Phase equilibria determination and solubility calculation of the quaternary system CaCl2-SrCl2-BaCl2-H2O at 338.15 K

doi:10.11949/0438-1157.20210607

Abstract

Abstract:

The stable phase equilibria of ternary system CaCl₂-SrCl₂-H₂O, CaCl₂-BaCl₂-H₂O and SrCl₂-BaCl₂-H₂O at 338.15 K were studied by isothermal dissolution equilibrium method, and then the quaternary system CaCl₂-SrCl₂-BaCl₂-H₂O was studied. According to the experimental data, the phase diagram and density composition diagram of ternary system, the space diagram, phase diagram, water diagram and density composition diagram of quaternary system were drawn respectively. The results show that there is no double salt or solid solution in the quaternary system CaCl₂-SrCl₂-BaCl₂-H₂O. The stable phase diagram of the quaternary system consists of one invariant saturation point, three univariate solubility curves and three salt crystallization regions at 338.15 K, corresponding to the crystallization regions of BaCl₂·2H₂O, SrCl₂·mH₂O(m=2,6) and CaCl₂·2H₂O respectively. The solubility of the ternary system CaCl₂-SrCl₂-H₂O, CaCl₂-BaCl₂-H₂O and SrCl₂-BaCl₂-H₂O at 338.15 K were calculated by DFT model. The calculated results are basically consistent with the experimental data. The study of stable phase equilibria of quaternary and ternary systems of CaCl₂-SrCl₂-BaCl₂-H₂O can provide data basis for comprehensive development and utilization of calcium-strontium-barium resources in oilfield brine.

Key words: water salt system, phase equilibrium, solubility, thermodynamic properties, DFT model

摘要：

采用等温溶解平衡法研究338.15 K时三元体系CaCl₂-SrCl₂-H₂O、CaCl₂-BaCl₂-H₂O和SrCl₂-BaCl₂-H₂O的稳定相平衡，进一步研究四元体系CaCl₂-SrCl₂-BaCl₂-H₂O的相平衡。根据实验数据，分别绘制了三元体系的相图和密度-组成图，四元体系空间立体图、相图、水图和密度-组成图。研究结果表明：CaCl₂-SrCl₂-BaCl₂-H₂O四元体系在338.15 K时没有复盐和固溶体生成，稳定平衡相图由1个共饱点、3条单变量溶解度曲线，3个结晶区组成，分别对应BaCl₂·2H₂O结晶区、SrCl₂·mH₂O（m=2，6）结晶区和CaCl₂·2H₂O结晶区。采用DFT模型进行338.15 K三元体系CaCl₂-SrCl₂-H₂O、CaCl₂-BaCl₂-H₂O和SrCl₂-BaCl₂-H₂O的溶解度计算，计算结果与实验结果基本吻合。针对CaCl₂-SrCl₂-BaCl₂-H₂O四元体系及三元子体系的稳定相平衡研究，可为综合开发利用油田卤水中的钙-锶-钡资源提供数据基础。

关键词: 水盐体系, 相平衡, 溶解性, 热力学性质, DFT模型

CLC Number:

O 642.4

Daqun CAO,Yan JIN,Hang CHEN,Jianguo YU. Phase equilibria determination and solubility calculation of the quaternary system CaCl₂-SrCl₂-BaCl₂-H₂O at 338.15 K[J]. CIESC Journal, 2021, 72(10): 5028-5039.

曹大群,金艳,陈杭,于建国. 338.15 K时四元体系CaCl₂-SrCl₂-BaCl₂-H₂O相平衡测定及溶解度计算[J]. 化工学报, 2021, 72(10): 5028-5039.

