Supercritical CO2 extraction of oil from green coffee beans: Solubility, triacylglycerol composition, thermophysical properties and thermodynamic modelling

Autor(es)

Comelio-Santiago, Heber P. ; Goncalves, Cintia Bernardo ; de Oliveira, Naila Albertina ; de Oliveira, Alessandra Lopes

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF SUPERCRITICAL FLUIDS; v. 128, p. 386-394, OCT 2017.
• Citações Web of Science: 10

Resumo

The aim of this study was to measure the experimental solubility of green coffee oil (GCO) in supercritical CO2 (scCO(2)). Solubility was measured by static method under temperatures from 313.15 to 353.15 K and pressures of 30 and 35 MPa. The fatty acid (FA) profile was determined by gas chromatography-mass spectrometry (GC/MS). From these results, the triacylglycerol (TAG) profile was estimated by statistical methodology based on the FA composition. The thermophysical properties of the TAGs were estimated by group contribution methods The experimentally calculated equilibrium data were correlated using the Peng-Robinson equation of state (PR-EoS) with the van der Waals mixing rule. The experimentally measured solubility ranged from 12.4 to 26 g oil/kg CO2. The results showed that solubility increased with increasing temperature under isobaric conditions. However, the effect of temperature showed different behavior at 343.15 and 353.15 K, depending on the pressures. (AU)

• Processo FAPESP: 10/16665-3 - Extração de óleo de grãos de café verdes por fluido supercrítico, fluido pressurizado e comparação de sua composição com o óleo de café obtido por prensagem dos grãos pelos pequenos produtores do estado de São Paulo - análise da concentração de diterpenos
• Beneficiário: Alessandra Lopes de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular