| 摘要 |
1,274,504. Ammonia synthesis. PETROCARBON DEVELOPMENTS Ltd. 18 Sept., 1970 [30 Sept., 1969], No. 48080/69. Heading C1A. In the synthesis of NH 3 from- N 2 and H 2 derived from He-containing- natural gas; the impurity content of the gas feed to which unreacted gases are recycled is maintained constant by (a) withdrawing a purge gas stream from the gases being recycled (b)-treating the purge stream by low temperature partial condensation to remove AR and CH 4 before or after which a bleed stream is removed from the purge stream, and (c) returning the remainder of the purge stream to the reactants; the effluent stream from the condensation process and the bleed stream each being removed at a rate such that the AR, CH 4 and He content of the gas feed remains constant. When the bleed stream is removed after the condensation process it may be treated to recover the helium. |
