Table of Contents Author Guidelines Submit a Manuscript
International Journal of Chemical Engineering
Volume 2015, Article ID 871236, 9 pages
http://dx.doi.org/10.1155/2015/871236
Research Article

Kinetics and Thermodynamics of Oil Extraction from Jatropha curcas L. Using Ethanol as a Solvent

1Mechanical Engineering Department, Universidade Federal de Mato Grosso (UFMT), Rodovia MT-270, Km 06, s/n, Campus Rondonópolis, 78735-901 Rondonópolis, MT, Brazil
2Agricultural Engineering Department, Universidade Federal de Viçosa (UFV), Avenida Peter Henry Rolfs, s/n, Campus Viçosa, 36570-000 Viçosa, MG, Brazil
3Chemical Engineering, LafargeHolcim, Rodovia MG 170, s/n, Km 4, 35588-000 Arcos, MG, Brazil
4Agricultural and Ambiental Engineering, Bram Offshore, Rua da Quitanda, 86/Sala 401, Centro, 20091-005 Rio de Janeiro, RJ, Brazil
5Food Technology Department, Universidade Federal de Viçosa (UFV), Avenida Peter Henry Rolfs, s/n, Campus Viçosa, 36570-000 Viçosa, MG, Brazil

Received 23 July 2015; Accepted 9 November 2015

Academic Editor: Evangelos Tsotsas

Copyright © 2015 Silmara Bispo dos Santos et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In the study the yield and kinetic and thermodynamic parameters of the oil extraction process from Jatropha curcas L. using ethanol as a solvent were evaluated for different temperatures, moisture contents of the solid phase, and particle sizes. The extraction process yield increased with contact time of solid particles with the solvent until reaching equilibrium (saturation of the solvent), for all the temperatures, moisture contents, and average particle sizes. These parameters significantly influenced (95% confidence) the extracted oil yield. A convective mass transfer model was used to simulate the extraction process and estimate the kinetic and thermodynamic parameters. For all conditions evaluated, values of oil yield in the liquid phase close to equilibrium were obtained in approximately 20 min. The variations of enthalpy and entropy were positive, indicating that the process is endothermic and irreversible. Values obtained for the variation in Gibbs free energy showed that the extraction process using ethanol as a solvent is spontaneous and thermodynamically favorable for the moisture content of 0%, where the smaller the average particle size the greater the spontaneity of the process.