Peanut oil

Peanut oil is a good quality oil and activated carbon alone is effective for decolorizing. However, if you encounter dark oil, it should be treated with a mixture of clay and activated carbon.

Soybean oil

Soybean oil can be used for both food and paint. When used for food, in addition to using an adsorbent with a higher ratio of activated carbon to clay, the other four methods for extracting cottonseed oil are similar, especially when the oil is very green. This is even more true in deep times. Activated carbon can remove substances that can produce bad odors in refined oil.

Olive oil

High-quality olive oil can be treated with a mixture of clay and activated carbon. The olive stem oil obtained by the carbon dioxide extraction method is often dark green, and can be improved by treatment with a mixture of clay and activated carbon adsorbent to turn it into a golden product.

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Corn oil

Corn oil can be treated with a mixture of clay and activated carbon, but the proportion of activated carbon needs to be smaller than other oils. Some people think that it should be processed in a partial vacuum and a temperature of 80 degrees Celsius or lower.

Coconut oil

Activated carbon alone is effective in removing impurities and colors in this oil. Satisfactory results can often be obtained when the amount of activated carbon added is less than 1%, but for those crude oils of poor quality, more needs to be added. The key is to choose the right type of activated carbon. Different types of activated carbon have a greater impact on the treatment results.

Cottonseed oil

A combination of clay and activated carbon must be used to treat this oil to achieve satisfactory results. The composition of cottonseed oil is complex, including gossypol, various sugars, resins, yellow-purple leaves, green-purple leaves, and peptone (a product of incomplete protein decomposition). The ratio of activated carbon to clay is generally (1:5) to (1:4), depending on the quality of the oil. White clay can remove pigments, while activated carbon is very effective in removing red and green colors. The two have complementary advantages. Activated carbon can also eliminate the earthy smell caused by using white clay, and can also remove undesirable but very small amounts of substances, such as saponin. , phospholipids, colloids, etc. In the process of cottonseed oil treatment, it is not advisable to use acidic clay because it is easy to decompose the oil and promotes oxidation.