利用氢氧化镁热分解氯化铵制氨气工艺的研究

Research on preparation of NH_3 by using thermal decomposition of NH_4Cl and Mg(OH)_2

对利用氢氧化镁热分解氯化铵制氨气反应体系进行了热力学计算分析,以反应温度、反应物的物质的量比、反应时间为变量,以固体产物中的含氮量、氯收率以及氨气收率等为评价指标,对氢氧化镁热分解氯化铵制氨气的工艺条件进行了研究。实验结果表明,在反应温度为375℃,氢氧化镁与氯化铵的物质的量比为1∶0.75,反应时间为50 min时,氯收率和氨气收率均可达到90%以上,同时氢氧化镁分解氯化铵能够直接生成碱式氯化镁,不需向反应器中通入水蒸气。

Thermodynamic calculation and analysis were made for tile reaction system of preparing NH3 by using thermal decomposition of NH4Cl and Mg（OH） 2. Process conditions of the preparation of NH3 were investigated with reaction temperature, amount-of-substance ratio, and reaction time as the variables and with nitrogen content of solid product, chlorine yield,and NH3 yield as evaluation indexes. Results showed the chlorine yield and NH3 yield both could reach more than 90% and the decomposition of Mg（ OH ） 2 and NH4 Cl could directly produce NH3 without inletting water steam into the reactor when the reaction temperature was 375℃, reaction time was 50 rain, and amount -of-substance ratio of Mg （ OH ） e to NH4Cl was 1：0.75.