Solvent extraction is a common chemical separation technology, which extracts the target substance from raw materials by solvent. Pre-pressing treatment is usually needed before solvent extraction. So, why?

First, pre-pressing can remove impurities and impurities in raw materials. In actual production, raw materials often contain various impurities, such as suspended solids, solid particles and sediments. These impurities will affect the extraction effect of solvents and reduce the purity and quality of products. Therefore, these impurities can be removed by pre-pressing treatment, which can purify raw materials and improve the efficiency and product quality of subsequent solvent extraction.
Second, pre-pressing can improve the efficiency of solvent use. In the process of solvent extraction, the target substance in raw materials usually exists in the form of solid or liquid, while the solvent exists in the form of liquid. If the raw material contains a large number of solid particles or precipitates, it will lead to the poor infiltration and penetration effect of the solvent, reduce the contact area and contact time between the target substance and the solvent, and thus affect the use efficiency of the solvent. Through pre-pressing treatment, solid particles and precipitates in raw materials can be removed, the use efficiency of solvents can be improved, and the extraction rate of target substances can be improved.
In addition, pre-pressing can also reduce the blockage and damage of subsequent equipment. In the process of solvent extraction, if the raw material contains a large number of solid particles or sediments, it will easily cause the blockage and damage of the subsequent equipment, which will affect the continuity and stability of production. These solid particles and sediments can be removed by pre-pressing treatment, which reduces the risk of blockage and damage of subsequent equipment and ensures the normal production.
In a word, pre-pressing is a very important step in solvent extraction process, which can purify raw materials, improve the efficiency of solvent use, reduce the risk of equipment blockage and damage, and improve the purity and quality of products. Therefore, it is very necessary and important to pre-press before solvent extraction.