METHOD FOR PREPARING ORYZANOL FROM ORYZANOL-CONTAINING SOAPSTOCK SERVING AS RAW MATERIAL

A method for preparing oryzanol from oryzanol-containing soapstock as a raw material includes the following steps: 1) alkali-alcohol thermal dissolution; 2) heat-preserved fine filtration; 3) heat-preserved ultrafiltration membrane separation; 4) heat-preserved decolorization; 5) acid neutralization and filtration; 6) washing; and 7) drying. The temperatures of the step 1) to the step 4) are controlled at 50-60° C. The method has a heat preservation operation at 50-60° C., membrane separation, decolorization and washing, to finally prepare a white powdered product. The purity of product oryzanol is greater than 98% and the yield is greater than 73%. The method does not use toxic or combustible or explosive organic solvents such as methanol, ether, hexane and solvent oil, so that the product use safety is improved; the production process is simple, has low requirements on production equipment, is easy to operate and realize, and is low in production cost and suitable for industrial production.