Equilibrium, Kinetic, and Thermodynamic Studies for Crude Structured-Lipid Deacidification Using Strong-Base Anion Exchange Resin

Abstract

This study presents the adsorption behavior of strongbase anion exchange D202 resin for the elimination of free fatty acids (FFAs) from structure-lipid in nonpolar solvent. The kinetics and thermodynamic behaviors that govern FFAs removal by D202 resin were investigated, and appropriate equilibrium isotherm and kinetics models for the removal in batch experiments were identified. Both the Freundlich and Langmuir adsorption isotherm models were fitted to the experimental results with the best fit obtained by the latter. The adsorption capacity of D202 resin was 235.69 mg•g −1 , as calculated from the nonlinear model of the Langmuir adsorption. The experimental data from the batch adsorption processes were analyzed in terms of the parameters from three adsorption kinetics models, namely, the liquid-film diffusion, the intraparticle, and the chemical-reaction models, to estimate the fit for the adsorption in these systems. The outcomes indicate that the adsorption kinetics between the free fatty acid ions and resin are controlled by liquid-film diffusion as the rate-determining step. In addition, the activation energy (E a ) and the changes in the Gibbs free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) obtained from the thermodynamic studies reveal that the ion exchange adsorption of FFAs on D202 resin is a spontaneous, endothermic, and entropy-driven process.

Magnetic Solid Base Catalyst Fe3O4@Gly Used as Acid‐Resistant Catalyst for Biodiesel Production

“…Thus far, the calcined basic hydrotalcite, basic anion‐exchange resins, basic ionic liquids, egg shell, etc. have been reported for application in biodiesel production . However, there have been problems resulting in costly production of biodiesel, among which separation of the catalyst was a key one, which needs to be solved effectively.…”

Desacidificação e produção de biodiesel no processamento de óleo de soja utilizando resina aniônica

“…Posteriormente, o comportamento da adsorção de AGLs foi estudado para esta mesma resina (D202) a partir de lipídios estruturados com solvente não polar (hexano) (Wu et al, 2016).…”

“…A medida que aumentou-se a concentração inicial de AGL ocorreu um aumento da quantidade de adsorbato adsorvido, até que a saturação da resina fosse obtida, como foi também relatado por Wu et al (2016), que estudaram a adsorção de AGL a partir de lipídios estruturados com solvente não polar usando a resina aniônica forte D202.…”