Abstract The solubility of coumarin in three aqueous solutions of acidic deep eutectic solvents (DESs) based on choline chloride (ChCl) as hydrogen bond acceptor (HBA) with some carboxilic acids (propionic acid, lactic acid and acetic acid) as hydrogen bond donors (HBD) have been measured using the shake flask method at T = (298.15 to 313.15) K. According to obtained results, the solubility of coumarin increases with increasing the weight fraction of ChCl/propionic acid more than 100-fold. The experimental solubility data were correlated by electrolyte Nonrandom Two-Liquid (e-NRTL),Wilson and UNIQUAC activity coefficient models. Then, the dissolution thermodynamic properties, enthalpy, Gibbs free energy and entropy were calculated based on Gibbs and van't Hoff equations to investigate the solvation behavior of coumarin in the aqueous DES solutions.

中文翻译：

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基于氯化胆碱的酸性低共熔溶剂水溶液中香豆素溶解度的测定及相关性

摘要 香豆素在以氯化胆碱 (ChCl) 作为氢键受体 (HBA) 和一些羧酸 (丙酸、乳酸和乙酸) 作为氢键供体的酸性低共熔溶剂 (DESs) 的三种水溶液中的溶解度。 HBD) 已使用摇瓶法在 T = (298.15 至 313.15) K 下进行测量。根据所得结果，香豆素的溶解度随着 ChCl/丙酸的重量分数增加 100 倍以上而增加。实验溶解度数据通过电解质非随机双液体 (e-NRTL)、Wilson 和 UNIQUAC 活度系数模型相关联。然后，根据 Gibbs 和 van' 计算溶解热力学性质、焓、Gibbs 自由能和熵