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

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

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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 sol-ubility 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 solubil-ity of MAP increased with the increase of temperature and the increase of water mole fraction in the water-meth-anol 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 cal-culated 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 proper-ties 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.

Ammonium dihydrogen phosphateSolubilityWater-methanol system

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

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School of Chemical Engineering, Sichuan University, Chengdu 610065, China

Supported by the National Key Research and Development Program of ChinaSupported by the National Key Research and Development Program of ChinaSichuan Science and Technology Program

2016YFD02004042018RZ0145

2019

中国化学工程学报(英文版)
中国化工学会

中国化学工程学报(英文版)

CSTPCDCSCDSCIEI
影响因子：0.818
ISSN：1004-9541
年,卷(期)：2019.27(10)
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