Process for the preparation of hydrogencontaining gases

Details Process for the preparation of hydrogencontaining gases Process for the preparation of hydrogencontaining gases

C - Chemistry, Metallurgy

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B

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C01B 3/12 (2006.01) B01J 23/80 (2006.01) B01J 23/86 (2006.01) C01B 3/16 (2006.01)

Patent

CA 1186511

ABSTRACT A PROCESS FOR THE PREPARATION OF HYDROGEN- CONTAINING GASES. In a process for preparing hydrogen-containing gases, including ammonia synthesis gas, from hydrocarbons by desulfurization, primary and secondary reforming, shift conversion in two steps, removal of CO2 and methanation, the first step of the shift conversion is carried out with a catalyst consisting of copper oxide, zinc oxide and chromium oxide at a steam to dry gas ratio below 0.5, preferably 0.3-0.5, at 10-50 atm. abs. and 190-400°C, preferably 200-360°C; and second step of the shift conversion with a catalyst of copper oxide, zinc oxide and aluminium oxide at an inlet temperature of 160-195°C, preferably 175-195°C, at the same time being at least the highest of the temperatures (T1+ 10)°C and (T2 + 10)°C where T1 is the dew point and T2 the equilibrium temperature for the reaction Image . One avoids the carbide formation occurring when using the conventional iron catalysts in the first step of the shift conversion; and avoids the difficulties encountered with conventional copper-containing low-temperature shift catalysts in the first shift step. At the low temperature in second shift step one obtains a low reaction rate for methanol-formation (which involves a loss of energy), and avoids with the particular catalyst the large amounts of catalyst that is needed in the second shift step of known shift conversions when conventional shift catalysts are used.

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