Determination of the solubility,dissolution enthalpy and entropy of R-(+)-2-(4-hydroxyphenoxy) propanic acid in different solutions |
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| Authors: | Wei Liu Xinding Yao Ruina Fang Liang Cheng Jimju Ma |
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| Affiliation: | 1. Environment and Chemistry Engineering Department, Yellow River Conservancy Technical Institute, Kaifeng, PR China;2. Kaifeng Key Laboratory of Green Coating Materials, Kaifeng, PR China;3. School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, PR China |
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| Abstract: | The solubilities of R-(+)-2-(4-hydroxyphenoxy) propanic acid in acetone, ethyl acetate, acetonitrile, glycol ether, DMF, MIBK, n-butyl alcohol, THF and pyridine were measured at temperatures ranging from 273.15 K to 323.15 K at atmospheric pressure using a laser detecting system. First, the solubility data of R-(+)-2-(4-hydroxyphenoxy) propanic acid in selected solution were compared by the solubility parameter. Then, the solubility data were correlated by the Buchowski–Ksiazczak λh equation and modified Apelblat equation. Compared with the Apelblat equation, the Buchowski–Ksiazczak λh equation can fit the solubility data well. The dissolution enthalpy, entropy and Gibbs free energy of R-(+)-2-(4-hydroxyphenoxy) propanic acid were predicted by the van’t Hoff and Gibbs equation. |
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| Keywords: | R-(+)-2-(4-hydroxyphenoxy) propanic acid solubility dissolution enthalpy dissolution entropy dissolution Gibbs free energy |
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