This work has been dedicated to modeling the interfacial tension of hexane $$+$$ alcohol mixtures in the temperature range of 283.15 K to 313.15 K. The cubic plus association equation of state is applied to the liquid–vapor phase equilibrium calculations. The binary interaction parameters are obtained according to the experimental phase equilibrium data. The linear gradient theory is used as a predictive and adjustment approach to describe the interfacial tension of hexane $$+$$ alcohol mixtures. The influence parameters of the pure components were correlated with the temperature and the symmetric parameters were correlated with the temperature and with the carbon number of the alcohol. The results of this work show that the equation of state used is capable of simultaneously representing the phase equilibrium and interfacial tension of the mixtures studied. Despite using the simplified version of the gradient theory, the results obtained in the interfacial tension are in agreement with those published in the literature.

中文翻译：

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使用线性梯度理论和三次加关联状态方程模拟不同温度下己烷 $$+$$ 酒精混合物的界面张力

这项工作致力于模拟己烷 $$+$$ 醇混合物在 283.15 K 至 313.15 K 温度范围内的界面张力。立方加关联状态方程应用于液相-气相平衡计算。根据实验相平衡数据获得二元相互作用参数。线性梯度理论被用作一种预测和调整方法来描述己烷 $$+$$ 醇混合物的界面张力。纯组分的影响参数与温度相关，对称参数与温度和醇的碳数相关。这项工作的结果表明，所使用的状态方程能够同时表示所研究混合物的相平衡和界面张力。尽管使用了梯度理论的简化版本，但在界面张力中获得的结果与文献中发表的结果一致。