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Fluid Phase Topology of Benzene + Cyclohexane + 1-Propanol at 101.3  kPa

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Abstract

Isobaric vapor–liquid equilibria for the benzene + cyclohexane + 1-propanol ternary mixture were experimentally investigated at atmospheric pressure. Data were tested and considered thermodynamically consistent by means of the McDermott and Ellis method. The experimental results showed that this ternary mixture is completely miscible and exhibits three binary minimum homogeneous azeotropes and a ternary minimum azeotrope at the studied conditions. Satisfactory results were obtained for correlation of equilibrium compositions with the UNIQUAC equation and also for prediction with the UNIFAC method. In both cases, low root-mean-square deviations of the vapor mole fraction and temperature were calculated. The capability of 1-propanol as a modified distillation agent at atmospheric conditions is discussed in terms of thermodynamic topological analysis. However, because of the complex topology of the ternary mixture, it leads to a distillation scheme with two columns specifying ternary azeotrope recycling and difficult operation. Thus, this compound is not recommended as a separation agent for the binary benzene + cyclohexane azeotrope.

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Andrade, R.S., Iglesias, M. Fluid Phase Topology of Benzene + Cyclohexane + 1-Propanol at 101.3  kPa. Int J Thermophys 36, 1498–1518 (2015). https://doi.org/10.1007/s10765-015-1922-3

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