METHOD FOR EXTRACTING VITAMIN E FROM COTTONSEED OIL

摘要

Disclosed is a method for extracting vitamin E from cottonseed oil. The method comprises adding absolute ethanol and anhydrous sodium sulphate into cottonseed oil , and boiling; pouring the boiled cottonseed oil into a separating funnel, sealing and standing; adding NaOH and ascorbic acid into the separated ethanol phase, and introducing nitrogen; adding pure water and n-hexane into saponified solution, pouring the mixed solution into the separating funnel after fully and uniformly mixing, sealing and standing, so as to obtain a n-hexane phase containing vitamin E; removing water soluble impurities; freezing the water-washed n-hexane phase at the temperature of -10℃, and finally separating out precipitate formed at the low temperature; placing the obtained n-hexane phase into a rotary evaporator, reducing pressure to vacuum pressure ranging from 2 to 3 mmHg, distilling out water vapor, thereby obtaining a concentrated solution, namely the target product vitamin E. The present invention has the advantages of mild reaction, less side reaction, low equipment investment, less product pollution, separation of a catalyst and product, simple product treatment, fewer reaction steps and low reaction cost, the vitamin E can be extracted well, and extraction efficiency of the vitamin E is high.