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Table 3: Comparison of the chemical composition of the essential oil from turmeric oilresin obtained by supercritical CO2 extraction using ethanol as co-solvent for the experiment carried out at 25 MPa and 313 K with those obtained by solvent extraction. Compounds Mierceno -Terpineno Limoneno -Terpineno p-Cimoneno 8-p-Cimenol Timol -cis-Bergatomeno -Humuleno ar-Curcumeno -Bisaboleno -Germaceno ar-Turmerona (E)--Atlantona (E)--Atlantona Retention Indices 989 1017 1029 1060 1088 1184 1292 1413 1457 1485 1510 1556 1670 1706 1778 Composition [wt.%] 0.2 0.1 0.4 0.2 0.04 0.2 0.2 0.1 0.6 3.6 1.7 0.2 15.5 Viasan et al. (1989) Mondon et al. (1986) - - - - - - - - - 1.42 – 4.80 0.29 – 2.20 - -Pineno 937 0.1 0.03 – 0.1 - - - - - - - - - - 2.6 – - - 6.5 -Felandreno 1005 4.1 - - p-Cimeno 1024 1.5 - - 1,8-Cineole 1032 4.0 0.07 – 0.13 0.13 – 1.14 Terpinoleno 1087 1.3 - 0.10 – 4.16 4-Terpinol 1180 0.2 - - -Terpineol 1191 0.4 - - Carvacrol 1300 0.03 - - Cariofileno 1420 0.9 - 0.15 – 4.5 -Curcumeno 1481 0.2 - - -Zingibereno 1497 6.4 3.2 – 6.0 0.85 – 14.07 -Sesquifelandreno 1523 7.7 - 1.47 – 13.34 ar-Turmerol 1581 1.5 - - 7.68 – 20.30 15.6 - - 7.71 – 30.71 (Z)--Atlantona 1688 20.3 - - 6S-7R-Bisaboleno 1743 0.3 - - 0.6 - - 3.3 Mathematical Modeling The mathematical model (expressed as mass of oilresin extracted versus time) applied to describe the mass transfer kinetics of the supercritical CO2 extraction process is shown in Figure 7. Since the physical characteristics of the fixed, the physical properties of the solvent and the operating conditions are known the only remaining parameter to be regressed is the first order desorption constant (K). It could be observed that the proposed mass transfer model showed good agreement with experimental data. Table 4 shows the linear first order constant and thePDF Image | SUPERCRITICAL CO2 EXTRACTION OF CURCUMINS
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