Supercritical CO_2 extraction of Rhinzoma atractylodis Macrocephalae:experimental and modeling
Supercritical fluid CO2 extractions with(SFE-CO2) of Rhizoma atractylodis macrocephalae were carried out under a temperature of 40～60 ℃ and pressures of 35 MPa and 45 MPa.The profiles of extraction yield with time were thus obtained and the maximum extraction yield obtained was 6.07%.The temperature and pressure effects on the extraction yield were also investigated.The Crank,Naik and Barton models were used to describe the time dependence of the extraction yield,resulting in characteristic parameters for each model.The modeled results showed that the Crank model fitted very well against experimental data with an average absolute relative deviation of less than 4%.