During the extraction process, the solvent penetrates into the rice bran granules and combines with the oil, which diffuses from the rice bran granules into the solvent [ 7 ]. The oscillating extraction method can promote the diffusion of oil from the surface of the raw material into the solvent as quickly as possible to reach a uniform state.
How to extract crude oil from rice bran?
There are known several pretreatment methods for extracting crude oil from rice bran, such as for example a heat treating method involving heating and drying of the rice bran at a temperature above 80 oC or a cooking method where heating and drying are performed after adding steam or hot water to the material.
How is rice bran oil refined?
After the extraction, the crude rice bran oil is often refined in order to improve its quality and commercial value. The fundamental steps of the refining process include dewaxing, degumming, neutralization of the free fatty acids, bleaching, and steam deodorization.
How to improve the extraction ratio of rice bran oil?
Author to whom correspondence should be addressed. In order to improve the extraction ratio of rice bran oil, a single-factor experiment and response surface methodology with a central composite design were used to determine a new mixed solvent and the optimal extraction conditions of the mixed solvent.