| 摘要 |
1,186,939. Ammonia production. WHESSOE Ltd. 4. Sept., 1968 [8 Sept., 1967; 11 Oct., 1967; 15 Feb., 1968; 20 March, 1968], Nos. 41233/67, 46463/67, 7553/68 and 13527/68. Heading C1A. Ammonia is produced by catalytic conversion of an N2/H2 synthesis gas mixture, the hydrogen being- produced by the reforming and/or partial oxidation of one or more hydrocarbons with subsequent removal, of unrequired substances, wherein.the conversion is effected at the same, or higher, pressure as the synthesis gas is produced, the conversion being at 600-1000 p.s.i.g. in a converter, the inlet temperature of which is kept low enough to ensure that. the exothermic reaction does not cause a temperature rise emough to damage the catalyst, and the removal of NH3 being-at-leastpartly by absorption. or adsorption.. By operation, at low pressures, the low yield (e.g. 1%), is compensated by simplicity of operation and apparatus. The synthesis gas is preferably recycled after NH3-recovery. The recovery may be by absorption in a liquid, e.g. water, H2SO4, HNO3, or by adsorptionon active carbon or on a molecular sieve; or by refrigeration. The NH3 may be recovered from water by pressure distillation. |
