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Effect of Hydrotropes on Solubility and Mass Transfer Coefficient of Chlorobenzene

Author Affiliations

  • 1Department of Chemical Engineering, A. C. College of Technology, Anna University, Chennai, INDIA

Res.J.chem.sci., Volume 2, Issue (8), Pages 9-13, August,18 (2012)


A comprehensive investigated on the solubility and mass transfer coefficient enhancement of chlorobenzene through hydrotropy has been undertaken. The solubility and mass transfer coefficient studies were carried out using hydrotropes such as citric acid, sodium benzoate and urea under the influence of a wide range of hydrotrope concentrations (0 to 3.0 mol/L) and different system temperatures (303 to 333 K). It has been observed that the solubility of chlorobenzene increases with increase in hydrotrope concentration and also with system temperature. A minimum hydrotrope concentration (MHC) in the aqueous phase was required to initiate significant solubilization of chlorobenzene. Consequent to the increase in solubilization of chlorobenzene, the mass transfer coefficient was also found to increase with increase in hydrotrope concentration at 303 K. A threshold value of MHC is to be maintained to have an appreciable enhancement in the mass transfer coefficient. The maximum enhancement factor, which is the ratio of the value in the presence and absence of a hydrotrope, has been determined for all sets of experimentations. The performance of hydrotropes was measured in terms of setschenow constant (Ks)and reported for all hydrotropes used in this study.


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