Fresh rice bran is not easy to store and is prone to rancidity and oxidation, which is the main reason for the low utilization rate of rice bran in the past. The rancidity of rice bran is due to the decomposition and oxidation of lipid substances in rice bran by lipase and oxidase in rice bran. In recent years, although people have inactivated enzyme substances such as lipase in rice bran through high temperature, high pressure, and high shear extrusion, extending the shelf life of rice bran, the acid value of crude rice bran oil extracted is still relatively high.
Therefore, refining and deacidification is an important part of rice bran oil processing plant. At present, the commonly used oil deacidification processes are chemical alkali refining and deacidification and physical steam distillation deacidification. Among them, alkali refining and deacidification are more commonly used. However, for rice bran oil, although alkali refining and deacidification can reduce the acid value of oil within a reasonable range, under this process, oryzanol will generate sodium salt when it meets alkali and be adsorbed by alkaline soap stock, resulting in oryzanol loss of up to 60%.
Oryzanol is an important by-product in the deep processing of rice bran and rice bran oil. The oryzanol content in crude rice bran oil can reach more than 20 mg/g, which is an ideal raw material oil for extracting oryzanol. After continuous exploration by relevant practitioners, it was found that when refining rice bran oil, the rice bran oil mill can choose to treat it with two processes: alkali refining deacidification and distillation deacidification. This can not only take into account the deacidification rate and refining rate, but also avoid serious loss of oryzanol as much as possible. In addition, some rice bran oil plants will adopt the adsorption deacidification process, using the adsorbent to adsorb free fatty acids to achieve the deacidification effect. The operation is simple, the cost is low, and there is no wastewater discharge.
In actual operation, the deacidification scheme adopted by the rice bran oil mill still needs to be decided according to its actual situation. When producing rice bran oil, the oil mill still needs to cooperate with a strong and experienced machinery and equipment factory in order to achieve a good oil production effect. Henan Huatai Cereals and Oils Machinery Co., Ltd. has a history of more than 37+ years of grain and oil equipment production and processing, and its cooperative customers are spread across many regions at home and abroad. It is a powerful manufacturer recognized by many friends. Huatai Oil Machinery is a good choice for choosing rice bran oil refining and processing equipment.
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