Figures/Tables 20

References 30

1	王林, 郑秋风, 刘敏, 等. 三元体系SrCl₂+MgCl₂+H₂O 298 K相平衡测定及计算[J]. 高校化学工程学报, 2019, 33(4): 800-807.
	Wang L, Zheng Q F, Liu M, et al. Phase equilibrium measurements and simulation of the SrCl₂ + MgCl₂ + H₂O ternary system at 298 K[J]. Journal of Chemical Engineering of Chinese Universities, 2019, 33(4): 800-807.
2	胡韵. 涪陵页岩气开发污水水质分析与利用[J]. 江汉石油职工大学学报, 2017, 30(3): 75-77, 88.
	Hu Y. Wastewater quality analysis and usage for shale gas exploitation in Fuling[J]. Journal of Jianghan Petroleum University of Staff and Workers, 2017, 30(3): 75-77, 88.
3	金艳, 黄伙, 张建海. 页岩气采出水处理技术进展[J]. 广东化工, 2017, 44(16): 149-151.
	Jin Y, Huang H, Zhang J H. Technical progress of shale gas produced water treatment[J]. Guangdong Chemical Industry, 2017, 44(16): 149-151.
4	Clynne M A, Potter R W. Solubility of some alkali and alkaline earth chlorides in water at moderate temperatures[J]. Journal of Chemical & Engineering Data, 1979, 24(4): 338-340.
5	Seidell A. Solubilities of inorganic and metal organic compounds. Third edition[J]. Journal of Chemical Education, 1941, 18(8): 399.
6	Sinke G C, Mossner E H, Curnutt J L. Enthalpies of solution and solubilities of calcium chloride and its lower hydrates[J]. The Journal of Chemical Thermodynamics, 1985, 17(9): 893-899.
7	Li D D, Zeng D W, Yin X, et al. Phase diagrams and thermochemical modeling of salt lake brine systems(Ⅱ): NaCl+H₂O, KCl+H₂O, MgCl₂+H₂O and CaCl₂+H₂O systems[J]. Calphad, 2016, 53: 78-89.
8	袁梦霞, 乔秀臣. 三元体系AlCl₃+CaCl₂+H₂O, AlCl₃+FeCl₃+H₂O和CaCl₂+FeCl₃+H₂O在35℃时的相平衡[J]. 化工学报, 2017, 68(7): 2653-2659.
	Yuan M X, Qiao X C. Phase equilibria of AlCl₃+CaCl₂+H₂O, AlCl₃+FeCl₃ +H₂O and CaCl₂+FeCl₃+H₂O ternary systems at 35℃[J]. CIESC Journal, 2017, 68(7): 2653-2659.
9	Cao H Y, Zhou H, Bai X Q, et al. (Solid + liquid) phase equilibria of (Ca(H₂PO₂)₂ + CaCl₂ + H₂O) and (Ca(H₂PO₂)₂ + NaH₂PO₂ + H₂O) ternary systems at T = 323.15 K[J]. The Journal of Chemical Thermodynamics, 2016, 93: 255-260.
10	Tan L N, Wang J M, Zhou H, et al. Solid-liquid phase equilibria of Ca(H₂PO₂)₂-CaCl₂-H₂O and Ca(H₂PO₂)₂-NaH₂PO₂-H₂O ternary systems at 298.15 K[J]. Fluid Phase Equilibria, 2015, 388: 66-70.
11	Assarsson G O, Balder A. Equilibria between 18 and 114° in the aqueous ternary system containing Ca²⁺, Sr²⁺and Cl^-[J]. The Journal of Physical Chemistry, 1954, 57(7): 717-720.
12	Assarsson G O. Equilibria in aqueous systems containing Sr²⁺, K⁺, Na⁺ and Cl^-[J]. The Journal of Physical Chemistry, 1953, 57(2): 207-210.
13	Assarsson G O, Balder A. Equilibria between 18 and 100° in the aqueous ternary system containing Sr²⁺, Mg²⁺ and Cl^-[J]. The Journal of Physical Chemistry, 1954, 58(5): 416.
14	Steiger M. Thermodynamic properties of SrCl₂(aq) from 252 K to 524 K and phase equilibria in the SrCl₂-H₂O system: implications for thermochemical heat storage[J]. The Journal of Chemical Thermodynamics, 2018, 120: 106-115.
15	毕玉敬, 孙柏, 赵静, 等. 25℃时三元体系SrCl₂-CaCl₂-H₂O相平衡研究[J]. 无机化学学报, 2011, 27(9): 1765-1771.
	Bi Y J, Sun B, Zhao J, et al. Phase equilibrium in ternary system SrCl₂-CaCl₂-H₂O at 25℃[J]. Chinese Journal of Inorganic Chemistry, 2011, 27(9): 1765-1771.
