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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Solubility of caffeic acid in CO2 + ethanol: Experimental and predicted data using Cubic Plus Association Equation of State

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Author(s):
Bitencourt, Raphaela G. [1] ; Palma, Andre M. [2] ; Coutinho, Joao A. P. [2] ; Cabral, Fernando A. [1] ; Meirelles, Antonio J. A. [1]
Total Authors: 5
Affiliation:
[1] Univ Estadual Campinas, Sch Food Engn, Lab Extract Appl Thermodynam & Equilibrium, BR-13083862 Campinas, SP - Brazil
[2] Univ Aveiro, Chem Dept, CICECO, Campus Santiago, P-3810193 Aveiro - Portugal
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF SUPERCRITICAL FLUIDS; v. 138, p. 238-246, AUG 2018.
Web of Science Citations: 4
Abstract

This work evaluated the solubility of caffeic acid (CA) in mixtures of supercritical carbon dioxide (scCO(2)) and ethanol at different temperatures (313, 323 and 333 K), pressures (20, 30 and 40 MPa) and concentrations of ethanol (2.2, 5.4 and 10.2 mol%). The Soave-Redlich-Kwong and Cubic Plus Association (CPA) equations of state were used to correlate the binary mixture data and to predict the ternary system data. CA solubility in ethanol is approximately 106 times higher than its solubility in pure scCO(2). By using 10.2 mol% ethanol in scCO(2), CA solubility increased 30,000 times at 313 K and 20 MPa. Both models provided reasonable descriptions of the experimental data for the binary systems. However, CPA-EoS can better describe the strong interactions between acid molecules and ethanol, and can predict that the addition of small amounts of ethanol to scCO(2) provides a large increase in CA solubility. (AU)

FAPESP's process: 10/16665-3 - Green coffee oil extraction by supercritical and pressurized fluid process, and comparison with the composition of coffee oil obtained by pressing for the small producers of the State of São Paulo - concentration analysis of bioactive diterpenes
Grantee:Alessandra Lopes de Oliveira
Support Opportunities: Regular Research Grants
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