Correlation of Solubility and Solution Thermodynamics of DL-Malic Acid in Organic Solvents at Different Temperatures


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Abstract

The solubility of DL-malic acid in methanol, ethanol, propanol, butanol, ethyl acetate and acetonitrile in the temperature range 283–318 K was measured by acid–base titration method. The solubility of DL-malic acid increased with elevating temperature. The solubility data were correlated by the modified Apelblat, Buchowski–Książczak, Van’t Hoff, Wilson, and non-random two-liquid equations. The calculation results showed that these equations provide good prediction with the acceptable ARD values and RMSD values among all the satisfactory fitting results given by each equation. The mixing Gibbs energy, enthalpy and entropy of real solution were derived based on the Wilson equation and the measured solubility data.

About the authors

Huang Chunxiang

School of Chemical and Material Engineering, Jiangnan University

Email: yunfang@126.com
China, Wuxi, 214122

Fang Yun

School of Chemical and Material Engineering, Jiangnan University

Author for correspondence.
Email: yunfang@126.com
China, Wuxi, 214122

Xia Yongmei

School of Chemical and Material Engineering, Jiangnan University

Email: yunfang@126.com
China, Wuxi, 214122

Wang Jun

School of Petrochemical Engineering, Changzhou University

Email: yunfang@126.com
China, Changzhou, 213164

Yuan Ye

Changmao Biochemical Engineering Co., Ltd.

Email: yunfang@126.com
China, Changzhou, 213034

Liu Hang

Changmao Biochemical Engineering Co., Ltd.

Email: yunfang@126.com
China, Changzhou, 213034

Leng Yixin

School of Petrochemical Engineering, Changzhou University

Email: yunfang@126.com
China, Changzhou, 213164

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