16	张晓. 五元体系Na⁺,K⁺,Ca²⁺,Sr²⁺//Cl^--H₂O及其子体系323 K时相平衡实验及不确定度研究[D]. 成都: 成都理工大学, 2018.
	Zhang X. Studies on equilibria and uncertainty of the quinary system Na⁺,K⁺,Ca²⁺,Sr²⁺//Cl^--H₂O and its subsystems at 323 K[D]. Chengdu: Chengdu University of Technology, 2018.
17	Han H J, Ji X, Ma J J, et al. Water activity, solubility determination, and model simulation of the CaCl₂-SrCl₂-H₂O ternary system at 323.15 K[J]. Journal of Chemical & Engineering Data, 2018, 63(5): 1636-1641.
18	Li D, Meng L Z, Guo Y F, et al. Chemical engineering process simulation of brines using phase diagram and Pitzer model of the system CaCl₂-SrCl₂-H₂O [J]. Fluid Phase Equilibria, 2019, 484: 232-238.
19	乔占平. 三元体系BaCl₂-LaCl₃-H₂O(30℃)的相平衡[J]. 南阳师范学院学报(自然科学版), 2004, 3(12): 46-47.
	Qiao Z P. Study on the phase diagram of the LaCl₃-BaCl₂-H₂O at 30℃[J]. Journal of Nanyang Normal University, 2004, 3(12): 46-47.
20	周久龙, 吉仁塔布, 范剑明, 等. BaCl₂-NaCl-H₂O三元体系溶解度分析及应用[J]. 内蒙古石油化工, 2010, 36(11): 20-22.
	Zhou J L, Jirentabu, Fan J M, et al. Measurement and research on the solubility of BaCl₂-NaCl-H₂O system[J]. Inner Mongolia Petrochemical Industry, 2010, 36(11): 20-22.
21	朱屯. 无机盐生产中的锶钡分离[J]. 无机盐工业, 2003, 35(2): 13-15.
	Zhu T. Separation of strontium and barium in the production of inorganic chemicals[J]. Inorganic Chemicals Industry, 2003, 35(2): 13-15.
22	樊秀秀, 郭旭, 孟令宗, 等. 含锶卤水体系相平衡和热力学研究进展[J]. 广东微量元素科学, 2016, 23(4): 7-11.
	Fan X X, Guo X, Meng L Z, et al. Progresses on phase equilibria and thermodynamics of the strontium-containing brine system[J]. Guangdong Trace Elements Science, 2016, 23(4): 7-11.
23	Chen H, Bian C, Bian J W, et al. Stable solid-liquid equilibrium of the quaternary system Na⁺//Cl^-, NO₃^-, and SO₄^2--H₂O at 333.15 K[J]. Journal of Chemical & Engineering Data, 2019, 64(8): 3569-3575.
24	Qiao C Z, Zhang J, Jiang P, et al. A molecular approach for predicting phase diagrams of ternary aqueous saline solutions[J]. Chemical Engineering Science, 2020, 211: 115278.
25	Liu Y, Kermanpour F, Liu H L, et al. Molecular thermodynamic model for DNA melting in ionic and crowded solutions[J]. The Journal of Physical Chemistry B, 2010, 114(30): 9905-9911.
26	Johnson J K, Zollweg J A, Gubbins K E. The Lennard-Jones equation of state revisited[J]. Molecular Physics, 1993, 78(3): 591-618.
27	Joung I S, Cheatham T E. Determination of alkali and halide monovalent ion parameters for use in explicitly solvated biomolecular simulations[J]. J. Phys. Chem. B, 2008, 112(30): 9020-9041.
28	Mountain R D. Solvation structure of ions in water[J]. International Journal of Thermophysics, 2007, 28(2): 536-543.
29	刘燕. 应用ABEEM/MM研究Sr(Ⅱ)和Ba(Ⅱ)离子水分子体系[D]. 大连: 辽宁师范大学, 2010.
	Liu Y. The ABEEM/MM simulations of strontium(Ⅱ) and barium(Ⅱ) cation/water systems[D]. Dalian: Liaoning Normal University, 2010.
30	Cotterman R L, Schwarz B J, Prausnitz J M. Molecular thermodynamics for fluids at low and high densities (Part Ⅰ): Pure fluids containing small or large molecules[J]. AIChE Journal, 1986, 32(11): 1787-1798.

