The steaming (softening) process involves the contact of oil with oxygen at high temperature during the pre-pressing or pretreatment of raw materials. How to control this process plays an important role in the phosphorus content in crude oil and the difficulty of color removal.

The steaming and frying process in the soybean pretreatment process is a key process. Its energy consumption is relatively high, and some manufacturers change the original steaming and frying pan into a flat dryer in order to save energy during steaming and frying. In this way, power consumption can be saved, but since the flat-panel dryer does not strictly steam the billet, and the exposed area and time between the billet and the air are large, if the crude oil produced is used to process the first-grade oil There will be problems such as incomplete degumming and difficult removal of color. Therefore, in the refining of oil, the cost beyond the saving of electricity consumption will be increased, and the quality of the finished oil will be reduced at the same time, and it is very easy to return to color. In the operation of steaming and frying, it should be completed strictly according to the two steps of steaming and frying, so that the content of non-hydratable phospholipids will be reduced, and the amount of phosphoric acid can be reduced in the subsequent treatment, reducing the increase in the amount of oil. Oil loss, reducing the amount of clay and the oil loss caused by the increase of clay.

In the softening process of soybean processing, the softening of soybeans creates conditions for flaking and leaching. Therefore, in order to reduce the powderiness and not stick to the rolls in flaking, the moisture content of soybeans should meet certain conditions. If the moisture content of soybeans is moderate, we only need to soften them without removing water. This kind of operation requires a relatively high softening temperature. Therefore, as soon as the material enters the softening equipment, direct steam can be injected to make it heat up quickly, and then the material can be adjusted with indirect steam. If the water content is high, it is necessary to remove part of the water during softening, and to raise the temperature to soften, so as to facilitate rolling. Start as fast as possible in the heat up and adjust later. Through this operation, the content of non-hydratable phospholipids in crude oil can be reduced to facilitate the completion of degumming.