| Summary: | 碩士 === 國立中興大學 === 化學工程學系所 === 97 === This study examines effects of pressure, temperature and solvent to solid ratio (SSR) on extraction efficiencies of triglycerides from powdered Jatropha seeds and Crassna seeds by using supercritical carbon dioxide extraction. Designed supercritical conditions at pressures from 250 to 350 bar, temperatures from 313 to 333K and the SSR values from 65:1 to 125:1 were selected based on the response surface methodology to determine their affections on concentration of triglycerides in the extracted oil. A supercritical carbon dioxide extraction of Jatropha seeds at 340 bar, 330 K and the SSR value of 110:1 concentration of triglycerides 663.1mg/g of Jatropha oil, using 3300 g of carbon dioxide over 4 h. The extraction efficiency (i.e. recovery) of triglycerides attained 97.9%. A supercritical carbon dioxide extraction of Crassna seeds at 310 bar, 333 K and the SSR value of 100:1concentration of triglycerides 568.3mg/g of Crassna oil, using 3000 g of carbon dioxide over 3.5 h. Pressure effect presents more significant than that of the SSR value or that of temperature in increasing the extraction efficiency of triglycerides. The extraction efficiency (i.e. recovery) of triglycerides attained 96.8% from Crassna seed.
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