Related Articles 15

[1]	Chao HU, Yuming DONG, Wei ZHANG, Hongling ZHANG, Peng ZHOU, Hongbin XU. Preparation of high-concentration positive electrolyte of vanadium redox flow battery by activating vanadium pentoxide with highly concentrated sulfuric acid [J]. CIESC Journal, 2023, 74(S1): 338-345.
[2]	Xudong YU, Qi LI, Niancu CHEN, Li DU, Siying REN, Ying ZENG. Phase equilibria and calculation of aqueous ternary system KCl + CaCl₂ + H₂O at 298.2, 323.2, and 348.2 K [J]. CIESC Journal, 2023, 74(8): 3256-3265.
[3]	Xiaoyu YAO, Jun SHEN, Jian LI, Zhenxing LI, Huifang KANG, Bo TANG, Xueqiang DONG, Maoqiong GONG. Research progress in measurement methods in vapor-liquid critical properties of mixtures [J]. CIESC Journal, 2023, 74(5): 1847-1861.
[4]	Ke CHEN, Li DU, Ying ZENG, Siying REN, Xudong YU. Phase equilibria and calculation of quaternary system LiCl+MgCl₂+CaCl₂+H₂O at 323.2 K [J]. CIESC Journal, 2023, 74(5): 1896-1903.
[5]	Yuanjing MAO, Zhi YANG, Songping MO, Hao GUO, Ying CHEN, Xianglong LUO, Jianyong CHEN, Yingzong LIANG. Estimation of SAFT-VR Mie equation of state parameters and thermodynamic properties of C₆—C₁₀ alcohols [J]. CIESC Journal, 2023, 74(3): 1033-1041.
[6]	Wenting CHENG, Jie LI, Li XU, Fangqin CHENG, Guoji LIU. Experiment and prediction for the solubility of AlCl₃·6H₂O in FeCl₃, CaCl₂, KCl and KCl-FeCl₃solutions [J]. CIESC Journal, 2023, 74(2): 642-652.
[7]	Songtao YANG, Dongyang LI, Yuqing NIU, Xingang LI, Shaohui KANG, Hong LI, Kaikai YE, Zhiquan ZHOU, Xin GAO. Molecular simulation progress in studying thermodynamic properties and potential functions of fluorides [J]. CIESC Journal, 2022, 73(9): 3828-3840.
[8]	Yuxin REN, Runfeng XU, Wanying WANG, Pengzhong CHEN, Xiaojun PENG. Synthesis and stability study of anthraquinone dyes for color photoresist [J]. CIESC Journal, 2022, 73(5): 2251-2261.
[9]	Jiaren ZHANG, Haichao LIU. Phase equilibrium of transesterification reaction system between soybean oil and methanol [J]. CIESC Journal, 2022, 73(5): 1920-1929.
[10]	Jiahui REN, Yu LIU, Chao LIU, Lang LIU, Ying LI. Critical temperature prediction of working fluids using molecular fingerprints and topological indices [J]. CIESC Journal, 2022, 73(4): 1493-1500.
[11]	Wenxin MEN, Qingshou PENG, Xia GUI. Phase equilibrium of CO₂ hydrate in the presence of four different quaternary ammonium salts [J]. CIESC Journal, 2022, 73(4): 1472-1482.
[12]	Mingze SUN, Ning MA, Haoran LI, Haifeng JIANG, Wenpeng HONG, Xiaojuan NIU. Thermodynamic analysis of Brayton cycle of medium and low temperature supercritical CO₂ and its mixed working medium [J]. CIESC Journal, 2022, 73(3): 1379-1388.
[13]	Huaixu LI, Xiaoyan SUN, Shaohui TAO, Li XIA, Shuguang XIANG. Lumping gasoline with molecular properties and density peak clustering [J]. CIESC Journal, 2022, 73(12): 5449-5460.
[14]	Siying REN, Xudong YU, Jun LUO, Xia FENG, Zhixing ZHAO, Zhihao YAO. Phase equilibria of aqueous quaternary system Li⁺, K⁺, $N H 4 +$ // Cl^- - H₂O at 298.2 K [J]. CIESC Journal, 2022, 73(10): 4335-4344.
[15]	Xueping ZHANG, Ruizhi CUI, Shihua SANG. Experiment and calculation of phase equilibrium in ternary systems NaBr-CaBr₂-H₂O and KBr-CaBr₂-H₂O at 273.15 K [J]. CIESC Journal, 2021, 72(9): 4479-4486.

