六水氯化镁在六种多元醇中溶解度的测定和关联

doi:10.19964/j.issn.1006-4990.2021-0097

Abstract

Abstract:

Solubility of magnesium chloride hexahydrate is an important basic data in comprehensive utilization of magnesium salts.The static equilibrium method was used to determine the content of magnesium chloride hexahydrate in 1,2-propanedi-ol,1,3-propanediol,1,3-butanediol,diethylene glycol,triethylene glycol,and dipropylene glycol（278.15~328.15 K）.The experimental results showed that the solubility of magnesium chloride hexahydrate in six polyols increased with the increase of temperature,among which the solubility of diethylene glycol was the largest,and the solubility of diethylene glycol changed more obviously with temperature than other polyols.The Apelblat equation,λh equation,Van′t Hoff equation and polynomial equation were used to correlate the solubility data,and the results were good.Among them,the fitting results of Apelblat equa-tion and polynomial equation were better than other equations.The Van′t Hoff equation was used to calculate the dissolution enthalpy,dissolution entropy and Gibbs free energy of the six systems.These results had important reference value for the separation and extraction of magnesium salts and the preparation of magnesium-based functional materials.

Key words: magnesium chloride hexahydrate, polyols, solubility, solubility model

CLC Number:

TQ132.2

CHEN Yunfei,MAO Lili,LIU Dan,WANG Haizeng. Measurement and correlation of solubility of magnesium chloride hexahydrate in six polyols[J]. Inorganic Chemicals Industry, 2021, 53(12): 85-90.

Figures/Tables 8

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T/K	x₁
T/K	1,2-丙二醇	1,3-丙二醇	1,3-丁二醇	一缩二乙二醇	二缩三乙二醇	一缩二丙二醇
278.15	0.369 6	0.386 1	0.356 8	0.436 1	0.390 8	0.304 2
283.15	0.379 6	0.400 2	0.364 7	0.446 4	0.404 5	0.312 8
288.15	0.388 5	0.412 4	0.374 1	0.453 2	0.422 1	0.325 7
293.15	0.397 1	0.426 2	0.383 9	0.465 8	0.437 9	0.338 6
298.15	0.405 3	0.438 1	0.396 9	0.478 9	0.453 6	0.352 3
303.15	0.414 2	0.451 1	0.404 1	0.487 7	0.475 6	0.365 9
308.15	0.425 8	0.462 1	0.414 9	0.502 2	0.492 5	0.378 5
313.15	0.436 2	0.473 9	0.425 8	0.513 1	0.516 8	0.392 1
318.15	0.443 5	0.488 3	0.440 9	0.522 8	0.535 7	0.406 8
323.15	0.453 4	0.496 3	0.452 5	0.532 1	0.557 8	0.421 4
328.15	0.465 7	0.512 9	0.465 2	0.545 3	0.583 9	0.441 3

溶剂	A₁	B₁	C₁	RAD/%
1,2-丙二醇	-15.463	302.639	2.378	0.211 6
1,3-丙二醇	3.566	-628.692	-0.401	0.210 0
1,3-丁二醇	-33.525	1 053.395	5.101	0.200 3
一缩二乙二醇	-9.321	35.018	1.486	0.280 0
二缩三乙二醇	-43.786	1 311.884	6.775	0.224 2
一缩二丙二醇	-32.099	821.602	4.966	0.275 7
平均值	—	—	—	0.274 6

溶剂	λ	h	RAD/%
1,2-丙二醇	-0.494	3 369.724	0.742 9
1,3-丙二醇	-0.429	2 422.762	0.940 4
1,3-丁二醇	-0.417	3 143.828	0.496 6
一缩二乙二醇	-0.592	2 273.479	0.752 6
二缩三乙二醇	0.007	1 446.312	0.275 2
一缩二丙二醇	-0.217	3 031.885	0.601 6
平均值	—	—	0.616 2

溶剂	A₂	B₂	RAD/%
1,2-丙二醇	0.501	-417.152	0.303 2
1,3-丙二醇	0.875	-507.305	0.220 3
1,3-丁二醇	0.724	-491.524	0.544 9
一缩二乙二醇	0.655	-414.808	0.324 9
二缩三乙二醇	1.717	-743.853	0.702 4
一缩二丙二醇	1.256	-684.774	0.495 9
平均值	—	—	0.473 2

溶剂	A₃	B₃	C₃	D₃	RAD/%
1,2-丙二醇	6.822	-5.860	0.019	-1.733	0.189 1
1,3-丙二醇	1.935	0.000	0.057	-5.881	0.161 2
1,3-丁二醇	6.200	-4.647	0.013	-1.061	0.213 7
一缩二乙二醇	-2.852	0.000	-0.077	7.878	0.301 0
二缩三乙二醇	2.284	-3.837	-0.002	0.548	0.223 0
一缩二丙二醇	1.242	0.000	0.030	-2.897	0.280 3
平均值	—	—	—	—	0.258 8

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Inorganic Acid-Base-Salt Committee of CIESC

Measurement and correlation of solubility of magnesium chloride hexahydrate in six polyols

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溶剂	ΔH_sol^o / （J·mol^-1）	ΔS_sol^o / （J·mol^-1·K^-1）	ΔG_sol^o / （J·mol^-1）	ξ_H /%	ξ_TS /%
1,2-丙二醇	3 468.19	4.16	2 211.90	73.41	26.59
1,3-丙二醇	4 217.69	7.30	2 010.81	65.65	34.35
1,3-丁二醇	4 086.50	6.03	2 262.17	69.14	30.86
一缩二乙二醇	3 448.73	5.42	1 809.73	67.79	32.21
二缩三乙二醇	6 184.37	14.30	1 860.00	58.85	41.15
一缩二丙二醇	5 693.18	10.52	2 513.52	64.16	35.84

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