Solubility and solution thermodynamics of ammonium dihydrogen phosphate in the water-methanol system

Dejun Xu; Dehua Xu; Yanjun Zhong; Tao Luo; Xiushan Yang; Zhiye Zhang; Lin Yang; Xinlong Wang

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Solubility and solution thermodynamics of ammonium dihydrogen phosphate in the water-methanol system

Chemical Engineering Thermodynamics | Updated：2026-01-06

- Solubility and solution thermodynamics of ammonium dihydrogen phosphate in the water-methanol system
- Chinese Journal of Chemical Engineering Vol. 27, Issue 10, Pages: 2518-2525(2019)
- Affiliations：
  
  School of Chemical Engineering, Sichuan University,Chengdu,China,610065
- Author bio：
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- DOI：
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- Published：2019
- Accepted：
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Dejun Xu, Dehua Xu, Yanjun Zhong, Tao Luo, Xiushan Yang, Zhiye Zhang, Lin Yang, Xinlong Wang. Solubility and solution thermodynamics of ammonium dihydrogen phosphate in the water-methanol system[J]. Chinese Journal of Chemical Engineering, 2019, 27(10): 2518-2525.
DOI：

Dejun Xu, Dehua Xu, Yanjun Zhong, Tao Luo, Xiushan Yang, Zhiye Zhang, Lin Yang, Xinlong Wang. Solubility and solution thermodynamics of ammonium dihydrogen phosphate in the water-methanol system[J]. Chinese Journal of Chemical Engineering, 2019, 27(10): 2518-2525. DOI：

摘要

Abstract

The solubility of ammonium dihydrogen phosphate (MAP) in the water-methanol system is essential for antisolvent crystallization studies. To investigate the effect of methanol on the solubility of MAP in water

the solubility of MAP in the water-methanol system was determined by dynamic method and static equilibrium method at temperatures ranging from 293.2 to 343.2 K at atmospheric pressure. Results showed that the solubility of MAP increased with the increase of temperature and the increase of water mole fraction in the water-methanol system. The experimental solubility data were correlated with the modified Apelblat equation

the combined nearly ideal binary solvent/Redlich-Kister (CNIBS/R-K) model and the Jouyban-Acree model. The calculated results based on these three models were in very good agreement with the experimental data with the average relative deviations of 0.65%

0.97%

and 5.38%

respectively. Simultaneously

the thermodynamic properties of the MAP dissolution process in the water-methanol system

including Gibbs energy change

enthalpy

and entropy were obtained by the Van't Hoff equation

which can be used to assess the crystallization process.

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