Direct Extraction of Rice Bran Oil with Lower Acid Value from Rice Bran

Authors investigated a direct extraction method of rice bran oil having low acid value. The proposed process comprises two stages in which methanol is used in the first stage and hexane or benzene in the second stage as the effective solvents.Under optimum conditions for the content of water in methanol, volume of methanol, extraction rate and for the extraction temperature, rice bran oil having lower acid value (about 3) was obtained with higher yield than that of the usual method (alkali-refining from crude rice oil of higher acid value). Another interesting feature of this method is the fact that feruric acid ester was almost transfered into the ricebranoil of lower acid value, therefor, the feruric acid ester will be able to recover easily from the rice bran oil.