2 from hydrocarbon gas
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United States of America Patent
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Oct 24, 2006
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app pub date -
Oct 30, 2003
filing date -
Oct 30, 2003
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Abstract
A method of separating CO.sub.2 from a hydrocarbon gas inlet stream that is within predetermined pressure and temperature ranges, including the steps of subjecting the inlet stream to fractional distillation providing a CO.sub.2 bottom product stream and a distillation overhead stream, passing the distillation overhead stream to the inlet of a primary reflux drum producing a primary reflux liquid stream and a hydrocarbon vapor stream, subjecting the hydrocarbon vapor stream to membrane separation to provide a hydrocarbon product stream and a permeate stream, compressing the permeate stream and recycling the compressed permeate stream to the inlet of the primary reflux drum thereby providing a CO.sub.2 liquid product and a hydrocarbon gas product.
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