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t. mext mCO2 Cf (z L,t)dt (12) 0 3.1 Influence of Drying Treatment Figure 3 illustrates the yield (expressed as the ratio of the mass of oilresin extracted to the mass of oilresin in the rhizomes versus the ratio of the amount of CO2 to the mass of extracted oilresin) of the supercritical CO2 extraction of oilresin from the rhizomes of turmeric submitted to a drying previous treatment at pressures between 25 and 30 MPa and temperature of 318 K. The results show that the drying previous treatment has a great influence on the extraction yield. The rhizomes of turmeric submitted to a drying previous treatment at 343 K lead to higher yields for extraction experiments carried out maintaining the system pressure constant. This may be due to the fact that a drying treatment of the rhizomes of turmeric at 378 K for 24 hours causes a higher volatilization of the oilresin as well as a contraction of pores in the solid matrix (higher mass transfer resistence), and hence, affecting the extraction yield. It could also be observed that supercritical CO2 extraction of the oiresin from the rhizomes of turmeric submitted to a drying treatment, carried out at pressures carried out at 25 and 30 MPa, lead to similar extraction yields. This observation emphasizes the fact that volatilization of the oilresin take place during the drying treatment at 378 K. 1,0 0,9 0,8 0,7 0,6 0,5 0,4 0,3 0,2 0,1 0,0 Figure 3. Yield of the supercritical CO2 extraction of oilresin from the rhizomes of turmeric. 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 WCO2 [gCO2/gOil] T = 318 K, P = 30 MPa TDrying = 343 K T = 318 K, P = 30 MPa TDrying = 378 K T = 318 K, P = 25 MPa TDrying = 343 K T = 318 K, P = 25 MPa TDrying = 378 K Oil [-]PDF Image | SUPERCRITICAL CO2 EXTRACTION OF CURCUMINS
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