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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Química Nova; v. 31, n. 6, p. 1319-1323, 2008.
• Citações Web of Science: 14

Resumo

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)

• Processo FAPESP: 02/07753-0 - Extracao e recuperacao de principios ativos de produtos naturais utilizando fluidos supercriticos.
• Beneficiário: Paulo Mazzafera
• Modalidade de apoio: Auxílio à Pesquisa - Regular