Title: Thermodynamic aggregation behaviour of p-cymene in hydrotropic solution

Authors: N. Arunodhaya; N. Nagendra Gandhi

Addresses: Department of Petroleum Engineering, Rajiv Gandhi College of Engineering, Sriperumbudur-602105, Tamilnadu, India ' Department of Chemical Engineering, A.C.Tech, Anna University, Chennai-600025, Tamilnadu, India

Abstract: The paper deals with the thermodynamic properties and aggregation behaviour of p-cymene through hydrotropy. Different hydrotropes namely urea, resorcinol, sodium cumene sulfonate and pyrogallol has been used to study the solubility under a wide range of hydrotrope concentrations (0 to 3.00 mol.kg⁻¹) and different system temperatures (303.15 to 333.15 K). The effectiveness of hydrotrope with respect to the system was measured by Setschenow constant KS and reported for all hydrotropes used in this study. The influence of different system temperatures on thermodynamic properties like standard Gibbs free energy change (ΔG°), standard enthalpy change (ΔH°) and standard entropy change (ΔS°) of solubilisation with respect to p-cymene has been ascertained. The aggregation behaviour between the solute and the hydrotrope and among the hydrotrope molecules have also been studied using step wise association model.

Keywords: hydrotropy; solubilisation; association constant; standard Gibbs free energy change; standard enthalpy change; standard entropy change; association model; FTIR.

DOI: 10.1504/IJESD.2018.094038

International Journal of Environment and Sustainable Development, 2018 Vol.17 No.2/3, pp.258 - 272

Received: 10 Apr 2017
Accepted: 13 Feb 2018
Published online: 13 Aug 2018 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article