To refine crude rice bran oil, you need to follow a series of steps to remove the impurities and improve the quality of the oil. Here is a brief overview of the rice bran oil refining process:
1. Degumming: This is the first step to remove the gelatinous substances such as phospholipids and proteins in the crude oil. Degumming can be done by adding water, acid, or enzymes to the oil and then separating the gums by centrifugation or filtration.
2. Deacidification: This is the second step to neutralize the free fatty acids in the oil and reduce the acid value. Deacidification can be done by adding alkali, such as sodium hydroxide, to the oil and then separating the soapstock by centrifugation or filtration.
3. Decolorizing: This is the third step to remove the pigments and other impurities that affect the color and appearance of the oil. Decolorizing can be done by adding bleaching agents, such as activated clay or carbon, to the oil and then filtering out the adsorbed impurities.
4. Deodorizing: This is the fourth step to remove the unpleasant odors and flavors in the oil. Deodorizing can be done by heating the oil under vacuum and injecting steam or inert gas to strip off the volatile compounds.
5. Dewaxing: This is an optional step to remove the waxes and other high-melting-point substances that may cause cloudiness or turbidity in the oil. Dewaxing can be done by cooling the oil and then filtering out the solidified waxes.
If you want to learn more about rice bran oil refining process, you can watch some videos, or you can also consult our Huatai Oil Machinery website: https://ricebranoilpress.com/