磷酸二氢钾在乙腈-水溶剂中溶解度的测定与关联
收稿日期: 2021-03-08
网络出版日期: 2022-03-14
基金资助
国家自然科学基金资助项目(21868014)
Determination and correlation of solubility of potassium dihydrogen phosphate in acetonitrile-water solvent
Received date: 2021-03-08
Online published: 2022-03-14
采用静态平衡法测定了293.15~318.15 K条件下磷酸二氢钾在乙腈-水溶剂中的溶解度,采用Apelblat模型对实验数据进行拟合,计算了磷酸二氢钾的溶解焓。结果表明：Apelblat模型能较好地关联磷酸二氢钾在乙腈-水溶剂中的溶解度,回归相关系数R2大于0.97;平均相对误差小于5%;在乙腈质量分数为0~0.838时,磷酸二氢钾的溶解焓为15.12~55.30 kJ/mol。得到了适用于磷酸二氢钾-乙腈-水体系的Apelblat模型,可为磷酸二氢钾的盐析结晶工艺提供热力学数据。
关键词： 磷酸二氢钾; 乙腈; 溶解度; Apelblat模型
张焕焕 , 程卓 , 汤秀华 , 张峰榛 . 磷酸二氢钾在乙腈-水溶剂中溶解度的测定与关联[J]. 无机盐工业, 2022 , 54(1) : 83 -85 . DOI: 10.19964/j.issn.1006-4990.2021-0135
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
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