Decolorization of oil refining is a very important step in the process of oil processing. Its purpose is to remove pigments and impurities from oil and improve the appearance and quality of oil. However, the decolorization effect is often influenced by many factors. The following are the analysis of several key factors.

1. Crude oil quality and pretreatment

The quality of crude oil directly affects the decoloration effect. Natural pigments in oil are relatively easy to remove, but due to improper storage or oxidation in the production process, new pigments or immobilized pigments may be generated, which are difficult to remove. Therefore, it is very important to improve the quality of crude oil. In the production process, oil oxidation should be avoided as much as possible to ensure the best decoloration effect.

2. Quality of adsorbent

Adsorbent is the core material in the process of decoloration, and its quality and activity directly determine the efficiency of decoloration. Highly active adsorbents can adsorb pigments and impurities in oils more effectively, and at the same time reduce the decoloration temperature, thus reducing the influence of thermal oxidation side reactions on the stability of refined oil. Therefore, when selecting adsorbents, priority should be given to their activity, purity and applicability.

3. Stirrng speed

The stirring speed also has an important influence on the uniformity and efficiency of decoloration process. Proper stirring speed can promote the full contact between adsorbent and oil and improve the adsorption efficiency. However, too fast stirring speed may lead to uneven dispersion of adsorbent and affect decoloration effect. Therefore, it is necessary to adjust the stirring speed according to the specific process conditions to ensure the best operating state.

4. Vacuum degree and operating temperature

In the process of decoloration, the side reaction of thermal oxidation may lead to the immobilization of pigment or the formation of new pigment, and at the same time affect the stability of refined oil. Vacuum environment can effectively reduce the involvement of oxygen in the air, thus reducing the risk of oil oxidation. It is suggested to keep the vacuum degree at about 93.3kPa in production. In addition, the decolorization temperature can be reduced by using high-activity adsorbent or decompression decolorization process, thus further reducing the occurrence of thermal oxidation side reactions.

To sum up, the decolorization effect of edible oil refining is affected by many factors, including crude oil quality, adsorbent performance, stirring speed, vacuum degree and operating temperature. By optimizing each link and strictly controlling the production conditions, the efficiency and quality of oil refining and decoloration can be significantly improved, laying the foundation for producing high-quality oil products.