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The role and precautions of grease decolorization section

September 26, 2021

The function of the decolorization section in the oil refining process is mainly reflected in changing the color of the oil and providing qualified raw oil products for the deodorization of the oil. 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 degree of change in the oil color with low loss.

 Decolorization equipment in edible oil refining equipment

What are the main items in the decolorization section of the oil refining process?

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 speeding up the quality of crude oil and avoiding the oxidation of oil in the processing link can the decolorization effect be achieved. 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 the key factor that affects the decolorization effect. Different kinds of adsorbents have their own characteristics. According to the specific requirements of grease decolorization, a reasonable choice of adsorbents can economically obtain a good decolorization effect.

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 optimal addition amount of a certain oil under specific decolorization conditions can generally be optimized through laboratory sample tests.