A process is described for increasing the hydrogen content of a synthesis gas mixture comprising hydrogen, carbon oxides and steam, comprising the steps of: (i) passing the synthesis gas mixture at an inlet temperature in the range 300-450° C. over a N first water-gas shift catalyst disposed in a fi
A process is described for increasing the hydrogen content of a synthesis gas mixture comprising hydrogen, carbon oxides and steam, comprising the steps of: (i) passing the synthesis gas mixture at an inlet temperature in the range 300-450° C. over a N first water-gas shift catalyst disposed in a first shift vessel to form a first shifted gas mixture, and (ii) passing the first shifted gas mixture at an inlet temperature in the range 170-300° C. over a second water gas shift catalyst disposed in a second shift vessel to form a second shifted gas mixture, wherein the second water-gas shift catalyst comprises copper and the first shift vessel contains a sorbent material for capturing halogen contaminants disposed downstream of the first water gas shift catalyst.
대표청구항▼
1. A process for increasing the hydrogen content of a synthesis gas mixture comprising hydrogen, carbon oxides and steam, comprising the steps of: (i) passing the synthesis gas mixture at an inlet temperature in the range of 300-450° C. over a first water-gas shift catalyst disposed in a first shift
1. A process for increasing the hydrogen content of a synthesis gas mixture comprising hydrogen, carbon oxides and steam, comprising the steps of: (i) passing the synthesis gas mixture at an inlet temperature in the range of 300-450° C. over a first water-gas shift catalyst disposed in a first shift vessel to form a first shifted gas mixture, and(ii) passing the first shifted gas mixture at an inlet temperature in the range of 170-300° C. over a second water gas shift catalyst disposed in a second shift vessel to form a second shifted gas mixture,wherein the second water-gas shift catalyst comprises copper and the first shift vessel contains a sorbent material for capturing halogen contaminants disposed downstream of the first water gas shift catalyst. 2. The process according to claim 1, wherein the first water-gas shift catalyst is a high temperature shift catalyst. 3. The process according to claim 2, wherein the high-temperature shift catalyst comprises an iron-containing catalyst. 4. The process according to claim 1, wherein the second water-gas shift catalyst is a copper-containing, low-temperature shift catalyst. 5. The process according to claim 1, wherein the water gas shift process is performed adiabatically in the first and second shift vessels. 6. The process according to claim 1, wherein the sorbent material comprises a solid material which is more basic than zinc oxide. 7. The process according to claim 6, wherein the solid material more basic than zinc oxide comprises a basic compound of any element of Group IA or Group IIA of the Periodic Table, other than beryllium. 8. The process according to claim 6, wherein the sorbent material comprises a solid material which is more basic than zinc oxide supported on a carrier material. 9. The process according to claim 1, wherein the sorbent material comprises at least one of sodium oxide, sodium carbonate, potassium oxide or potassium carbonate supported on a carrier material that is alumina, silica, titania, zirconia, ceria, magnesia or zinc oxide, or a mixture thereof, or a refractory cement. 10. The process according to claim 9, wherein the alkali concentration in the sorbent material is in the range of 0.1 to 10.0% by weight calculated as sodium oxide or potassium oxide. 11. The process according to claim 1, wherein the sorbent material is present in two or more different forms to enhance the flow of the first shifted gas through the sorbent material. 12. The process according to claim 11, wherein the sorbent material is provided in two or more zones. 13. The process according to claim 12, wherein the zones are provided as layers within the first shift vessel. 14. The process according to claim 11, wherein the sorbent material is provided as fixed bed of particles comprising one or more horizontal layers above one or more annular layers disposed around a gas collector situated adjacent an outlet from the vessel. 15. The process according to claim 14, wherein the one or more annular layers comprise either an inert ceramic bed support material, a sorbent material, or an inert ceramic bed support material and a sorbent material. 16. The process according to claim 9, wherein the alkali concentration in the sorbent material is in the range of 0.5 to 5% by weight calculated as sodium oxide or potassium oxide. 17. The process according to claim 11, wherein the sorbent material is provided in 2, 3 or 4 zones.
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