Two or more acidic gaseous species such as hydrogen sulphide and carbon dioxide from an adsorbent can be selectively removed from a feed gas by contacting the feed gas with an adsorbent for these acidic species, followed by: a. subjecting the adsorbent to a first purging gas, said first purging gas
Two or more acidic gaseous species such as hydrogen sulphide and carbon dioxide from an adsorbent can be selectively removed from a feed gas by contacting the feed gas with an adsorbent for these acidic species, followed by: a. subjecting the adsorbent to a first purging gas, said first purging gas not containing said first acidic gaseous species and containing said second acidic gaseous species at a partial pressure which is at least the partial pressure of said second gaseous species in said feed gas; b. subsequently subjecting the adsorbent to a second purging gas, said second purging gas not containing said first gaseous species and, containing this second gaseous species at a partial pressure which is lower than the partial pressure of said second gaseous species in said feed gas.
대표청구항▼
1. A process for selectively removing a first and second acidic gaseous species from an adsorbent which has been contacted with a feed gas comprising at least the first and second gaseous species, the process comprising: (a) subjecting the adsorbent to a first purging gas, the first purging gas not
1. A process for selectively removing a first and second acidic gaseous species from an adsorbent which has been contacted with a feed gas comprising at least the first and second gaseous species, the process comprising: (a) subjecting the adsorbent to a first purging gas, the first purging gas not comprising the first acidic gaseous species and comprising the second acidic gaseous species at a partial pressure which is at least the partial pressure of the second gaseous species in the feed gas;(b) subsequently subjecting the adsorbent to a second purging gas, the second purging gas not comprising the first gaseous species and, if comprising the second gaseous species, comprising the second gaseous species at a partial pressure which is lower than the partial pressure of the second gaseous species in the feed gas. 2. The process according to claim 1, wherein the first acidic gaseous species comprises hydrogen sulphide and the second acidic gaseous species comprises carbon dioxide. 3. The process according to claim 1, wherein the first purging gas comprises carbon dioxide. 4. The process according to claim 1, wherein the second purging gas comprises a member selected from steam, nitrogen, methane and noble gases, and preferably comprises steam. 5. The process according to claim 1, further comprising, prior to step (a), the step of rinsing the adsorbent with a rinsing gas, the rinsing gas not comprising the first acidic gaseous species and comprising the second acidic gaseous species at a partial pressure which is lower than the partial pressure of the second gaseous species in the feed gas. 6. The process according to claim 5, wherein the rinsing gas comprises steam and/or nitrogen. 7. The process according to claim 1, wherein the adsorbent comprises alumina and one or more alkali metal oxides, hydroxides or carbonates. 8. The process according to claim 7, wherein the adsorbent further comprises one or more divalent metal oxides, hydroxides or carbonates. 9. The process according to claim 7, wherein the adsorbent is based on a hydrotalcite. 10. The process according to claim 8, wherein the adsorbent comprises magnesia and has a molar ratio of Mg to (Al+Mg) of between 0.05 and 0.95. 11. The process according to claim 10, wherein the molar ratio of Mg to (Al+Mg) is between 0.1 and 0.8. 12. The process according to claim 1, wherein step (a) is performed at a pressure which is less than ⅔ of the pressure of the step wherein the feed gas has been contacted with the adsorbent, and/or wherein step (b) is performed at a pressure which is less than ½ of the pressure of the step wherein the feed gas has been contacted with the adsorbent. 13. The process according to claim 1, wherein step (a) is performed in countercurrent with respect to the contacting of the adsorbent with the feed gas. 14. The process according to claim 13, wherein in step (a) only an upstream part of the adsorbent is subjected to the first purging gas. 15. A process for producing a desired gas, comprising: (a) reacting a feed gas to produce the desired gas and two or more gaseous acidic species, wherein the feed gas is reacted in the presence of an adsorbent capable of adsorbing two or more of the acidic gaseous species, and, subsequently,(b) removing the two or more acidic gaseous species from the adsorbent by the process according to claim 1. 16. The process according to claim 15, wherein the desired gas comprises hydrogen at a concentration higher than the hydrogen concentration of the feed gas. 17. The process according to claim 16, wherein the desired gas is produced by a sorption-enhanced water gas shift (SEWGS) process. 18. The process according to claim 17, wherein the reaction in the presence of an adsorbent is performed at a pressure in the range of 7-40 bar. 19. A process for producing a desired gas which is essentially free of H2S, comprising the steps of: (a) contacting a feed gas comprising H2S and CO and/or CO2 with an adsorbent capable of adsorbing CO2 and H2S;(b) subjecting the adsorbent to a first purging gas, the first purging gas not comprising H2S and comprising CO and/or CO2 at a partial pressure which is at least the partial pressure of CO and/or CO2 in the feed gas; and(c) subsequently subjecting the adsorbent to a second purging gas, the second purging gas not comprising H2S, and not comprising CO and/or CO2. 20. The process according to claim 19, wherein the desired gas comprises CO and/or CO2.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (2)
Sircar Shivaji ; Golden Catherine Marie Anne, PSA process for removal of bulk carbon dioxide from a wet high-temperature gas.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.