Solubility Measurements and Thermodynamic Properties of Sorbic Acid in Binary Solvent Mixtures of (Ethanol, 1-Propanol o
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Solubility Measurements and Thermodynamic Properties of Sorbic Acid in Binary Solvent Mixtures of (Ethanol, 1‑Propanol or 2‑Propanol + Water) from 283.15 to 323.15 K Bei Zhang1 · Di Wu1 · Huaxiang Zhu1 · Jing Fang2 · Lina Zhou1,3 · Baohong Hou1,3 · Wei Chen1,3 Received: 25 March 2020 / Accepted: 3 June 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The solubility data of sorbic acid in binary systems of (ethanol + water), (1-propanol + water) and (2-propanol + water) were measured from 283.15 to 323.15 K using the static equilibrium method under atmospheric pressure. It was found that the solubility of sorbic acid in the three binary solvent systems increased with increasing temperature as well as increasing initial mole fraction of organic solvent in these systems. The van’t Hoff–Jouyban–Acree model, the modified Apelblat–Jouyban–Acree model and the CNIBS/R-K model were proposed for correlating the experimental solubility values in various solution systems. Furthermore, the dissolution thermodynamic properties of Gibbs energy change (ΔsolGo), molar enthalpy change (ΔsolHo) and molar entropy change (ΔsolSo) were calculated from the experimental solubility data, using the van’t Hoff equation. The positive values of ΔsolGo, ΔsolHo and ΔsolSo indicate that these dissolution processes of sorbic acid in the solvents studied were all endothermic and entropically favorable. In addition, the change of dissolution enthalpy was the main contributor to the positive value of the molar Gibbs energy of the dissolution process. The experimental solubility and the models used in this work would be conducive to purifying sorbic acid from its crude mixtures. Keywords Sorbic acid · Binary systems · Solubility · Correlation · Thermodynamic properties
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s1095 3-020-01011-0) contains supplementary material, which is available to authorized users. * Wei Chen [email protected] 1
National Engineering Research Center of Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
2
Sinopharm Chongqing Pharmaceutical and Medical Industry Design Institute Corporation, Chongqing 400042, People’s Republic of China
3
Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, People’s Republic of China
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Vol.:(0123456789)
Journal of Solution Chemistry
1 Introduction (E,E)-hexa-2,4-dienoic acid (sorbic acid, C 6H8O2, CAS Registry No. 110-44-1, Fig. 1) is a short-chain unsaturated fatty organic acid. Sorbic acid has excellent functions as food antiseptic, fungistatic agent and flavoring agent [1, 2] in the manufacture of different kinds of products (e.g., baked goods, soft drinks, cheese, fish, fresh fruits and vegetables, etc.) [3]. Numerous reports illustrate that sorbic acid can effectively inhibit growth and reproduction of yeast and some harmful microbes [4] by acting as a mem
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