| 摘要 |
PROBLEM TO BE SOLVED: To provide a process for purifying highly unsaturated fatty acid- containing oils and fats which may efficiently reduce free fatty acids, aldehyde- containing carbonyl compounds, pigment components and odor components of the highly unsaturated fatty acid-containing oils and fats. SOLUTION: When obtaining highly unsaturated fatty acid-containing oils and fats with reduced levels of free acids, free fatty acids, aldehyde-containing carbonyl compounds, pigment components and odor components, carbon dioxide in a supercritical state is brought into contact with the raw material oils and fats inside an extraction tank or an extraction tower to separate free fatty acids, aldehyde-containing carbonyl compounds, pigment components and odor components as fractions or residues from the highly unsaturated fatty acid- containing oils and fats.
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