三元体系NH4Cl+MgCl2+H2O 323.2 K相平衡研究

doi:10.19964/j.issn.1006-4990.2021-0384

Abstract

Abstract:

The stable phase equilibria of the ternary system NH₄Cl+MgCl₂+H₂O was determined by isothermal dissolution equilibrium method at 323.2 K.The density,equilibrium composition solid and liquid phase were determined and the phase diagram of the ternary system was plotted.The results showed that double salt NH₄Cl·MgCl₂·6H₂O was formed at 323.2 K,and its phase diagram consisted of two invariant points（F₁,F₂）,three univariate curves（AF₁,F₁F₂,F₂B） and three crystallization zones（NH₄Cl,MgCl₂·6H₂O,NH₄Cl·MgCl₂·6H₂O）.By comparing the phase diagrams at 273.2,298.2,323.2 K,it could be found that with the increase of temperature,the crystallization zones of NH₄Cl and MgCl₂·6H₂O becomed smaller,the crystallization zone of NH₄Cl·MgCl₂·6H₂O becomed larger.Meanwhile,the type of double salt NH₄Cl·MgCl₂·6H₂O changed from the incommensurate to the commensurate type,therewith,the corresponding incommensurate invariant point changed to the commensurate type.

Key words: phase equilibria, ternary system, solubility, ammonium carnallite

CLC Number:

TQ124.4

CHEN Shuai,YANG Bo,CHEN Niancu,LUO Jun,REN Siying,ZENG Ying,YU Xudong. Study on phase equilibria of ternary system NH₄Cl+MgCl₂+H₂O at 323.2 K[J]. Inorganic Chemicals Industry, 2022, 54(4): 100-103.

Figures/Tables 5

Table 1

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References 15

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序号	密度ρ/ （g·cm^-3）	液相组成		固相组成		平衡固相
序号	密度ρ/ （g·cm^-3）	w （NH₄Cl）/ %	w （MgCl₂）/ %	w （NH₄Cl）/ %	w （MgCl₂）/ %	平衡固相
1,A	1.161 7	33.43	0.00	—	—	NH₄Cl
2	1.153 7	32.30	1.66	82.00	0.62	NH₄Cl
3	1.187 7	29.57	3.77	61.19	2.20	NH₄Cl
4	1.201 1	26.52	6.56	64.14	3.43	NH₄Cl
5	1.197 9	25.05	8.24	73.17	3.28	NH₄Cl
6	1.217 1	21.81	11.25	74.09	4.25	NH₄Cl
7	1.231 8	18.35	14.71	68.49	6.18	NH₄Cl
8	1.237 3	15.78	16.96	69.09	6.92	NH₄Cl
9,F₁	1.298 9	12.69	21.18	33.26	21.75	NH₄Cl+N-Car
10	1.305 9	11.05	21.72	19.68	34.87	N-Car
11	1.287 6	8.69	23.79	16.90	36.15	N-Car
12	1.307 5	6.40	24.99	17.72	34.78	N-Car
13	1.311 5	5.13	26.21	15.95	36.41	N-Car
14	1.338 5	3.17	27.86	15.90	35.38	N-Car
15	1.351 3	1.38	30.65	12.52	35.09	N-Car
16	1.370 9	0.70	32.47	11.44	36.11	N-Car
17,F₂	1.411 2	0.09	35.36	8.13	37.60	N-Car+ MgCl·6H₂O
18	1.421 0	0.04	36.54	—	—	MgCl·6H₂O
19,B	1.441 4	0.00	37.64	—	—	MgCl·6H₂O

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on phase equilibria of ternary system NH₄Cl+MgCl₂+H₂O at 323.2 K

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Study on phase equilibria of ternary system NH4Cl+MgCl2+H2O at 323.2 K