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NEWS
What Is Grease Dewaxing?
Time:Mon-11-21 hits:
Grease dewaxing is a process in which the high melting point wax and high melting point solid fat in the oil are separated out by cooling and crystallization, and then filtered or centrifuged to remove them.
Generally speaking, grease dewaxing actually has two meanings:
1. Remove waxes containing high melting points including rice bran oil, sunflower oil, corn oil, safflower seed oil, wheat germ oil, etc. These waxes are essentially wax fats composed of C20-C28 higher fatty acids and C22-C30 higher fatty alcohols .
2. Remove all solid components that produce turbidity in the oil during storage. These solid components include wax components, oil polymers, saturated triglycerides and other components.
Strictly speaking, the former should be called dewaxing, and the latter should be called winterization. These are two different concepts, and the two should not be confused.
Wax mostly exists in the seed coat and germ of vegetable oil, and the content of wax varies with different vegetable oils and different processing methods.
Generally, when the wax content of sunflower oil, safflower oil, corn oil, rapeseed oil, etc. is low, the oil is generally cooled to about 7-14°C, and then the precipitated crystals are filtered with a filter press. When filtering wax, there are often traces of viscous substances, oil-soluble gums, soapstock components, etc. in the grease that adhere to the wax crystals. These substances often cause clogging of the filter cloth and bring obvious difficulties to the filtration operation.
Whether the dewaxing is successful or not, how to filter to make the crystals easy to precipitate, and how to improve the filtration efficiency is related to the difficulty of all filtration operations.
In order to reduce the precipitation of such impurities and non-crystalline substances, try to avoid difficult filtration operations. As the oil that needs to be dewaxed, it is usually not crude oil, and it is best to semi-refined oil after deacidification and decolorization.
For dewaxing target oils with different impurities, moisture, fatty acid content, and wax content, different dewaxing processes can be selected to ensure the quality of the final product oil.
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