Solvent recovery from systems containing crude sesame seed oil and short-chain alcohols at different temperatures and local pressure

Author(s)

Capellini, Maria C. ^[1] ; Goncalves, Daniel ^{[1, 2]} ; Soares, Ingrid D. ^[1] ; Almeida, Camila H. ^[1] ; Margoto, Cristiane M. ^[1] ; Koshima, Cristina C. ^[1] ; Rodrigues, Christianne E. C. ^[1]

Affiliation

^[1] Univ Sao Paulo, Fac Zootecnia & Engn Alimentos FZEA, Dept Engn Alimentos ZEA, Lab Engn Separacoes LES, BR-13635900 Pirassununga, SP - Brazil

^[2] Univ Estadual Campinas UNICAMP, Fac Engn Alimentos FEA, Dept Engn Alimentos DEA, Lab Extracao Termodinam Aplicada & Equilibrio ExT, BR-13083862 Campinas, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF CHEMICAL THERMODYNAMICS; v. 156, MAY 2021.
• Web of Science Citations: 0

Abstract

Apart from advantages regarding safety, short-chain alcohols used as substitutes for hexane in vegetable oil extraction can be partially recovered from the extract only by cooling due to their partial miscibility with oil. Therefore, the circumstances under which this separation is possible were studied from the determination of liquid-liquid equilibrium data of systems containing crude sesame seed oil and short-chain alcohols (crude sesame seed oil + ethanol + water, and crude sesame seed oil + isopropanol + water) with different hydration levels, in temperatures from (283.2 +/- 0.1) to (333.2 +/- 0.1) K. Adjusted NRTL model temperature-dependent parameters adequately described the phase compositions, with low global deviation values (0.24-0.63%). Results of the predicted alcohol amount that could be separated from extracts revealed that azeotropic ethanol is the most advantageous since approximately 100% of recovering was reached for temperatures between 283.2 and 288.2 K and for extracts with oil contents of up to 0.20 in mass. In addition to high recoveries, systems containing azeotropic ethanol showed the lowest amounts of residual alcohol to be evaporated from the oil-rich phases (approximately 8%). Finally, partition coefficients for free fatty acids close to or higher than 1 indicating greater migration of these components to the alcohol-rich phase, which corresponds to the possibility that the partial desolventization and deacidification processes are performed simultaneously. (C) 2021 Elsevier Ltd. (AU)

• FAPESP's process: 18/13207-6 - Extraction and computational simulation of ethanolic biodiesel production from peanut oil
• Grantee: Daniel Gonçalves
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/12713-5 - Effects of soybean pre-treatment on the performance of the alcoholic extraction process: yield, functionalities of the protein fraction and volatile fraction characterization
• Grantee: Maria Carolina Capellini
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 14/21252-0 - Equilibrium and production processes of biofuels and bioproducts
• Grantee: Antonio José de Almeida Meirelles
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/13339-6 - Technical feasibility of using alcoholic solvents in vegetable oil extraction: Physical-chemical characterization of oil, functional properties of protein fraction and solvent recovery
• Grantee: Maria Carolina Capellini
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 14/09446-4 - Development of a process of vegetable oil extraction using alcoholic solvents: evaluation of oil composition and changes in the protein fraction
• Grantee: Christianne Elisabete da Costa Rodrigues
• Support Opportunities: Regular Research Grants