| Summary: | 碩士 === 中國文化大學 === 化學工程與材料工程學系奈米材料碩士班 === 108 === In this study, we used supercritical carbon dioxide fluid equipment to extract essential oils from turmeric, and discussed the effects of temperature, pressure and flow on the yield of essential oils. In the experimental planning, the central composite design (CCD) is used to perform the regression of the second-order reaction surface model. Since the CCD takes into account the pivot point, there are five conditions for the experimental factors. In this design, there are six pivot points, eight corner points, and an experiment of repeating six central points. There are total of 20 sets of results in our experience. During the course of the experiment, the temperature conditions are 31.6℃, 35℃, 40℃, 45℃, 48.4℃, pressure conditions are 2960 psi, 3200 psi, 3600 psi, 4000 psi, 4240 psi, flow conditions are 45 L/hr, 60 L/hr, 80 L/hr, 100 L/hr, 114 L/hr. However, using the weight percentage, the yield of the turmeric essential oil of each experimental group was calculated separately, followed by the variation number and the second-order regression analysis. Through the MATLAB software, the reaction surface map is drawn, and the interaction between the two condition factors and the effect on the yield are discussed, and the optimal extraction conditions are analyzed.
The experimental data showed a maximum yield of 1.46% at a pressure of 4240 psi, a temperature of 40 ° C, and an 80 L/hr condition. After regression analysis of the resulting data by a second-order model, the optimal yield was 1.86%. The experimental conditions were pressure 4240 psi, temperature 48.4 ° C, flow rate 114 L / hr. Finally, the crude fat percentage of turmeric essential oil obtained by the soxhlet extraction method is consistent with the yield of essential oil by supercritical fluid extraction method, and analyzed by Fourier infrared spectrometer, the essential oil components extracted by the two methods are consistent.
Keyword：Supercritical Carbon Dioxide, Turmeric, Soxhlet Extraction, Fourier-transform infrared spectroscopy , FTIR
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