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How to choose the direct leaching process and pre-expression leaching process of leaching equipment

September 07, 2021

There are two leaching methods commonly used in the production of leaching equipment, namely direct leaching and pre-expression leaching. Direct leaching is to send the pretreated oil directly into the leaching equipment to extract the oil. The pre-expression extraction is to first squeeze the oil to extract the oil, then pulverize the squeezed cake into a certain particle size, and then extract the remaining oil with an extraction equipment. During production, the choice of leaching process can be determined according to the variety of raw materials, the requirements for by-products and the size of production capacity.

 leaching process

1. Variety of raw materials: oils with low oil content are suitable for one-time leaching process, such as soybeans, rice bran and other oils. After these oils are leached to extract the oil at one time, the oil content in the meal can reach an extremely low value; the oil content is high The oil is suitable for the pre-extraction leaching process. The oil is first squeezed to extract oil, and the resulting cake is crushed into a certain particle size, and then the leaching method is used to extract the oil. Such as cottonseed, rapeseed, sunflower seed and so on.


2. Requirements for products and by-products: the main products after oilseeds are oil and cakes. The requirements for products and by-products are different, and the process conditions should also be changed accordingly. For example, when soybeans are processed, soybean meal should be used to extract protein powder: It requires large peeling, with less crude fiber content, relatively increasing protein content.


3. The size of the production capacity: combined with the oil plant's own investment budget, oil plants with a large budget can choose more complex processes and advanced equipment. Oil plants with a small budget can choose simpler processes and production equipment.