Abstract The purpose of this work is to study the dissolution behavior of chlorfenapyr in different solvents, and to screen out the solvents in which chlorfenapyr is purified by crystallization. In this work, the solubility of chlorfenapyr in five mono-solvents (methanol, ethanol, isopropanol, cyclohexane and ethyl acetate) and two mixed solvents (ethanol + ethyl acetate and isopropanol + ethyl acetate) was determined by gravimetric method at temperature between 288.15K and 328.15K. The results show that the solubility of chlorfenapyr in all the organic solvents increases with increasing of temperature, and ethyl acetate and cyclohexane are suitable for crystallization of chlorfenapyr. The experimental data were correlated with modified Apelblat equation, λh equation, van't Hoff equation, CNIBS/R-K model, Jouyban-Acree model and local composition model. The correlation results were in good agreement with the experimental results, and the modified Apelblat equation showed the best correlation effect. In addition, van't Hoff equation was used to calculate all thermodynamic parameters of dissolution, including enthalpy of dissolution, entropy of dissolution and Gibbs free energy. The results showed that the dissolution processes were endothermic, entropy-driven and non-spontaneous.

中文翻译：

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氯芬那定在288.15~328.15K的五种单溶剂和两种混合溶剂中的溶解平衡研究

摘要 本工作的目的是研究氯苯吡菌胺在不同溶剂中的溶解行为，筛选出可用于结晶纯化氯苯吡菌胺的溶剂。本工作采用重量法测定了氯芬那吡在五种单一溶剂（甲醇、乙醇、异丙醇、环己烷和乙酸乙酯）和两种混合溶剂（乙醇+乙酸乙酯和异丙醇+乙酸乙酯）中的溶解度，温度为288.15K和 328.15K。结果表明，氯苯吡菌胺在所有有机溶剂中的溶解度均随温度升高而增加，乙酸乙酯和环己烷适用于氯苯吡菌胺的结晶。实验数据与修正的Apelblat方程、λh方程、van't Hoff方程、CNIBS/RK模型、Jouyban-Acree 模型和局部合成模型。相关结果与实验结果吻合较好，修正的Apelblat方程显示出最佳的相关效果。此外，范特霍夫方程用于计算所有溶解热力学参数，包括溶解焓、溶解熵和吉布斯自由能。结果表明，溶解过程是吸热的、熵驱动的和非自发的。