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Alcoholic extraction of vegetable oils: study of the solid-liquid equilibrium and the stage of the recovery of the solvent

Abstract

The present research project aims to study the technical viability of the use of less aggressive solvents, as substitutes for hexane, in the process of the extraction of vegetable oils from solid matrices. The use of alcoholic solvents as substitutes for hexane offers considerably attractive advantages from the environmental point of view, given that the suggested solvent is produced via biotechnology, does not generate toxic waste, presents a lower handling risk because of its lower degree of inflammability and is considered safe for human health. Advantages from the economic point of view are also evident, given that ethanol is produced on a large scale in Brazil and can easily be recovered, for subsequent re-use in the process. Although some advantages to the substitution of hexane by ethanol are evident, there are lacunae which need to be addressed through a systematized study of the solid-liquid extraction process. As a first effort in the direction of implementing the use of ethanol as an extractant of vegetable oils from solid matrices an experimental study of the extraction is proposed with the determination of curves of equilibrium and kinetics in thermostatic equipment. In these trials, the objective is to monitor indices of quality of the oil extracted such as: free fatty acids, phosphatides, color and unsaponifiable compounds, principally, antioxidant and vitamin compounds. In addition, it is intended to ascertain the optimum conditions of contact between solid and solvent, such as: preparation of the seeds, solid rate: solvent, extraction temperature, contact time, recovery of solvent, among others. On this last topic, recovery of solvent, what will mainly be evaluated is the viability of using a deacidification technique by liquid-liquid extraction, using ethanol as solvent, allied to the process of oil extraction from the oleaginous matrix using an alternative solvent. (AU)

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Scientific publications (7)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
OLIVEIRA, CASSIA M.; GARAVAZO, BRUNA R.; RODRIGUES, CHRISTIANNE E. C. Liquid-liquid equilibria for systems composed of rice bran oil and alcohol-rich solvents: Application to extraction and deacidification of oil. Journal of Food Engineering, v. 110, n. 3, p. 418-427, JUN 2012. Web of Science Citations: 23.
OLIVEIRA, RAMON; OLIVEIRA, VINICIUS; ARACAVA, KEILA KAZUE; RODRIGUES, CHRISTIANNE ELISABETE DA COSTA. Effects of the extraction conditions on the yield and composition of rice bran oil extracted with ethanol-A response surface approach. FOOD AND BIOPRODUCTS PROCESSING, v. 90, n. C1, p. 22-31, JAN 2012. Web of Science Citations: 43.
CHIYODA, CRISTINA; PEIXOTO, ELAINE C. D.; MEIRELLES, ANTONIO J. A.; RODRIGUES, CHRISTIANNE E. C. Liquid-liquid equilibria for systems composed of refined soybean oil, free fatty acids, ethanol, and water at different temperatures. Fluid Phase Equilibria, v. 299, n. 1, p. 141-147, DEC 15 2010. Web of Science Citations: 19.
CUEVAS, MAITE S.; RODRIGUES, CHRISTIANNE E. C.; GOMES, GIOVANNA B.; MEIRELLES, ANTONIO J. A. Vegetable Oils Deacidification by Solvent Extraction: Liquid-Liquid Equilibrium Data for Systems Containing Sunflower Seed Oil at 298.2 K. JOURNAL OF CHEMICAL AND ENGINEERING DATA, v. 55, n. 9, p. 3859-3862, SEP 2010. Web of Science Citations: 7.
DA COSTA RODRIGUES, CHRISTIANNE ELISABETE; OLIVEIRA, RAMON. Response surface methodology applied to the analysis of rice bran oil extraction process with ethanol. INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY, v. 45, n. 4, p. 813-820, APR 2010. Web of Science Citations: 23.
CUEVAS, MAITE S.; RODRIGUES, CHRISTIANNE E. C.; MEIRELLES, ANTONIO J. A. Effect of solvent hydration and temperature in the deacidification process of sunflower oil using ethanol. Journal of Food Engineering, v. 95, n. 2, p. 291-297, NOV 2009. Web of Science Citations: 20.
RODRIGUES‚ C.E.C.; PEIXOTO‚ E.C.D.; MEIRELLES‚ A.J.A. Phase equilibrium for systems composed by refined soybean oil+ commercial linoleic acid+ ethanol+ water‚ at 323.2 K. Fluid Phase Equilibria, v. 261, n. 1, p. 122-128, 2007.

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