Abstract The present research work proposed the mole fraction solubility and mixing thermodynamic properties of piperonylonitrile in different binary solvent mixtures such as ethanol + (acetone, 1,4-dioxane, DMF and methyl acetate) at “T = 278.15 K to 323.15 K” and “p = 0.1 MPa”. The results indicated that as the temperature and mass fraction of positive solvents increased, the measured solubility of piperonylonitrile increased in all mixtures considered. Analysis using Hansen solubility parameter revealed that the affinity between piperonylonitrile and all mixed solvents was related to multiple factors. The experimental solubility of piperonylonitrile in four binary solvent mixtures was regressed by employing four thermodynamic models such as UNIQUAC, Margules, Wilson and NRTL model. It was found that the Wilson model was accurate enough to correlate the experimental solubility. Moreover, the mixing thermodynamic properties of piperonylonitrile in different mixed solvents were also estimated and discussed according to the Wilson model and experimental data. The results of the negative ΔmixG values and positive ΔmixS values demonstrated the entropy-driven and spontaneous mixing process of piperonylonitrile in all binary solvent mixtures.

中文翻译：

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胡椒腈在四种二元溶剂中的溶解度测量、模型评价及汉森溶解度参数

摘要 目前的研究工作提出了胡椒腈在乙醇+（丙酮、1,4-二恶烷、DMF 和乙酸甲酯）等不同二元溶剂混合物中在“T = 278.15 K 至 323.15 K”下的摩尔分数溶解度和混合热力学性质，以及“p = 0.1 兆帕”。结果表明，随着温度和正溶剂质量分数的增加，胡椒腈在所有考虑的混合物中的测量溶解度都增加。使用汉森溶解度参数分析表明，胡椒腈与所有混合溶剂的亲和力与多种因素有关。胡椒腈在四种二元溶剂混合物中的实验溶解度通过采用四种热力学模型如UNIQUAC、Margules、Wilson 和NRTL 模型进行回归。发现威尔逊模型足够准确以关联实验溶解度。此外，还根据Wilson模型和实验数据对胡椒腈在不同混合溶剂中的混合热力学性质进行了估计和讨论。负 ΔmixG 值和正 ΔmixS 值的结果证明了胡椒基腈在所有二元溶剂混合物中的熵驱动和自发混合过程。