No.	液相组成/%			密度/(g/cm³)	湿渣组成/%			平衡固相
No.	CaCl₂	SrCl₂	H₂O	密度/(g/cm³)	CaCl₂	SrCl₂	H₂O	平衡固相
1,A	57.83	0.00	42.17	1.6465	—	—	—	C
2	56.43	0.54	43.03	1.6215	58.19	0.75	41.06	C
3,E	55.16	0.98	43.83	1.6192	56.44	2.85	40.71	C+S
4	53.61	1.07	45.32	1.5908	43.68	15.98	40.34	S
5	50.54	1.25	48.21	1.5750	25.76	40.35	33.89	S
6	48.12	1.32	50.56	1.5675	26.61	36.98	36.41	S
7	47.32	1.66	51.02	1.5418	22.02	44.61	33.37	S
8	42.61	3.63	53.76	1.5027	21.67	41.90	36.43	S
9	40.6	4.87	54.53	1.4785	19.80	43.78	36.42	S
10	33.15	10.51	56.34	1.4644	16.56	46.83	36.61	S
11	26.79	15.91	57.3	1.4559	10.47	55.76	33.77	S
12	19.85	22.42	57.73	1.4345	5.21	65.35	29.44	S
13	11.03	30.99	57.98	1.4493	5.78	55.26	38.95	S
14	9.05	33.38	57.57	1.4506	3.12	63.96	32.92	S
15,C	8.57	34.07	57.36	1.4564	1.89	58.87	39.24	S+SH
16	1.11	43.77	55.12	1.4963	0.71	51.31	47.98	S+SH
17,B	0.00	45.30	54.70	1.5226	—	—	—	S

No.	液相组成/%			密度/(g/cm³)	湿渣组成/%			平衡固相
No.	CaCl₂	SrCl₂	H₂O	密度/(g/cm³)	CaCl₂	SrCl₂	H₂O	平衡固相
1,A	57.83	0.00	42.17	1.6465	—	—	—	C
2	56.43	0.54	43.03	1.6215	58.19	0.75	41.06	C
3,E	55.16	0.98	43.83	1.6192	56.44	2.85	40.71	C+S
4	53.61	1.07	45.32	1.5908	43.68	15.98	40.34	S
5	50.54	1.25	48.21	1.5750	25.76	40.35	33.89	S
6	48.12	1.32	50.56	1.5675	26.61	36.98	36.41	S
7	47.32	1.66	51.02	1.5418	22.02	44.61	33.37	S
8	42.61	3.63	53.76	1.5027	21.67	41.90	36.43	S
9	40.6	4.87	54.53	1.4785	19.80	43.78	36.42	S
10	33.15	10.51	56.34	1.4644	16.56	46.83	36.61	S
11	26.79	15.91	57.3	1.4559	10.47	55.76	33.77	S
12	19.85	22.42	57.73	1.4345	5.21	65.35	29.44	S
13	11.03	30.99	57.98	1.4493	5.78	55.26	38.95	S
14	9.05	33.38	57.57	1.4506	3.12	63.96	32.92	S
15,C	8.57	34.07	57.36	1.4564	1.89	58.87	39.24	S+SH
16	1.11	43.77	55.12	1.4963	0.71	51.31	47.98	S+SH
17,B	0.00	45.30	54.70	1.5226	—	—	—	S

No.	液相组成/%			密度/(g/cm³)	湿渣组成/%			平衡固相
No.	CaCl₂	BaCl₂	H₂O	密度/(g/cm³)	CaCl₂	BaCl₂	H₂O	平衡固相
1	57.83	0.00	42.17	1.6465	—	—	—	C
2,E	54.95	0.16	44.89	1.6122	45.46	21.85	32.69	C+B
3	48.12	0.46	51.42	1.5403	31.19	30.47	38.34	B
4	31.15	3.37	65.48	1.3872	19.51	33.89	46.6	B
5	18.96	9.37	71.67	1.2995	8.72	50.16	41.12	B
6	7.84	21.09	71.07	1.3051	3.79	53.65	42.56	B
7	0.00	32.19	67.81	1.3095	—	—	—	B

No.	液相组成/%			密度/(g/cm³)	湿渣组成/%			平衡固相
No.	CaCl₂	BaCl₂	H₂O	密度/(g/cm³)	CaCl₂	BaCl₂	H₂O	平衡固相
1	57.83	0.00	42.17	1.6465	—	—	—	C
2,E	54.95	0.16	44.89	1.6122	45.46	21.85	32.69	C+B
3	48.12	0.46	51.42	1.5403	31.19	30.47	38.34	B
4	31.15	3.37	65.48	1.3872	19.51	33.89	46.6	B
5	18.96	9.37	71.67	1.2995	8.72	50.16	41.12	B
6	7.84	21.09	71.07	1.3051	3.79	53.65	42.56	B
7	0.00	32.19	67.81	1.3095	—	—	—	B

