| 摘要 |
Catalytic, exothermic gas reactions, particularly the synthesis of ammonia from nitrogen and hydrogen, are carried out by pre-heating the reactant gas by heat exchange with hot product, passing the reactant gas through one or more tubes extending through the catalyst bed in the same direction as the gas flowing through the catalyst itself, and after mixing this reactant gas with further, cold reactant gas, it is passed again through one or more tubes extending through the catalyst bed in the opposite direction to the gas flowing through the catalyst itself, and finally reacting on flowing through and contacting the catalyst itself, which is maintained by this method at the desired temperature, e.g. 450-550 DEG C., particularly for the synthesis of ammonia. |
