| 摘要 |
In 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 DEG C, preferably 200-360 DEG 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 DEG C, preferably 175-195 DEG C, at the same time being at least the highest of the temperatures (T1 + 10) DEG C and (T2 + 10) DEG C where T1 is is the dew point and T2 the equilibrium temperature for the reaction ZnO + CO2 -><- ZnCO3. |
