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Ming-Chi Wei,Show-Jen Hong,Yu-Chiao Yang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.48 No.-
The present study investigated a green ultrasound-assisted supercritical carbon dioxide (USC–CO2)process for extracting oleanolic acid (OA) and ursolic acid (UA) from Hedyotis corymbosa. Chrastil, Bartleand Kumar and Johnston models were used to correlate the experimentalfictitious solubility data. Theoverall average absolute relative deviation (AARD (%)) in solid solubility ranged from 3.632% to 6.529%,which indicates good agreement between the experimentalfictitious solubility data and the modeledresults. Using the correlation results, the total heat of solution and the enthalpies of vaporization andsolvation for OA and UA in the USC–CO2 extraction process were also estimated.