Rice bran oil is a butritive vegetable oil and high in linoleic acid content, which can reduce cholesterol in human blood, and help to prevent CVD(cardiovascular disease). Following is a introduction about rice bran oil extraction process.
There are 2 rice bran oil extraction processes, pressing and solvent extraction. In general, pressing is used in small-scale rice bran oil extraction, while solvent extraction is always used in industrial rice bran oil extraction process. This article is mainly about pressing, small-scale rice bran oil extraction process.
1. Cleaning: In raw material - rice bran, there are many impurities such as broken rice, iron impurities, etc,which would decrease rice bran oil yeild.
2. Mix with shell: Add shells in rice bran to 4.5-5%, which will increase hardness of flakes and help steam get though evenly.
3. Steaming: This step is to soften the fiber, agglomerate the protein, broke cells and to gather droplets to bigger oil drop which is much easier to press out. In this section, steming temperature is 102-105℃，and adjust moisture from 11-12% to 32-37%.
4. Cooking: This step is to decrease moisture to 5-7% by 30min cooking at 115-120℃.
5. Pressing: Screw oil press is always used in this step, and temperatire should be 80-90℃.
However, pressing rice bran oil extraction process is only suitable in small-scale, and pressed rice bran oil is high in AV(acid value), and has much poisonous matters. Before commerical use, rice bran oil refinery is needed.
Rice bran oil extraction process
Rice bran oil refinery process
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