This experimental work describes the thermodynamically consistent determinations of the phase equilibria at the isobaric conditions of 50, 75, and 94 kPa covering the temperature range from 353 to 402 K; the isobaric–isothermal surface tensions and the isobaric–isothermal liquid dynamic viscosities at 101.3 kPa and 298.15 K and over the entire mole fraction range for the propan-1-ol + dibutyl ether binary mixture. The experimental measurements of phase equilibria are measured in an all-glass dynamic vapor–liquid cell. The isobaric–isothermal surface tensions are measured in a maximum differential bubble pressure tensiometer, whereas the isobaric–isothermal liquid viscosities are measured in a Stabinger viscometer. Based on the experimental results of the vapor–liquid equilibria, this binary system exhibits a positive deviation from the ideal behavior, showing an estimated minimum temperature azeotrope at 50 and 75 kPa. The azeotropic concentration increases with pressure and/or temperature and ends at the pure propan-1-ol. The surface tension of the explored binary mixture shows a negative departure from the linear behavior of the surface tension, and an aneotropic point is detected near pure dibutyl ether; after this azeotropicpoint, the surface tension increases as the propan-1-ol liquid mole fraction increases. The liquid dynamic viscosity increases as the propan-1-ol liquid mole fraction increases. The reported results for both the surface tension and liquid dynamic viscosity agree with previous works. Wisniak and Fredenslund’s thermodynamic consistency evaluation confirms the reliability of the reported vapor–liquid equilibrium data, which are also correlated with four activity coefficient models, namely, the three-suffix Margules model, the Wilson model, the nonrandom two-liquid (NRTL) model, and the universal quasichemical (UNIQUAC) group contribution model. On the bases of these results, the three-suffix Margules activity coefficient model provides the lowest deviation. The experimental determinations of the isobaric–isothermal surface tension and the isobaric–isothermal liquid dynamic viscosity of the binary mixture are correlated with the mole fraction by using a three-order Redlich–Kister-type polynomial showing a low deviation.

中文翻译：

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1-丙醇 + 二丁基醚二元混合物的汽液平衡、表面张力和动态粘度

该实验工作描述了在 50、75 和 94 kPa 等压条件下，在 353 到 402 K 的温度范围内对相平衡的热力学一致性测定；101.3 kPa 和 298.15 K 以及 1-丙醇 + 二丁醚二元混合物的整个摩尔分数范围内的等压-等温表面张力和等压-等温液体动态粘度。相平衡的实验测量是在全玻璃动态汽液池中测量的。等压-等温表面张力在最大差压气泡压力张力计中测量，而等压-等温液体粘度在 Stabinger 粘度计中测量。根据汽液平衡的实验结果，这个二元系统表现出与理想行为的正偏差，显示了 50 和 75 kPa 的估计最低温度共沸物。共沸浓度随压力和/或温度而增加，并以纯丙-1-醇结束。所探索的二元混合物的表面张力与表面张力的线性行为呈负背离，并且在纯二丁醚附近检测到各向异性点；在这之后共沸点，表面张力随着丙-1-醇液体摩尔分数的增加而增加。液体动力粘度随着丙-1-醇液体摩尔分数的增加而增加。表面张力和液体动力粘度的报告结果与以前的工作一致。Wisniak 和 Fredenslund 的热力学一致性评价证实了所报告的汽液平衡数据的可靠性，这些数据也与四个活度系数模型相关，即三后缀 Margules 模型、Wilson 模型、非随机二液 (NRTL) 模型, 以及通用准化学 (UNIQUAC) 群贡献模型。基于这些结果，三后缀的 Margules 活动系数模型提供了最低的偏差。