超臨界流体を利用した抽出分離の基礎研究--α-トコフェロ-ル,パルミチン酸およびトリパルミチンの高密度2酸化炭素への溶解度

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The solubility of α-tocopherol (vitamin E) in compressed carbon dioxide was measured by use of a flow method at 25°C and 40°C to examine the possibility ofα-tocopherol extraction from crude palm oil with compressed carbon dioxide.<BR>In addition, solubility measurement was performed at these temperatures for palmitic acid and tripalmitin as representatives of free fatty acids and triglycerides in palm oil, respectively.<BR>The Soave-Redlich-Kwong equation of state was applied to correlate the solid-fluid and fluid-fluid equilibria obtained in this experiment with a two-parameter mixing rule.<BR>A temperature-change method was found to be effective for α-tocopherol extraction from the experimental data. By use of the characteristic phenomenon that the solubility of palmitic acid is suddenly decreased with a small increase of temperature from subcritical to supercritical states, α-tocopherol can be concentrated at a mild pressure condition.
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