| 摘要 |
The reaction products from the synthesis of ammonia from nitrogen and hydrogen at 100 to 250 atmospheres are subjected to absorption in two stages, serially arranged, to separate ammonia by aqueous ammonia solutions containing 15 to 40 and 1 to 10% by weight of ammonia, respectively, the remaining water and ammonia in the gas being removed by condensation. The absorption may be carried out at the same pressure as the synthesis. The gaseous product from the absorption has an overall content of ammonia and water of 2000 to 10,000 p.p.m. (preferably less than 6000 p.p.m.) and may be purified further by condensation at - 20 DEG to - 30 DEG C., after which it contains 500 to 2000 p.p.m. of ammonia. The ammoniated solution produced may be distilled to produce substantially anhydrous ammonia and aqueous ammonia solutions containing 15 to 40% and 1-10% by wt. respectively which are recycled to the absorption system. |
