Azeotropic behaviour of (benzene+cyclohexane+chlorobenzene) ternary mixture using chlorobenzene as entrainer at 101.3kPa

Abstract

In this paper, the azeotropic behaviour of the (benzene + cyclohexane + chlorobenzene) ternary mixture was experimentally investigated with the aim of enhancing the knowledge for the feasible use of chlorobenzene as an entrainer for the azeotropic distillation of the binary azeotrope. Such a study has not been reported in the literature to the best of the authors' knowledge. (Vapour + liquid) equilibria data for (benzene + cyclohexane + chlorobenzene) at 101.3 kPa were obtained with a Othmer-type ebulliometer. Data were tested and considered thermodynamically consistent. The experimental results showed that this ternary mixture is completely miscible and exhibits an unique binary homogeneous azeotrope, an unstable node at the conditions studied, and the propitious topological characteristics (residual curve map and relative volatility) to be separated. Satisfactory results were obtained for the correlation of equilibrium compositions with the UNIQUAC activity coefficients model and also for prediction with the UNIFAC method. In both cases, low root mean square deviations of the vapour mole fraction and temperature were calculated. The capability of chlorobenzene as a modified distillation agent at atmospheric condition is discussed in terms of the thermodynamic topological analysis. A conceptual distillation scheme with reversed volatility is proposed to separate the azeotropic mixture. In order to reduce the operational cost requirements of the sequence of columns proposed, the range for optimal reflux and the ratio for feed flow conditions were studied.

Potential of metal–organic frameworks for adsorptive separation of industrially and environmentally relevant liquid mixtures

“…The unreacted benzene, present in the reactor's effluent stream must be removed for pure cyclohexane recovery. Now, separation of benzene from cyclohexane is inherently difficult by typical distillation processes, because these components in mixture form azeotropic mixtures, over a wide range of their compositions [155]. The main challenge lying ahead in C6 hydrocarbon flow stream separation process encompasses the separation of Bz over its azeotropic congener Cy, since they do possess tantalizingly close physical parameters such as, similar boiling points, related molecular geometry, close Lennard-Jones collision diameters and molecular volumes, together with miniscule relative volatilities (Table 2).…”

Bridging the Gap from Laboratory to Production: Kinetic Modeling-Guided Process Development for a Novel Epoxy Resin

“…The distillate is made up of a mixture of allyl alcohol and water which forms a minimum azeotrope depicted in Figure . In general, to overcome the azeotropic point, special techniques are applied such as extractive distillation, − azeotropic distillation, − or pressure-swing distillation. − For the separation of an aqueous allyl alcohol solution extractive distillation, eutectic solvents or phase splitting by salt addition are possible methods. Extractive distillation is selected using NMP in a molar ratio of 5.9 as an entrainer as it shows promising results for that mixture .…”

Isobaric Vapor–Liquid Equilibrium for Binary and Ternary Systems of tert-Butanol + tert-Butyl Acetate + Chlorobenzene at 101.33 kPa

“…Extractive distillation has an inherent advantage in that it can reduce the energy requirement, and the suitable entrainer plays a key role in an effective and economical process. − Chlorobenzene is an excellent entrainer because of its favorable characteristics and molecular polarity. The capability of chlorobenzene as a modified distillation agent is discussed in previous work. − In this article, the entrainer behavior of chlorobenzene in tert -butanol+ tert -butyl acetate separation has been investigated. Because reliable vapor–liquid equilibrium data of the mixture is essential to process simulation and optimization in extractive distillation processes, we have focused our research on the VLE of the tert -butanol + tert -butyl acetate + chlorobenzene system at 101.33KPa, which has not been reported yet.…”