Due to the low oil content of rice bran, we choose the solvent extraction method to extract the rice bran oil mostly. Rice bran oil is high nutritional value and more and more popular among the people, but the oil content of rice bran only 15-18%, it's lower than sunflower seed, corn germ, peanut, and so on. If by pressing method, it will waste 6-7% oil at least, so the best way of extracting rice bran oil is solvent extraction method.
Rice bran and its oil content
The residual oil ratio of solvent extraction method is less than 1%, so to get more oil from oil seeds, most oil seeds with low oil content less than 20% use the solvent extraction plant. Such as, for the rice bran of 18% oil content you can get 17% rice bran oil, but if you extract the oil by pressing method, you can only get about 10% rice bran oil. The solvent extraction method will let you get more 5-6% oil than pressing method.
But because of the special structure of the rice bran, it must be puffed before solvent extraction. The function of it is breaking the structure of the rice bran and extend the contact area of solvent, which will be easier to extract the rice bran oil.
Machines used to process rice bran before solvent extraction
Rice bran processing steps by oil solvent extraction method: cleaning - separating - puffing - drying - solvent extraction.
Every step has its fanction. Cleaning is remove the impurities and metal mixed in the rice bran. Separating is separate the rice bran from the small broken rice by bran and tips separator machine. Puffing is breaking the structure of rice bran and make it bigger of the superficial area. Drying is adjust the moisture of the rice bran to reach the best conditions for solvent extraction. And solvent extraction is using the solvent to extract the oil from rice bran.
After these processing you can get the crude rice bran oil, but which need to be refined by rice bran oil refinery plant. Henan Doing Company can provide you rice bran oil processing machine and refinery machine with the input capacity of 30-1000 tons per day. Welcome to contact us, and our engineers can design for you.