Equilibrium, thermodynamics and breakthrough studies for adsorption of solanesol onto macroporous resins

The purpose of this work was to investigate the potential of macroporous resins, YPR-II and D1300, in adsorbing solanesol. The dependence of the adsorption of solanesol on solvent and temperature was studied in batch experiments. It was found that lower alkanols and low temperature were advantageous to present adsorption process. Adsorption isotherm was modeled by Freundlich and Langmuir equations. The correlation coefficient indicated that Langmuir model fitted better to the experimental data. The thermodynamic parameters such as enthalpy, Gibbs free energy and entropy changes were calculated and these values showed that solanesol adsorption process was exothermic and spontaneous. Kinetic aspects of the adsorption of solanesol by macroporous resins were studied in packed column and investigated using Adams-Bohart model. Breakthrough studies showed a good correlation between the experimental data and calculated data by the Adams-Bohart model. Thus, the Adams-Bohart model was employed to determine characteristic parameters, useful for process design, such as adsorption rate constant, saturation adsorption capacity. At last, the effects of adsorption rate constant and saturation adsorption capacity on breakthrough were predicted by reformed Adams-Bohart model. The predicted results showed that the time required to reach breakthrough point increased with increasing adsorption rate constant and saturation adsorption capacity. (C) 2007 Elsevier B.V. All rights reserved.