Measurement and correlation of solubility of diphenyl sulfoxide in several solvents

doi:10.11949/j.issn.0438-1157.20170799

Abstract

Abstract:

The measurement of solubility of diphenyl sulfoxide in ethanol, ethyl acetate, toluene, acetone, chloroform and a series of different concentrations of ethanol-water binary solvent mixtures was conducted experimentally from 288.30-334.32 K under atmospheric pressure with the synthetic method. The data showed that the solubility in the above five pure solvents is in the order:chloroform > acetone > toluene > ethyl acetate > ethanol at the desired temperatures. The solubility in ethanol-water binary solvent mixtures increased rapidly with the increase of ethanol concentration. Further, the dissolution process was an endothermic entropy-increasing process and the enthalpy change played a major influence to the Gibbs energy change. Moreover, the solubility of diphenyl sulfoxide in the selected solvent decreased with the increase of the Gibbs energy change. The data was correlated by the modified Apelblat equation and van't Hoff equation. Besides, the values of solubility in ethanol-water binary solvent mixtures were fitted by Jouban-Acree equation. The fitting results agreed well with the data. The solid-liquid equilibrium data provides suitable solvents for the synthesis and purification of diphenyl sulfoxide.

Key words: diphenyl sulfoxide, dissolution, phase equilibria, mixed solvents, enthalpy, entropy

摘要：

在温度288.30～334.32 K、常压条件下，采用合成法测定二苯基亚砜在乙醇、乙酸乙酯、甲苯、丙酮、氯仿以及一系列浓度的乙醇-水混合溶剂中的溶解度。实验结果表明，在相同温度下，5种纯溶剂中二苯基亚砜的溶解度大小顺序如下，氯仿 > 丙酮 > 甲苯 > 乙酸乙酯 > 乙醇；乙醇-水混合溶剂中溶解度随着乙醇浓度下降而迅速降低；该溶解过程为吸热熵增过程，且随着溶解Gibbs斯自由能增大，溶解度减小。数据采用改进的Apelblat方程和van’t Hoff方程进行拟合，在乙醇-水混合溶剂中的溶解度数据还采用Jouban-Acree方程拟合。拟合结果与实验数据基本吻合。测定的固液平衡数据可为二苯基亚砜的合成与提纯等过程的溶剂选择提供依据。

关键词: 二苯基亚砜, 溶解, 相平衡, 混合溶剂, 焓, 熵

CLC Number:

O642.4⁺2

OUYANG Bo, KONG Ming, QIAN Chao, CHEN Xinzhi. Measurement and correlation of solubility of diphenyl sulfoxide in several solvents[J]. CIESC Journal, 2018, 69(4): 1307-1314.

欧阳博, 孔明, 钱超, 陈新志. 二苯基亚砜在有机溶剂中的溶解度测定和拟合[J]. 化工学报, 2018, 69(4): 1307-1314.

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