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The wax in vegetable oil generally exists in the seed coat and germ of the oil, and different oils and processing methods will make the wax content in the oil different. The freezing points of waxes are relatively high, between 38 and 90°C. These waxes will increase the cloud point of the oil, reduce the transparency and digestibility of the oil, and make the smell and palatability worse, thereby reducing the edible quality, nutritional value and industrial use value of the oil. Therefore, after the crude edible oil is refined by the refining equipment, it needs to be refined and dewaxed.

The wax in linseed oil is mainly found in the epidermis. Long-term intake of "wax" will hang on the gastrointestinal mucosa, causing digestion and malabsorption. If it is metabolized into the blood, it will increase blood lipids and induce hypertension and arteriosclerosis. , Hemiplegia, stroke, brain capillary infarction, myocardial infarction and other cardiovascular and cerebrovascular diseases. There are various impurities and waxes in the linseed oil obtained by the pressing method or the leaching method. The impurities will affect the quality and edible safety of the linseed oil, so the crude oil cannot be eaten directly. The oil plant also needs to use linseed oil refining equipment to remove impurities and wax in the crude oil to obtain the first-grade refined linseed oil.

Impurities can be removed through degumming, deacidification, decolorization, and deodorization in the linseed oil refining equipment. The removal of wax requires refining and dewaxing equipment. Conventional dewaxing is a dewaxing process that relies solely on freezing and crystallization, and then mechanically separates oil and wax without adding any auxiliary agents and auxiliary means. When separating, commonly used methods such as bag filtration, pressure filtration, vacuum filtration and centrifugal separation. At present, most domestic oil plants use a plate filter press to separate oil and wax paste, and the effect is better than that of bag filtering.

Finally, I will teach you a simple method to distinguish whether linseed oil contains wax: normal linseed oil is placed at a temperature below zero for six hours, and cotton-like suspended matter appears; this substance is "wax". Conversely, if there is no cotton-like suspended matter after freezing, it belongs to linseed oil after dewaxing.

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