A low-pressure multifunctional filter separates CO2 and other air pollutants from flue, coal, natural and other gas mixtures. The separation agent is a solid carbon-rich sorbent, such as coke, charcoal, coal or activated carbon, that captures CO2 and other air pollutants at lower temperatures and li
A low-pressure multifunctional filter separates CO2 and other air pollutants from flue, coal, natural and other gas mixtures. The separation agent is a solid carbon-rich sorbent, such as coke, charcoal, coal or activated carbon, that captures CO2 and other air pollutants at lower temperatures and liberates them at higher temperatures. The sorbent is regenerated by heating with direct steam, hot CO2 or other source of thermal energy. The recovered CO2-rich product can be used for enhanced oil recovery, enhanced methane recovery, and subsequent storage in depleted oil and gas reservoirs.
대표청구항▼
1. A method for capturing carbon dioxide (CO2) from a CO2-containing flue gas mixture, comprising the steps of; (a) contacting the CO2-containing flue gas mixture with a single-stage-sorption, fixed-bed having a carbon-rich sorbent and which retains between 50% and 95% of CO2 from the flue gas mixtu
1. A method for capturing carbon dioxide (CO2) from a CO2-containing flue gas mixture, comprising the steps of; (a) contacting the CO2-containing flue gas mixture with a single-stage-sorption, fixed-bed having a carbon-rich sorbent and which retains between 50% and 95% of CO2 from the flue gas mixture at temperatures near or below ambient temperature: and (b) liberating a CO2 -enriched effluent by heating the fixed bed to temperatures of about 100° C. to a few hundred ° C. or, alternatively, by reducing the pressure in the fixed bed. 2. A method as defined in claim 1, wherein the contacting step is carried out at or near ambient pressure. 3. A method as defined in claim 1, wherein the contacting step is carried out at elevated pressures. 4. A method as defined in claim 1 where the CO2-containing flue gas mixture is selected from the group consisting of coal combustion gas mixture and other fossil-fuel combustion gas mixture. 5. A method as defined in claim 1 where the CO2-containing flue gas mixture also comprises nitrogen oxides, sulfur oxides, mercury, mercury compounds, and arsenic compounds that are retained on the carbon-rich sorbent following the contacting step. 6. A method as defined in claim 1 where the sorbent particles are selected from the group consisting of coal coke, petroleum coke, charcoal, activated carbon, virgin coal, and chemically or physically modified versions of these materials. 7. A method as defined in claim 1, further comprising the step of storing the CO2 -enriched effluent in a oil-depleted reservoir. 8. A method as defined in claim 1, further comprising the step of storing the CO2 -enriched effluent in a methane-depleted reservoir. 9. A method as defined in claim 1, further comprising the step of releasing the sorbed CO2 from the sorbent by vacuum combined with steam or other displacement agent. 10. A method as defined in claim 9, wherein the source of heat for heating the sorbent is provided, directly or indirectly, by steam or by hot CO2 or by electromagnetic energy. 11. A method for capturing carbon dioxide (CO2) from a CO2-containing flue gas mixture, comprising the steps of: (a) contacting the CO2-containing flue gas mixture with a single-stage-sorption, fixed-bed having a carbon-rich sorbent and which retains between 50% and 95% of CO2 from the flue gas mixture at temperatures near or below ambient temperature;(b) liberating a CO2-enriched effluent by heating the fixed bed to temperatures of about 100° C. to a few hundred ° C.;(c) capturing the liberated CO2-enriched effluent;(d) cooling the fixed-bed to approximately ambient temperature; and(e) repeating steps (a)-(d). 12. A method as defined in claim 11, wherein said heating step comprises passing steam over the fixed bed. 13. A method as defined in claim 11, wherein said heating step comprises passing CO2 heated to temperatures of about 100° C. to a few hundred ° C. over the single-stage, fixed bed.
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이 특허에 인용된 특허 (5)
Takatsuka Toru (Kanagawa JPX) Kajiyama Ryuichiro (Kanagawa JPX) Okada Yoshimi (Kanagawa JPX) Hirohama Seiya (Kanagawa JPX) Shibagaki Tetsuo (Toyama JPX) Kushida Toshio (Toyama JPX), Gas separation process and unit therefor.
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