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High-pressure steam supply in hydrogen production process is made more efficient by water gas shift process which comprises, in alternating sequence: (a) a reaction stage wherein a feed gas comprising CO and H2O is fed into a water gas shift reactor containing a sorbent material capable of adsorbing

High-pressure steam supply in hydrogen production process is made more efficient by water gas shift process which comprises, in alternating sequence: (a) a reaction stage wherein a feed gas comprising CO and H2O is fed into a water gas shift reactor containing a sorbent material capable of adsorbing H2O and CO2 and wherein a product gas issuing from the reactor is collected, (b) a regeneration stage wherein CO2 is removed from the reactor, (c) a loading stage, wherein H2O is fed into the reactor; wherein said feed gas mixture has a molar ratio of H2O to CO below 1.2, and the loading stage is performed at a lower pressure than the pressure of the reaction stage.

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1. A water gas shift process comprising: (a) feeding a feed gas comprising CO and H2O into a water gas shift reactor containing a sorbent material capable of adsorbing H2O and CO2 and collecting a product gas issuing from the reactor,(b) removing CO2 from the reactor, and(c) feeding H2O into the rea

1. A water gas shift process comprising: (a) feeding a feed gas comprising CO and H2O into a water gas shift reactor containing a sorbent material capable of adsorbing H2O and CO2 and collecting a product gas issuing from the reactor,(b) removing CO2 from the reactor, and(c) feeding H2O into the reactor, wherein: step (c) coincides with or follows step (b); step (c) is performed at a pressure of less than ⅔ of the pressure of step (a), all the steps are performed in alternating sequence, and the feed gas mixture has a molar ratio of H2O to CO of below 1.2. 2. The process according to claim 1, wherein step (a) is performed at a pressure between 4 and 80 bar. 3. The process according to claim 2, wherein step (a) is performed at a pressure between 10 and 40 bar. 4. The process according to claim 1, wherein step (b) is performed at a pressure less than half of that of step (a). 5. The process according to claim 1, wherein step (b) is performed at a pressure between 0 and 4 bar. 6. The process according to claim 1, wherein step (b) and step (c) are performed simultaneously using a gas containing at least 50 vol. % of steam, after depressurisation. 7. The process according to claim 1, wherein the step (c) is performed following step (b), and step (c) is performed at a pressure which is higher than the pressure of step (b). 8. The process according to claim 7, wherein step (b) is performed using a gas containing less than 50 vol. % of steam. 9. The process according to claim 1, wherein step (a) is performed at an average reactor temperature of between 300 and 500° C. 10. The process according to claim 1, wherein the adsorbent comprises an alkali-promoted alumina. 11. The process according to claim 1, wherein the adsorbent comprises calcium oxide and/or magnesium oxide and/or zinc oxide. 12. The process according to claim 10, wherein the adsorbent has an atomic ratio of (Mg+Ca+Zn) to Al of between 0.25 and 1.5, and an atomic ratio of alkali metal to Al of between 0.1 and 1.0. 13. The process according to claim 10, wherein the adsorbent has an atomic ratio of (Mg+Ca+Zn) to Al of between 0.4 and 1.0, and an atomic ratio of alkali metal to Al of between 0.25 and 0.75. 14. The process according to claim 1, wherein the feed gas further comprises between 100 and 10,000 ppm of H2S. 15. The process according to claim 1, further comprising, between steps (a) and (b), feeding a purging gas comprising CO2 into the reactor. 16. The process according to claim 1, wherein the feed gas mixture has a molar ratio of H2O to CO of 0-0.75, and a CO concentration in the feed gas of at least 10%. 17. The process according to claim 1, wherein the feed gas issues from a preceding water gas shift reaction. 18. The process according to claim 1, wherein the product gas is used for combustion, and the feed gas mixture has a molar ratio of H2O to CO of 0.5-1.2. 19. The process according to claim 1, wherein the product gas is used for producing chemicals, and the feed gas mixture has a molar ratio of H2O to CO of below 0.8. 20. A water gas shift process comprising: (a) reacting a feed gas comprising CO and H2O in a water gas shift reactor containing a sorbent material capable of adsorbing H2O and CO2 and collecting a product gas issuing from the reactor, (b) removing CO2 from the reactor, and (c) loading H2O into the reactor, wherein the loading step follows the removing step; all of the steps are performed in alternating sequence, the loading step is performed at a pressure of less than ⅔ of that of the reaction step, and the feed gas mixture has a molar ratio of H2O to CO 0-2.0.