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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received August 20, 2012
Accepted December 6, 2012

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hydrotropic effect and thermodynamic analysis on the solubility and mass transfer coefficient enhancement of ethylbenzene

Antony Bertie Morais Chinnakannu Jayakumar Nagarajan Nagendra Gandhi^†

Department of Chemical Engineering, A. C. College of Technology, Anna University, Chennai 600025, India

Korean Journal of Chemical Engineering, April 2013, 30(4),
10.1007/s11814-012-0213-y

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Abstract

Concentrated aqueous solutions of a large number of hydrotropic agents, urea, nicotinamide, and sodium salicylate, have been employed to enhance the aqueous solubilities of poorly water soluble organic compounds. The influence of a wide range of hydrotrope concentrations (0-3.0mol·L^(-1)) and different system temperatures (303-333 K) on the solubility of ethylbenzene has been studied. The solubility of ethylbenzene increases with increase in hydrotrope_x000D_ concentration and also with system temperature. Consequent to the increase in the solubility of ethylbenzene, the mass transfer coefficient was also found to increase with increase in hydrotrope concentration at 303 K. The enhancement factor, which is the ratio of the value in the presence and absence of a hydrotrope, is reported for both solubility and mass transfer coefficient of ethylbenzene. The Setschenow constant, Ks, a measure of the effectiveness of a hydrotrope, was determined for each case. To ascertain the hydrotropic aggregation behavior of ethylbenzene, thermodynamic parameters such as Gibb’s free energy, enthalpy, and entropy of ethylbenzene were determined.

Keywords

Ethylbenzene Hydrotropy Solubility Mass Transfer Coefficient Sodium Salicylate

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