In the process of edible oil refining, decoloration is an important technological link, and its purpose is to remove pigments, impurities and other components that may affect the quality of oil, so as to make oil more transparent and pure. In this process, it is usually necessary to operate in a vacuum environment. Then, why does the decolorization process need to be carried out under vacuum environment? The following are the main reasons.

1. Prevent oxidation reaction

Some components in edible oil are easy to react with oxygen in the air at high temperature to generate harmful substances such as peroxide, which will not only affect the quality of oil, but also may produce odor. In the vacuum environment, because the oxygen is greatly reduced, the risk of oxidation reaction is significantly reduced, thus better protecting the quality and flavor of oil.

2. Improve the efficiency of decoloring agent

Activated clay or activated carbon is usually used as adsorbent in decoloration process, and these materials can adsorb pigments and impurities in oil. Under vacuum condition, volatile substances and moisture in oil are more easily removed, thus improving the adsorption efficiency of decolorant. In addition, the vacuum environment can also reduce the chance of contact between oil and air, and avoid oxidation or pollution of the adsorbent surface.

3. Reduce the operating temperature

Under the vacuum condition, the boiling point of oil will be reduced, which means that the decoloration operation can be completed at a lower temperature. This can not only save energy, but also reduce the influence of high temperature on the quality of oil and avoid thermal degradation or bad flavor.
4. Improve product stability

After vacuum decoloration, the color of oil is more stable and it is not easy to change during storage. This is because the interference of oxygen and other impurities is reduced in vacuum environment, and the stability and shelf life of oil are fundamentally improved.

To sum up, using vacuum environment in the process of oil decoloration can not only effectively prevent oxidation reaction and improve decoloration efficiency, but also reduce operating temperature and improve product stability. This technology is an indispensable link in modern oil industry, which provides a strong guarantee for the production of high-quality oil.