No.	液相组成/%			密度/(g/cm³)	湿渣组成/%			平衡固相
No.	SrCl₂	BaCl₂	H₂O	密度/(g/cm³)	SrCl₂	BaCl₂	H₂O	平衡固相
1	45.30	0.00	54.7	1.5226	—	—	—	S
2	40.98	0.45	58.57	1.4953	53.17	0.58	46.25	S
3	39.11	0.79	60.10	1.4804	59.39	2.14	38.47	S
4,E	37.86	1.29	60.85	1.4721	38.94	18.68	42.38	B+S
5	31.20	3.01	65.79	1.4182	10.31	57.94	31.75	B
6	19.06	11.77	69.17	1.3518	9.64	48.51	41.85	B
7	8.91	21.89	69.20	1.3259	2.48	67.39	30.13	B
8	0.00	32.19	67.81	1.3095	—	—	—	B

Phase equilibria determination and solubility calculation of the quaternary system CaCl₂-SrCl₂-BaCl₂-H₂O at 338.15 K

338.15 K时四元体系CaCl₂-SrCl₂-BaCl₂-H₂O相平衡测定及溶解度计算

RichHTML

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 20

References 30

Related Articles 15

Recommended Articles

Metrics

Comments

离子	σ/?	ε/(kJ/mol)	Z	文献
Cl^-	4.830	0.053	-1	[27]
Ca²⁺	3.170	1.886	2	[28]
Sr²⁺	3.553	0.4948	2	[29]
Ba²⁺	3.750	0.1696	2	[29]

No.	液相组成/%				干盐J?necke指数 J(CaCl₂)+J(SrCl₂)+J(BaCl₂)=100				平衡固相	密度/ (g/cm³)
No.	CaCl₂	SrCl₂	BaCl₂	H₂O	CaCl₂	SrCl₂	BaCl₂	H₂O	平衡固相	密度/ (g/cm³)
1,E₁	54.95	0	0.17	44.88	99.69	0.00	0.31	81.42	C+B	1.6122
2,E₂	55.16	0.98	0	43.86	98.25	1.75	0.00	78.13	C+S	1.6192
3,E₃	52.38	0.75	0.16	46.71	98.29	1.41	0.30	87.65	C+S	1.5933
4	43.61	1.83	0.15	54.41	95.66	4.01	0.33	119.35	B+S	1.5226
5	35.07	6.42	0.18	58.33	84.16	15.41	0.43	139.98	B+S	1.4893
6	24.68	13.91	0.26	61.15	63.53	35.80	0.67	157.40	B+S	1.4618
7	19.08	18.93	0.36	61.63	49.73	49.34	0.94	160.62	B+S	1.4705
8	14.82	22.97	0.48	61.73	38.72	60.02	1.25	161.30	B+S	1.4717
9	8.14	29.43	0.77	61.66	21.23	76.76	2.01	160.82	B+S	1.4739
10,E₄	0	37.86	1.29	60.85	0.00	96.70	3.30	155.43	B+S	1.4721

No.	液相组成/%				干盐J?necke指数 J(CaCl₂)+J(SrCl₂)+J(BaCl₂)=100				平衡固相	密度/ (g/cm³)
No.	CaCl₂	SrCl₂	BaCl₂	H₂O	CaCl₂	SrCl₂	BaCl₂	H₂O	平衡固相	密度/ (g/cm³)
1,E₁	54.95	0	0.17	44.88	99.69	0.00	0.31	81.42	C+B	1.6122
2,E₂	55.16	0.98	0	43.86	98.25	1.75	0.00	78.13	C+S	1.6192
3,E₃	52.38	0.75	0.16	46.71	98.29	1.41	0.30	87.65	C+S	1.5933
4	43.61	1.83	0.15	54.41	95.66	4.01	0.33	119.35	B+S	1.5226
5	35.07	6.42	0.18	58.33	84.16	15.41	0.43	139.98	B+S	1.4893
6	24.68	13.91	0.26	61.15	63.53	35.80	0.67	157.40	B+S	1.4618
7	19.08	18.93	0.36	61.63	49.73	49.34	0.94	160.62	B+S	1.4705
8	14.82	22.97	0.48	61.73	38.72	60.02	1.25	161.30	B+S	1.4717
9	8.14	29.43	0.77	61.66	21.23	76.76	2.01	160.82	B+S	1.4739
10,E₄	0	37.86	1.29	60.85	0.00	96.70	3.30	155.43	B+S	1.4721

盐	溶解度/%（质量）	数密度/（个/nm³）
CaCl₂	57.83	7.44
SrCl₂	45.30	3.15
BaCl₂	32.19	1.37

盐	溶解度/%（质量）	数密度/（个/nm³）
CaCl₂	57.83	7.44
SrCl₂	45.30	3.15
BaCl₂	32.19	1.37