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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.)

Supercritical CO2 recovery of caffeine from green coffee oil: new experimental solubility data and modeling

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Author(s):
Antunes de Azevedo, Alvaro Bandeira [1] ; Kieckbusch, Theo Guenter [1] ; Tashima, Alexandre Keiji [1] ; Mohamed, Rahoma Sadeg [1] ; Mazzafera, Paulo [2] ; Beisl Vieira de Melo, Silvio Alexandre [3]
Total Authors: 6
Affiliation:
[1] Univ Estadual Campinas, Fac Engn Quim, BR-13083970 Campinas, SP - Brazil
[2] Univ Estadual Campinas, Inst Biol, BR-13083970 Campinas, SP - Brazil
[3] Univ Fed Bahia, Escola Politecn Engn, Dept Engn Quim, BR-40210630 Salvador, BA - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Química Nova; v. 31, n. 6, p. 1319-1323, 2008.
Web of Science Citations: 14
Abstract

The caffeine solubility in supercritical CO2 was studied by assessing the effects of pressure and temperature on the extraction of green coffee oil (GCO). The Peng-Robinson¹ equation of state was used to correlate the solubility of caffeine with a thermodynamic model and two mixing rules were evaluated: the classical mixing rule of van der Waals with two adjustable parameters (PR-VDW) and a density dependent one, proposed by Mohamed and Holder² with two (PR-MH, two parameters adjusted to the attractive term) and three (PR-MH3 two parameters adjusted to the attractive and one to the repulsive term) adjustable parameters. The best results were obtained with the mixing rule of Mohamed and Holder² with three parameters. (AU)