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Decolorization in the oil refining process is to improve the color of the oil and provide qualified raw oil products for the deodorization of the oil. Therefore, in the oil refining process, the formulation of the color standard of the decolorized oil needs to be based on the quality requirements of the oil and its products, and strive to obtain the maximum improvement of the oil color with low loss.
1. Oil quality and pretreatment
Natural pigments in oil are easier to remove, while new pigments formed during oil storage and oil production or pigments fixed due to oxidation are generally more difficult to remove. It can be seen that only by improving the quality of crude oil and avoiding oxidation of the oil in the processing link can the decolorization effect be ensured.
The quality of the pre-treatment of oil refining and decolorization has an important influence on the efficiency of decolorization. When there are residual impurities such as gums, soap particles and suspended solids in the oil to be decolorized, these impurities will occupy part of the activated surface of the adsorbent, thereby reducing the decolorization efficiency or increasing the amount of adsorbent.
2. The quality and amount of adsorbent
The adsorbent is a key factor affecting the decolorization effect. Different kinds of adsorbents have their own characteristics. According to the specific requirements of grease decolorization, reasonable selection of adsorbents can achieve the decolorization effect economically.
Activated clay is a commonly used adsorbent for oil decolorization. Different specifications of activated clay show different properties. Its activity is affected by the original soil, acid treatment, moisture and other factors. While expecting to obtain high activity, the influence of these factors on oil acid value, filtration rate and oil loss rate should also be considered. The suitable activated clay and the added amount of a certain oil under specific decolorization conditions can generally be optimized through laboratory sample tests.
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