Patent ID: 6592836
Filing Date: 2003-07-15
Classification: C01B

Abstract:
A process for producing high purity carbon monoxide product gas which comprises the steps of:(a) providing a CO-SER unit; (b) feeding a feed gas of a substantially equimolar mix of CO2 and H2 with a slight excess of CO2 to the CO-SER unit to produce a CO-SER product gas comprising CO, a small amount of CO2, and substantially no H2 at high pressure; (c) providing a TSA unit having a plurality of adsorber vessels, each adsorber vessel having an adsorbent therein capable of selectively adsorbing CO2, said adsorber vessel being at high pressure and low temperature; (d) feeding the CO-SER product gas to one of said plurality of adsorber vessels in the TSA unit to selectively remove CO2 gas to produce a TSA product gas that is of high CO purity and of high pressure, said feeding continuing to said one adsorber vessel until a point prior to CO2 breakthrough occurring, wherein said adsorbent therein is substantially spent and then going on to sequentially feed others of said plurality of adsorber vessels; and (e) regenerating any adsorber vessels having adsorbent that is substantially spent and simultaneously providing H2 for said feed gas of substantially equimolar mix of CO2 and H2 in a regeneration process comprising: (i) heating said spent adsorbent obtained in the step of feeding the CO-SER product gas to one of said plurality of adsorber vessels in the TSA unit by passing H2 at high temperature and high pressure to produce a TSA regeneration effluent gas of H2, CO2 and low levels of CO that is of sufficient purity to be used as H2 in the feed gas in a CO-SER process, said TSA effluent gas provided at high pressure; and (ii) combining said TSA effluent gas with a feed of CO2 to obtain the feed gas of substantially equimolar mix of CO2 and H2 with a slight excess of CO2.