Abstract

This study investigated the density (ρ), speed of sound (u), and refractive index ( \({n}_{{\text{D}}}\) ) of binary mixtures of diethylene glycol monobuthyl ether (DEGBE) and 2-alkanols (C₃–C₆) at various compositions and temperatures (T = 298.15, 308.15, 318.15 K) under normal pressure. The experimental data were used to compute derived properties such as excess molar volume ( \({V}_{{\text{m}}}^{{\text{E}}}\) ), excess partial molar volume ( \({\overline{V} }_{{\text{m}},{\text{i}}}^{{\text{E}}}), \mathrm{deviations in}\) isentropic compressibility (Δ \({K}_{{\text{s}}})\) , and in refractive index ( \(\Delta {n}_{D}\) ). These derived properties were fitted with the Redlich–Kister polynomial equation. A digital vibrating-tube densitometer (Anton Paar DSA 5000) was used to measure the density and speed of sound of pure substances and mixtures at different temperatures. The results revealed the intermolecular interactions and structure factors of the binary mixtures. Moreover, the Perturbed Chain Statistical Association Fluid Theory (PC-SAFT) model was applied to predict the density data of binary mixtures and compare them with the experimental data.

中文翻译：

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利用 PC-SAFT 模型研究不同温度下二甘醇单丁醚与 2-烷醇 (C3–C6) 的热力学性质

摘要

本研究研究了二乙二醇单丁醚 (DEGBE) 和二元混合物的密度 ( ρ )、声速 ( u ) 和折射率 ( \({n}_{{\text{D}}}\) )常压下不同组成和温度（T  = 298.15、308.15、318.15 K）的2-烷醇 (C ₃ –C _{6 )。}实验数据用于计算导出的属性，例如过量摩尔体积 ( \({V}_{{\text{m}}}^{{\text{E}}}\) )、过量偏摩尔体积 ( \ ({\overline{V} }_{{\text{m}},{\text{i}}}^{{\text{E}}}), \mathrm{偏差}\) 等熵压缩率 (Δ \({K}_{{\text{s}}})\)，以及折射率 ( \(\Delta {n}_{D}\) )。这些导出的属性符合 Redlich-Kister 多项式方程。使用数字振动管密度计（安东帕 DSA 5000）测量不同温度下纯物质和混合物的密度和声速。结果揭示了二元混合物的分子间相互作用和结构因素。此外，应用扰动链统计关联流体理论（PC-SAFT）模型预测二元混合物的密度数据，并将其与实验数据进行比较。