| 摘要 |
The production of ammonium nitrate (NH4NO3) from ammonia and nitric acid (HNO3) comprising the steps of: a) providing a reaction gas mixture comprising hydrogen 20 and nitrogen 18; b) passing the reaction gas mixture over a catalyst to form ammonia 34; c) catalytically oxidising a first portion of the ammonia to form a gas mixture comprising nitrogen, oxygen and nitric oxide (NO); and d) converting the NO into HNO3 40, thereby forming a vent gas mixture 14 comprising nitrogen, oxygen and nitrogen oxides (NOx), wherein the process comprises treating the vent gas mixture to produce a nitrogen gas stream and using at least a portion of the nitrogen gas stream 18 (e.g. having less than 10 ppm oxygen) in the reaction gas mixture, and reacting a second portion of the ammonia recovered 44 in step (b) with a portion of the nitric acid recovered in step (d) to form NH4NO3 46. The hydrogen may be generated by steam reforming of hydrocarbons 30 to produce syngas, followed by water-gas shift (WGS) stage, carbon dioxide removal and methanation stage. The vent gas treatment of NOx may comprise reducing it with ammonia from the ammonia production unit 22 to form nitrogen. |
