Physical refining technology of rice bran oil
1. Hydration degumming
In Physical refining of rice bran oil it is important to remove the colloid substances in the oil, as much as possible of colloidal substance can affect not only the quality of the products, and under the action of high temperature easy coking are attached to the packing surface to form oil dirties, affect the normal operation of equipment. In general, hydration degumming oil must be 30 mg/kg or less phosphorus content.
Will first hair oil to heat up to 80-85 ℃, add oil, concentration of 85% 0.3% of the amount of phosphoric acid, rapid mixing 30 min. Add the temperature is 90-95 ℃, 8% of the oil, the concentration of 5% salt solution slowly stir precipitation let stand for 2 h after 15 min, release oil foot.
First will be degummed oil to heat up to 75-78 ℃, temperature is 90-95 ℃, 8% of the oil solution, concentration of 5% alum slowly stir precipitation let stand for 2 h after 15 min, release oil foot. Then the oil temperature rise to 75-78 ℃, the temperature is 90-95 ℃, 8% of the oil in the water slowly stir 15 min after precipitation let stand for 2 h, release oil foot. Set aside.
Dry before the degumming hydration degumming oil moisture must be below 0.5%.Hydration degumming oil drying is done in continuous packing desolventizing dehydrator, vacuum drying is 0.09 Mpa, the oil temperature 105-110 ℃.
Dry oil heated to 85 ℃, by quantitative pump to join a concentration of 85% for the amount of consumption of phosphoric acid, 0.1% of the heavy oil, the knife mixer quickly after mixing with mixed reaction, into the leaf filter. Making use of waste clay after decolorizing filtration to remove residual phospholipids and metal ion impurities such as dry degummed oil. Generally, the dry process of 10 mg/kg or less phosphorus content of degummed oil.
70% of the dry degummed oil heated to 110 ℃, enter the bleaching tower...