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

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 evalua...

Full description

Saved in:
Bibliographic Details
Published in:Química Nova 2008, Vol.31 (6), p.1319-1323
Main Authors: Azevedo, Álvaro Bandeira Antunes de, Kieckbusch, Theo Guenter, Tashima, Alexandre Keiji, Mohamed, Rahoma Sadeg, Mazzafera, Paulo, Melo, Silvio Alexandre Beisl Vieira de
Format: Article
Language:English
Subjects:
caffeine solubility
CHEMISTRY, MULTIDISCIPLINARY
coffee oil
supercritical carbon dioxide
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0100-4042
1678-7064
0100-4042
1678-7064
DOI:10.1590/S0100-40422008000600009