Abstract The density and viscosity of pure liquid 2, 4-dichlorofluorobenzene and 2, 6-dichlorofluorobenzene were measured in the temperature range of (318.15–348.15) K at the local atmospheric pressure of 99.8 kPa. The saturated vapor pressures of pure 2, 4-dichlorofluorobenzene and 2, 6-dichlorofluorobenzene and the isobaric vapor-liquid equilibria (VLE) data for the 2, 4-dichlorofluorobenzene + 2, 6-dichlorofluorobenzene binary system at atmospheric pressure were determined experimentally by a modified Rose still. The density values were accurately described by DIPPR equation. The viscosity data were well correlated using the Litovitz, Ghatee and VFT, and Andrade equations, and the VFT equation shows the best accuracy. Both Antoine and Riedel equations can well describe the relationship between saturated vapor pressure and temperature, which meet the requirements of engineering design. The Riedel equation is more accurate due to the lower average relative deviation. The VLE data were successfully correlated with NRTL and Wilson activity coefficient models, and the interaction parameters were obtained. The result indicates that there is no azeotrope in the binary mixture. The above thermodynamic properties of pure component and the VLE data presented are crucial for the design and operation of distillation for the isomeric mixture separation of 2, 4-dichlorofluorobenzene + 2, 6-dichlorofluorobenzene.

中文翻译：

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2, 4-二氯氟苯和2, 6-二氯氟苯的密度、粘度、蒸气压和等压气液平衡

摘要 在(318.15-348.15) K、当地大气压99.8 kPa条件下，对纯液体2, 4-二氯氟苯和2, 6-二氯氟苯的密度和粘度进行了测量。纯 2, 4-二氯氟苯和 2, 6-二氯氟苯的饱和蒸气压和 2, 4-二氯氟苯 + 2, 6-二氯氟苯二元体系在常压下的等压气液平衡 (VLE) 数据通过实验确定一个修改过的玫瑰仍然。密度值由 DIPPR 方程准确描述。使用 Litovitz、Ghatee 和 VFT 以及 Andrade 方程，粘度数据具有良好的相关性，并且 VFT 方程显示出最佳精度。Antoine 方程和 Riedel 方程都可以很好地描述饱和蒸气压与温度之间的关系，满足工程设计的要求。由于较低的平均相对偏差，Riedel 方程更准确。VLE 数据成功地与 NRTL 和 Wilson 活动系数模型相关联，并获得了相互作用参数。结果表明二元混合物中没有共沸物。纯组分的上述热力学性质和所提供的 VLE 数据对于 2, 4-二氯氟苯 + 2, 6-二氯氟苯异构混合物分离的蒸馏设计和操作至关重要。结果表明二元混合物中没有共沸物。纯组分的上述热力学性质和所提供的 VLE 数据对于 2, 4-二氯氟苯 + 2, 6-二氯氟苯异构混合物分离的蒸馏设计和操作至关重要。结果表明二元混合物中没有共沸物。纯组分的上述热力学性质和所提供的 VLE 数据对于 2, 4-二氯氟苯 + 2, 6-二氯氟苯异构混合物分离的蒸馏设计和操作至关重要。