Selection of filtration and separation equipment in chemical process production

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This post is mainly intended to share and discuss knowledge related to filtration and separation, as well as the selection of filtration and separation equipment for industrial use. All experts are welcome to participate and provide their valuable insights. To select the right filtration and separation equipment, it is essential to understand the principles of material separation as well as the appropriate equipment to use. First, it is necessary to understand and master the physical and chemical properties of the substance as well as the goals to be achieved, such as the components of the material, its name, state of existence, molecular size, density, viscosity, melting point, boiling point, and so on. The first thing that needs to be clarified is the issue of filtration precision, particularly the relationship between mesh size and microns in practical applications. The mesh size of a filtering screen refers to the number of pores per square inch. The higher the mesh number of the sieve, the smaller the pores, and the smaller the particle sizes that can pass through. Generally, the mesh number × pore size (μm) = 15000. This is the calculation formula provided by the American standard. Our country uses American standards. Currently, there are three international standards: the American standard, the British standard, and the Japanese standard. Among them, those of the United States and the United Kingdom are similar, while the Japanese standard differs significantly. The following is a table showing common screens and their particle sizes in μm. The higher the mesh number of the screen, the smaller the pores, and thus the smaller the particles that can pass through.