Rice bran oil manufacturing process mainly include rice bran oil expelling, extraction and refining. Rice bran oil expelling relies on high quality rice bran oil expellers. After the well prepared rice bran is put into the feeder of the expeller, a screw worm will transport the rice bran advance. The pressing screw will push forward rice bran oil out of the squeezing chamber by pressing it. The two main types of commercial rice bran oil extraction methods are solvent extraction and mechanical pressing.
The extraction process starts with raw material preparation, rice bran is first screened. It is then heated by steam at temperature higher than 100 degrees Celsius to stop Lipase hydrolysis in rice bran prior to extraction. Rice bran oil is extracted from rice bran by solvent extraction using food grade n-hexane as solvent. The solvent is evaporated from the rice bran oil to make it edible.