In the production process of leaching soybean oil, sometimes there are powdery substances. This phenomenon may be related to the process flow and operating conditions of many links. The following are the analysis of several main reasons:

First of all, in the process of oil production in solvent extraction plant, soybeans need to go through pretreatment processes such as crushing and embryo rolling. The purpose of these procedures is to process soybeans into a shape suitable for leaching process. However, if the operation is improper in the process of crushing or embryo rolling, such as unreasonable equipment adjustment or poor moisture control of raw materials, it may lead to too fine soybean particles and produce powdery substances. These powders may enter the leaching system in the subsequent process.

Secondly, the solvent used in the leaching process (such as n-hexane) contacts with soybeans to extract oil from them. If the material contains too much powder, these fine particles may flow with the solvent and eventually enter the leached oil. In addition, the powder may block the filtration system of the leaching equipment, which will affect the process efficiency and lead to more impurities entering the grease.

Thirdly, the leached crude oil needs to be filtered and refined to remove impurities. However, if the filtering precision of the filtering equipment is insufficient or the equipment is not properly maintained, the powdery substances may not be completely removed, thus remaining in the final soybean oil.

In order to reduce the generation and existence of powder, the following measures can be taken:

1. Optimize the pretreatment process: during the crushing and embryo rolling, ensure the reasonable adjustment of equipment and strictly control the moisture content of soybean to reduce the generation of ultrafine particles.

2. Improve the filtration system: use high-efficiency filtration equipment in the process of leaching and subsequent refining to better remove powder and other impurities.

3. Strengthen equipment maintenance: regularly check and maintain production equipment to ensure its normal operation and avoid powder mixing due to equipment failure.

In a word, the existence of powder in soybean oil is usually caused by the details in the production process. By optimizing the technological process of solvent extraction and edible oil refining and strengthening quality control, the powder content can be effectively reduced and the quality of soybean oil can be improved.