Experimental density data at high pressures for two novel binary systems, butan-2-ol (1) + n-octane (2) and butan-2-ol (1) + n-decane (2), are presented in this work. Measurements were conducted in the temperature and pressure ranges of 313.15–353.15 K and 0.1–20 MPa, respectively, and include the entire mixture composition range. The experimental data were successfully correlated utilizing the modified Toscani–Szwarc equation of state and comply with generally expected trends with regard to temperature and pressure. The data were also modeled by the Peng–Robinson equation of state and predicted by the perturbed chain statistical associating fluid theory (PC-SAFT) model; however, a poor representation of the data was observed for the mixtures. Excess molar volumes, thermal expansivity, and isothermal compressibility were calculated using the regressed model parameters and are also presented. Significant deviations from ideality regarding the calculated excess volume is mainly attributed to different molecule shapes and sizes, intermolecular mixture interactions, free volume changes, and interstitial accommodation.

中文翻译：

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在313.15–353.15 K和0.1–20 MPa范围内，丁烷-2-醇+正辛烷或正癸烷的实验P –ρ– T数据和建模

两种新型二元体系高压下的实验密度数据：丁-2-醇（1）+正辛烷（2）和丁-2-醇（1）+ n-癸烷（2），在这项工作中介绍。测量分别在313.15–353.15 K和0.1–20 MPa的温度和压力范围内进行，并包括整个混合物组成范围。利用修正的Toscani–Szwarc状态方程成功地关联了实验数据，并符合温度和压力方面的普遍预期趋势。数据也通过彭-罗宾逊状态方程建模，并通过扰动链统计缔合流体理论（PC-SAFT）模型进行预测；但是，混合物的数据表示不佳。使用回归模型参数计算了过量的摩尔体积，热膨胀系数和等温压缩率，并进行了介绍。