磷酸二氢钾在乙腈-水溶剂中溶解度的测定与关联

doi:10.19964/j.issn.1006-4990.2021-0135

Abstract

Abstract:

The solubility of potassium dihydrogen phosphate（KDP） in acetonitrile-water solvent was determined by the static equilibrium method in the temperature range of 293.15 K to 318.15 K.The experimental data was fitted with Apelblat model and the dissolution enthalpy of KDP was calculated.The results showed that the Apelblat model could correlate the solubility of KDP in acetonitrile-water solvent.The fitting correlation coefficient R² was above 0.97,and the average relative deviation was less than 5%.The KDP dissolution enthalpy ranging from 15.12 kJ/mol to 55.30 kJ/mol with the mass fraction of acetoni-trile varying between 0 and 0.838.The Apelblat model suitable for the system of KDP-acetonitrile-water was obtained,which could provide thermodynamic date for the salt-out crystallization process of KDP.

Key words: potassium dihydrogen phosphate, acetonitrile, solubility, Apelblat model

CLC Number:

TQ131.13

ZHANG Huanhuan,CHENG Zhuo,TANG Xiuhua,ZHANG Fengzhen. Determination and correlation of solubility of potassium dihydrogen phosphate in acetonitrile-water solvent[J]. Inorganic Chemicals Industry, 2022, 54(1): 83-85.

Figures/Tables 6

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Table 1

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Table 3

References 12

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T/K	x_lit/10^-3	x_exp/10^-3	δ/%
298.2	32.58	31.52	3.353
303.2	35.66	35.07	1.689
308.2	39.14	38.63	1.317
313.2	42.91	42.98	0.155
318.2	46.59	47.93	2.801
平均相对误差			1.863

w	A	B	C	R²	ARD/ %	RSMD/ 10^-4
0.000	-303.19	12 072.26	45.50	0.998	0.545	2.17
0.244	-362.48	14 005.05	54.65	0.971	3.483	7.28
0.463	-323.09	10 814.23	49.49	0.979	4.165	6.53
0.564	-1 137.63	46 955.44	171.06	0.987	4.266	4.75
0.838	1 265.63	-63 441.00	-186.02	0.992	3.977	0.83

w	ΔH_sol/（kJ·mol^-1）	w	ΔH_sol/（kJ·mol^-1）
0.000	15.12	0.564	43.78
0.244	22.27	0.838	55.30
0.463	35.69

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Determination and correlation of solubility of potassium dihydrogen phosphate in acetonitrile-water solvent

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