The loss in the edible oil refining process has always been the focus of food processing industry. Refining is a necessary step to remove impurities from crude oil and make edible oil meet the requirements of safety, hygiene and quality. However, there is a certain loss in this process.

Firstly, edible oil refining includes many links, such as degumming, deacidification, decoloration, deodorization and dewaxing. In these processes, impurities in crude oil are removed, and some oil may also be taken away. For example, impurities such as phospholipids are separated during degumming, which may lead to slight loss of oil. In the deacidification process, free fatty acids are removed by chemical or physical methods, and some oils may also be lost.

Secondly, the refining process also involves high temperature treatment and chemical reaction, which may have a certain impact on oil molecules. For example, in the deodorization stage, odor substances are removed by high-temperature steam treatment, and some volatile components may be lost with steam. In addition, in order to achieve a better decolorization effect, the use of adsorbents may also adsorb part of the oil, thus increasing the loss.

Nevertheless, modern technology has significantly reduced the loss in the refining process. By optimizing process flow, selecting efficient equipment and reasonably controlling operating conditions, the loss of oil can be effectively reduced. For example, the use of advanced physical refining technology can reduce the use of chemical reagents, thus reducing the loss rate. In addition, some new adsorbents and filter materials can also reduce the loss of oil while ensuring the refining effect.

Generally speaking, according to the quality of raw materials and refining process, the loss rate in the process of edible oil refining is usually between 1% and 5%. For higher quality raw materials, the loss rate may be lower. For raw materials with more impurities, the loss rate may be slightly higher.

Generally speaking, although the loss in the edible oil refining process is inevitable, it can be controlled within a reasonable range through scientific management and technological innovation, so as to maximize production efficiency and economic benefits. This will not only help enterprises to reduce costs, but also provide consumers with higher quality edible oil.