Rice bran oil extraction equipment is a kind of high-grade vegetable rice bran oil sold in the market after the raw materials are cleaned, screened, bran selenium separated, tempered, granulated and sent to the rice bran oil extraction equipment for oil extraction process. The following details of the rice bran plant oil extraction procedures.
1. Cleaning: This is the first step of oil processing. Vibration treatment screen is often used as cleaning tool. The cleaning equipment used in the oil preparation process is basically the same.
2. Separation of bran and selenium and screening of broken rice grains in the bran of banking office. The solvent can be fully contacted during solvent leaching.
3. Soften. The physical properties of rice bran are adjusted to be suitable for granulation or expansion.
4. Granulator extrudes particles with diameter of 3-6cm
5. Dry the rice bran particles to 5-7% water content, suitable for extracting oil.
Rice bran oil extraction equipment after the above processes, then extraction, evaporation, desolvation, solvent recovery. The crude oil of rice bran has been extracted from the oil, which is precipitated and sent to the refining equipment by the leaf filter for further refining and processing, and the cake is packaged as feed. The refining process of crude oil from rice bran oil extraction equipment mainly includes degumming, deacidification, decolorization, deodorization and dewaxing.
Next, the dewaxing process in the refining process of rice bran oil extraction equipment is introduced in detail.
Dewaxing is beneficial to remove impurities in the oil that are not conducive to decolorization, so our rice bran oil extraction equipment manufacturer will arrange the dewaxing process before decolorization. Due to the high content of fatty acids in the oil, the high melting point of fatty acids and the decrease of temperature, some fatty acids take the lead in solidifying, which leads to the sharp rise of viscosity of the oil. For the furfural oil with an acid value of 30 (KOH)/(mg/g), the temperature drops to 20. C has become very viscous, which makes dewaxing and filtration difficult. Therefore, the filtration temperature should not be lower than 20. C. The process we adopted is: the vacuum dehydrated bran oil is put into the crystallizing tank and cooled under slow stirring, so that the oil temperature is about 24 hours, from 70. C slowly and evenly down to 25. C. continue to mix slowly and keep the oil temperature unchanged, and carry out crystal nourishing for more than 48h. After crystal nourishing, use the blade filter to precoat the silicon bath soil for filtration. The oil quality should be kept at 25 during filtration. C remains unchanged. The increase of filter temperature can speed up the filtration efficiency and reduce the oil content of wax paste, but the wax content in the dewaxed oil will increase, the cloud point will increase, and the transparency will become worse; the decrease of filter temperature can reduce the wax content in the oil, reduce the cloud point, and improve the transparency, but it will significantly reduce the filtration oil rate and increase the oil content of wax paste. In practice, the dewaxing temperature of rice bran oil with acid value of 20-30 (KOH)/(mg/g) is controlled at 20-25. C. The comprehensive effect is good.
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