Solubility of caffeic acid in CO2 + ethanol: Experimental and predicted data using Cubic Plus Association Equation of State
authors Bitencourt, RG; Palma, AM; Coutinho, JAP; Cabral, FA; Meirelles, AJA
nationality International
journal JOURNAL OF SUPERCRITICAL FLUIDS
author keywords 3,4-Dihydroxycinnamic acid; Supercritical carbon dioxide; Cosolvent; Phase equilibrium; Thermodynamic modeling; Soave-Redlich-Kwong
keywords SUPERCRITICAL CARBON-DIOXIDE; EQUATION-OF-STATE; PHENOLIC-COMPOUNDS; PLUS ETHANOL; ASSOCIATING SYSTEMS; PHASE-EQUILIBRIA; VAPOR-PRESSURE; FERULIC ACID; WATER; COSOLVENT
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.
publisher ELSEVIER SCIENCE BV
issn 0896-8446
year published 2018
volume 138
beginning page 238
ending page 246
digital object identifier (doi) 10.1016/j.supflu.2018.04.008
web of science category Chemistry, Physical; Engineering, Chemical
subject category Chemistry; Engineering
unique article identifier WOS:000435049200028
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journal impact factor 3.122
5 year journal impact factor 3.001
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