Rice bran oil is produced through several manufacturing processes:
Rice Bran Preparation: The rice bran is prepared by removing the husk of the rice grain, resulting in the production of the brown rice grain. The bran and the rigid layers of the rice bran are then extracted.
Expelling: The well-prepared rice bran is put into the feeder of the expeller, where a screw worm transports the rice bran forward. As the screw worm moves, the space becomes smaller and smaller, thus squeezing rice bran oil out. The fresh rice bran oil seeps out through small openings in the bottom of the squeezing barrel where the rice bran oil cake cannot pass through, thus separating rice bran oil from oil cake.
Extraction: After collecting rice bran oil cake, rice bran oil extraction comes with the help of food-grade solvent, usually hexane. Rice bran oil extraction works on the principle of counter-current and moving bed with variable bed height and different speed mechanism to ensure excellent penetration and percolation of solvent for absolute extraction. Then distillation begins in a vacuum, and the extracted rice bran oil is collected by vaporizing solvent out for later recovery.
Refining: The rice bran oil is then pumped into refining machinery to produce different grades of rice bran oil. The rice bran oil refining process usually includes filtering, neutralization, degumming, decolorization, deodorization, and dewaxing.
After all these manufacturing processes, fresh rice bran oil would be ready.