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

Química Nova

Universidade Federal da Bahia, Salvador, Brasil¹  Mazzafera, Paulo¹  Tashima, Alexandre Keiji¹  Melo, Silvio Alexandre Beisl Vieira de¹  Universidade Estadual de Campinas, Campinas, Brasil¹  Azevedo, Álvaro Bandeira Antunes de¹  Kieckbusch, Theo Guenter¹  Mohamed, Rahoma Sadeg¹ 

关键词: caffeine solubility;    coffee oil;    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 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.

【 授权许可】

Unknown