Evaluation of Techniques for Intensifying the Process of the Alcoholic Extraction of Coffee Ground Oil Using Ultrasound and a Pressurized Solvent

Author(s)

Toda, Tatiane Akemi ; Santana, Ana Julia Morelli ; Ferreira, Julieta Adriana ; de Jesus Agnolon Pallone, Eliria Maria ; de Aguiar, Claudio Lima ; da Costa Rodrigues, Christianne Elisabete

• Document type: Journal article
• Source: FOODS; v. 11, n. 4, p. 20-pg., 2022-02-01.

Abstract

Ultrasound-assisted extraction (UAE) and pressurized liquid extraction (PLE) techniques were evaluated and compared with conventional extraction for obtaining spent coffee ground oil (SCGO). The use of absolute ethanol (ETO) and hydrated ethanol (ET6) as solvents, two levels of SCG mass ratio:solvent, 1:4 (U4) and 1:15 (U15), and ultrasound powers of 0, 200, 400, and 600 W were tested. ET0 and U15 resulted in higher extraction yields of SCGO (Y-SCGO, 82%). A positive effect of sonication on YscGo was observed only for condition U4. UAE resulted in defatted solids (DS) with higher apparent density values, corroborating the increase in the amount of smaller diameter particles due to sonication. The micrographs showed changes in the surfaces of the solids from the UAE and PLE, although the crystalline structures of the DS were not altered. UAE and PLE, compared to conventional extraction, did not allow significant gains in terms of Y-SCGO and, consequently, in the number of contact stages in an extractor configured in cross-currents. (AU)

• 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: 17/20840-4 - Valorization of agroindustrial coproducts through obtaining vegetable oils and minority compounds by extraction with solvents
• Grantee: Christianne Elisabete da Costa Rodrigues
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/10034-0 - Spent coffee grounds oil extraction using ethanol: Kinetics extraction, equilibrium data and process intensification
• Grantee: Tatiane Akemi Toda
• Support Opportunities: Scholarships in Brazil - Doctorate