Rice bran is a by-product of rice processing. It is a mixture of the cortex, rice germ and broken rice that are milled off during the milling process of brown rice.
Expansion-extraction process is a common process for rice bran oil processing. The rice bran structure is changed by puffing the rice bran, and the contact surface and permeability are increased. The oil content of rice bran is not high. The rice bran oil extraction process can fully extract the oil in the rice bran and further increase the oil yield. The crude rice bran oil obtained by extraction is then removed by rice bran oil refining machine to obtain finished rice bran oil that meets the quality standards of edible oil.
The main problems in rice bran oil refining are: high acid value, deep color and difficult to remove, and serious loss of active substances. Conventional oil refining processes include hydration degumming, alkali refining and deacidification, adsorption decolorization, high temperature deodorization, and frozen dewaxing. Among them, the oryzanol loss in the alkali refining and deacidification stage is 89%; the vitamin E loss in the deodorization process is more serious, at 30%; the loss of phytosterols mainly occurs in the decolorization process, with a loss of 32%. In addition, the chemical oil refining process will also generate a large amount of wastewater, increase oil loss in production, and affect the environment and oil yield. Therefore, high acid value rice bran oil is more suitable for physical oil refining process.
The physical oil refining process uses distillation deacidification process, which utilizes the difference in relative volatility of free fatty acids (FFA) and triglycerides. Under high temperature and vacuum conditions, it uses direct steam to carry out stripping, and the vapor-liquid surface contacts. The water vapor is saturated with the volatilized FFA component and escapes according to the ratio of its partial pressure, thereby reducing the free fatty acid content in rice bran oil.
The use of physical refining technology to produce rice bran oil can reduce the generation of wastewater and the loss of neutral oil in production, have little impact on the environment, and can increase the oil yield of the rice bran oil plant, but the degumming of rice bran oil needs to be done well, and the physical refining process is not suitable for all varieties of edible oil.
Cooking oil refining process is one of the important processes in edible oil processing. Huatai Oil Machinery tailors production line solutions for customers according to the characteristics of different oils and the needs of oil plants, and provides reasonable processing technology, laying a good foundation for the smooth production of oil plants. The manufacturer has been engaged in the production and processing of oil equipment for many years, with rich domestic and overseas cooperation cases and good user reputation. You can visit the oil plant for an on-site visit.
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