An energy-efficient method of recovering carbon dioxide (CO2) in a liquid state from a high-pressure gas stream is provided. The method includes cooling, condensing, and/or separating CO2 from a high-pressure gas stream and further purifying the resulting liquid CO2 in a purification zone to thereby
An energy-efficient method of recovering carbon dioxide (CO2) in a liquid state from a high-pressure gas stream is provided. The method includes cooling, condensing, and/or separating CO2 from a high-pressure gas stream and further purifying the resulting liquid CO2 in a purification zone to thereby provide a purified CO2 product. The purified liquid CO2 product may then be pumped to a higher pressure for further utilization and/or sequestration for industrial or environmental purposes.
대표청구항▼
1. A method of recovering carbon dioxide (CO2) in a liquid state from a high-pressure gas stream, said method comprising: (a) introducing a high-pressure feed gas stream comprising CO2 into an enrichment zone;(b) increasing the concentration of CO2 in said high-pressure feed gas stream introduced in
1. A method of recovering carbon dioxide (CO2) in a liquid state from a high-pressure gas stream, said method comprising: (a) introducing a high-pressure feed gas stream comprising CO2 into an enrichment zone;(b) increasing the concentration of CO2 in said high-pressure feed gas stream introduced into said enrichment zone to thereby provide a CO2-enriched feed gas stream, wherein said increasing includes at least one of the following steps (i) and (ii)— (i) passing said high-pressure feed gas stream through at least one membrane separation unit to thereby provide a H2-enriched permeate stream and a CO2-enriched retentate stream, wherein said CO2-enriched feed gas stream comprises at least a portion of said CO2-enriched retentate stream, and(ii) passing said high pressure feed gas stream through at least one compressor to thereby provide a compressed gas stream, wherein said CO2-enriched feed gas stream comprises at least a portion of said compressed gas stream;(c) cooling and at least partially condensing at least a portion of said CO2-enriched feed gas stream via indirect heat exchange with at least one refrigerant stream to thereby provide a cooled mixed-phase CO2-enriched feed stream;(d) separating at least a portion of said cooled mixed-phase CO2-enriched feed stream in a first separation zone to thereby provide a condensed CO2-rich liquid fraction and an uncondensed CO2-lean vapor fraction;(e) further separating at least a portion of one or more non-CO2 components from said condensed CO2-rich liquid fraction in a purification zone to thereby provide a purified CO2-rich liquid stream; and(f) recovering a liquid CO2 product stream from said purification zone, wherein said liquid CO2 product stream comprises at least a portion of said purified CO2-rich liquid stream. 2. The method of claim 1, wherein said increasing of step (b) includes both of steps (i) and (ii). 3. The method of claim 1, wherein the pressure of said CO2-enriched feed gas stream is at least 350 psia. 4. The method of claim 1, wherein said high-pressure feed gas stream further comprises at least one component selected from the group consisting of hydrogen, methane, nitrogen, CO, oxygen, and combinations thereof. 5. The method of claim 1, wherein the pressure of said liquid CO2 product stream recovered from said purification zone is at least 750 psia and wherein said liquid CO2 product stream comprises at least 80 mole percent of CO2, based on the total moles of said liquid CO2 product stream. 6. The method of claim 1, wherein the pressure of condensed CO2-rich liquid fraction is at least 650 psia and wherein said condensed CO2-rich liquid fraction comprises at least 50 percent of the total amount of CO2 present in said CO2-enriched feed gas stream cooled in step (c). 7. The method of claim 1, wherein said liquid CO2 product stream comprises at least 70 percent of the total amount of CO2 present in said CO2-enriched feed gas stream. 8. A method of recovering carbon dioxide (CO2) in a liquid state from a high-pressure gas stream, said method comprising: (a) passing a high-pressure feed gas stream comprising CO2 and at least one non-CO2 component through a first enrichment zone to thereby provide a CO2-enriched feed gas stream having a higher CO2 concentration than said high-pressure feed gas stream;(b) cooling and partially condensing at least a portion of said CO2-enriched feed gas stream to thereby provide a condensed CO2-rich liquid fraction and an uncondensed CO2-lean vapor fraction;(c) purifying at least a portion said condensed CO2-rich liquid fraction by distillation in a purification zone to thereby provide a purified CO2-rich liquid stream; and(d) recovering a liquid CO2 product stream from said purification zone, wherein said liquid CO2 product stream comprises at least a portion of said purified CO2-rich liquid stream. 9. The method of claim 8, wherein at least one of said CO2-enriched feed gas stream, said condensed CO2-rich liquid fraction, and said purified CO2-rich liquid stream has a pressure of at least 750 psia. 10. The method of claim 8, wherein at least a portion of said cooling of step (b) is accomplished using at least a portion of said liquid CO2 product stream. 11. The method of claim 8, wherein said first enrichment zone comprises at least one membrane separation unit and/or at least one compressor. 12. The method of claim 8, wherein said condensed CO2-rich liquid fraction comprises at least 50 percent of the total amount of CO2 present in said CO2-enriched feed gas stream. 13. The method of claim 8, wherein said recovering of step (d) includes pumping at least a portion of said purified CO2-rich liquid stream to a pressure at or above its critical pressure. 14. The method of claim 8, wherein said liquid CO2 product stream comprises at least 70 percent of the total amount of CO2 present in said CO2-enriched feed gas stream. 15. A method of recovering carbon dioxide (CO2) in a liquid state from a high-pressure gas stream, said method comprising: (a) cooling and at least partially condensing a high-pressure feed gas stream comprising CO2 via indirect heat exchange with at least one refrigerant to thereby provide a cooled CO2-containing stream;(b) separating at least a portion of said cooled CO2-containing gas stream in a first separation zone to thereby provide a condensed CO2-rich liquid fraction and an uncondensed CO2-lean vapor fraction;(c) removing at least a portion of one or more non-CO2 components from said condensed CO2-rich liquid fraction in a purification zone to thereby provide a purified CO2-rich liquid stream; and(d) recovering at least a portion of said purified CO2-rich liquid stream from said purification zone as a liquid CO2-rich product stream. 16. The method of claim 15, further comprising prior to said cooling of step (a) passing at least a portion of a gas stream comprising CO2 through a first enrichment zone to thereby provide a CO2-enriched feed gas stream, wherein said CO2-enriched feed gas stream has a pressure of at least 350 psia, wherein said high-pressure feed gas stream subjected to said cooling of step (a) comprises at least a portion of said CO2-enriched feed gas stream. 17. The method of claim 15, wherein at least a portion of said cooling of step (a) is accomplished using at least a portion of said liquid CO2 product stream. 18. The method of claim 15, wherein said recovering of step (d) includes pumping at least a portion of said purified CO2-rich liquid stream from said purification zone at a pressure of at least 750 psia. 19. The method of claim 15, wherein said high-pressure feed gas stream further comprises at least one non-CO2 component selected from the group consisting of hydrogen, methane, nitrogen, CO, oxygen, and combinations thereof. 20. The method of claim 15, wherein said condensed CO2-rich liquid fraction comprises at least 50 percent of the total amount of CO2 present in said high-pressure feed gas stream prior to said cooling of step (a) and/or wherein said liquid CO2 product stream comprises at least 70 percent of the total amount of CO2 present in said high-pressure feed gas stream prior to said cooling of step (a).
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