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

Quimica nova

Mazzafera, Paulo¹  Tashima, Alexandre Keiji¹  Azevedo, Álvaro Bandeira Antunes de¹  Kieckbusch, Theo Guenter¹  Mohamed, Rahoma Sadeg¹  Melo, Silvio Alexandre Beisl Vieira de² 

[1] Universidade Estadual de Campinas, Campinas, Brasil;Universidade Federal da Bahia, Salvador, Brasil

关键词: caffeine solubility;    coffeeoil;    supercritical carbon dioxide.;   

DOI  :  10.1590/S0100-40422008000600009

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

The caffeine solubility in supercritical CO2was studied by assessing the effects of pressure and temperature on the extractionof green coffee oil (GCO). The Peng-Robinson1 equation of state wasused to correlate the solubility of caffeine with a thermodynamic model andtwo mixing rules were evaluated: the classical mixing rule of van der Waalswith two adjustable parameters (PR-VDW) and a density dependent one, proposedby Mohamed and Holder2 with two (PR-MH, two parameters adjusted tothe attractive term) and three (PR-MH3 two parameters adjusted to the attractiveand one to the repulsive term) adjustable parameters. The best results wereobtained with the mixing rule of Mohamed and Holder2 with three parameters.

【 授权许可】

CC BY