Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/202468
Type: Artigo de periódico
Title: Supercritical CO2 recovery of caffeine from green coffee oil: new experimental solubility data and modeling
Author: Azevedo, Álvaro Bandeira Antunes de
Kieckbusch, Theo Guenter
Tashima, Alexandre Keiji
Mohamed, Rahoma Sadeg
Mazzafera, Paulo
Melo, Silvio Alexandre Beisl Vieira de
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.
Subject: caffeine solubility
coffee oil
supercritical carbon dioxide
Editor: Sociedade Brasileira de Química
Citation: Química Nova. Sociedade Brasileira de Química, v. 31, n. 6, p. 1319-1323, 2008.
Rights: aberto
Identifier DOI: 10.1590/S0100-40422008000600009
Address: http://dx.doi.org/10.1590/S0100-40422008000600009
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422008000600009
Date Issue: 1-Jan-2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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