Comparison and Dynamic Models of Supercritical CO2 Extraction Enhanced by Different Technologies
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Abstract:
In order to extend the scope and improve the efficiency of supercritical CO2 extraction, four enhanced technologies including supercritical CO2 extraction with modifier (SCE), supercritical CO2 extraction with ultrasound combined modifier(USCE), supercritical CO2 reverse microemulsion extraction (SCRME) and supercritical CO2 reverse microemulsion extraction with ultrasound(USCRME) were applied to extract ginsenosides from ginseng. Their extracting kinetic models were built based on transfer theory and principle of mass balance. The results showed that the extraction yields of ginsensides by SCE, USCE, SCRME and USCRME were 0.26%, 0.45%, 0.76% and 1.15%, respectively. The extraction rates of ginsensides by four methods showed similar order to the extraction yield. The fitting degree of the model and the experimental data was more than 99.5%. The maximum E∞ (1.213%) and k (0.659) values were obtained by USCRME model simulation, which were 3.95 and 1.32 times, respectively, of those by SCE. The results demonstrated that supercritical CO2 extraction enhanced by ultransound combined with reverse microemulsion could improve the extraction yield and rate of polar material ginsensides.
