氯化铵转化新工艺的机理及条件探究

doi:10.11962/1006-4990.2020-0216

Abstract

Abstract:

Aiming at the problem of excess capacity of ammonium chloride in soda industry,a new way of conversion of ammonium chloride was put forward.Solid ammonium chloride and magnesium carbonate were used as raw materials to produce magnesium chloride,ammonia,carbon dioxide and water by solid-state heating reaction.Ammonia and carbon dioxide can be recycled using for soda production.The reaction mechanism of solid ammonium chloride and magnesium carbonate was investigated from the thermodynamics,and the effects of reaction temperature,reaction time and ratio of ingredients on the conversion of ammonium chloride were discussed.The orthogonal experiment was carried out to determine the optimal reaction conditions,the products were characterized by XRD,SEM and EDS.The results show that the optimum reaction conditions were as follows：the amount-of-substance ratio of magnesium carbonate and ammonium chloride was 1.8∶2.0,the temperature was 523 K and the reaction time was 120 min.Under the conditions,the conversion ratio of ammonium chloride can reach 94.40% and the purity of magnesium chloride can reach the industrial standard.

Key words: soda ash, ammonium chloride, magnesium chloride, reaction mechanism, thermodynamics

CLC Number:

TQ126.2

Li Fei,Zhou Jianmin,Li Chengyu,Xu Wentao,Zhang Xinyue,Li Xinwei,Wang Jun,Ji Zhiyong,Zhao Yingying,Guo Xiaofu,Yuan Junsheng. Study on mechanism and conditions of the new process of ammonium chloride conversion[J]. Inorganic Chemicals Industry, 2021, 53(3): 48-53.

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References 18

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物质	500 K时?′_T /（J·mol^-1·K^-1）	ΔH_f^$\ominus$₂₉₈/ （J·mol^-1）	物质	500 K时?′_T /（J·mol^-1·K^-1）	ΔH_f^$\ominus$₂₉₈/ （J·mol^-1）
MgCO₃	75.456	-1 111 689	CO₂	218.230	-393 505
NH₄Cl	106.548	-314 553	H₂O（g）	192.597	-241 814
MgCl₂	97.965	-641 407	HCl	190.073	-92 048
NH₃	196.920	-45 940

水平	因素
水平	A n（碳酸镁）:n（氯化铵）	B 反应温度/K	C 反应时间/min
1	1.4:2.0	473	90
2	1.6:2.0	498	120
3	1.8:2.0	523	150

因素		A	B	C	氯化铵转化率/%	氯化镁纯度/%
1		1	3	1	86.32	46.02
2		1	1	2	91.43	46.03
3		1	2	3	89.52	46.05
4		2	2	2	96.82	46.23
5		2	3	3	90.20	46.47
6		2	1	1	86.37	46.15
7		3	3	2	97.42	45.89
8		3	2	3	94.40	46.54
9		3	1	1	92.74	45.95
氯化铵转化率	k₁	89.09	90.18	88.48
	k₂	91.13	93.58	95.22
	k₃	94.85	91.31	91.37
	R	5.76	3.40	6.74

n（碳酸镁）: n（氯化铵）	反应温度/K	反应时间/min	氯化铵转化率/%	氯化镁纯度/%
1.6:2.0	498	120	94.28	46.58
1.8:2.0	523	120	94.40	46.29

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on mechanism and conditions of the new process of ammonium chloride conversion

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