The rice bran oil extraction process has the advantages of large processing capacity, high efficiency and high oil yield. Rice bran has low oil content and high powder content. The traditional pressing method for oil production is not ideal and is easy to cause blockage of mechanical equipment. Therefore, the rice bran oil processing plant in industrial production is mainly based on the extraction process. The rice bran oil extraction process is to use organic solvents to dissolve oils and fats to form mixed oils, and then separate and recover solvents through a series of evaporation, stripping, condensation and other treatments to obtain the extraction of crude oil. The extraction process is recognized in the industry as a high-efficiency and high-oil-yield oil processing process. It has been developed in my country for more than half a century. At present, more than 80% of edible oils in my country are processed by this process.
Rice bran contains a variety of endogenous enzymes, which will accelerate the hydrolysis and oxidation of fats under suitable conditions, leading to rancidity and affecting subsequent processing. Therefore, it is necessary to pretreat it to ensure the quality of raw materials and avoid affecting production quality.
The advantage of the rice bran expansion process in production is that it can transform rice bran with high powder content and easy to rancidity into a porous and permeable columnar structure through the extruder machine, which can increase the contact area between oil and solvent during the rice bran oil solvent extraction process, so that the solvent can evenly and quickly penetrate into the rice bran, improving the extraction efficiency and oil yield of oil. During the rice bran expansion process, it can inactivate lipase, eliminate some microorganisms, greatly reduce the risk of oil rancidity, extend the shelf life of rice bran oil, ensure the freshness and quality of the oil, and improve the subsequent refining effect and oil yield.
The expansion-extraction process is a commonly used process for producing rice bran oil. It is simple to operate and has a high degree of mechanization. It can form large-scale production and reduce labor intensity. Rice bran contacts with the solvent through the rice bran oil exttraction machine to form a mixed oil, and then the cake and mixed oil are desolventized by the stripping tower, degassing machine, etc., which can improve the oil yield and cake quality. Solvent recovery and reuse can also reduce production costs.
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