The microporous membrane filter, in addition to having a large unit area and a small footprint, mainly solves the problem of quickly filtering out materials outside the machine through the upper main filtration zone. The auxiliary filtration zone in the middle or bottom can filter out the remaining materials in one go, avoiding the "mixing" of the upper and lower batch numbers of materials, which is particularly important for fine chemicals, pharmaceutical factories, and food factories.
The working principle of microporous membrane filters mainly includes the following aspects:
1. Screening function: When the pore size of the microporous membrane is smaller than the size of the particles in the filtered material, these particles will be trapped by the membrane, while smaller molecules or ions can pass through the pores, similar to the function of a sieve.
2. Adsorption: Some particles or molecules may be adsorbed on the membrane surface due to their affinity with the membrane material, especially when the membrane material has specific chemical properties.
3. Charge effect: If the membrane material carries a charge, it may attract or repel charged particles, further enhancing the filtration effect.
4. Diffusion and permeation: For very small molecules, they may pass through membrane pores through diffusion or permeation, but this is usually a secondary mechanism in microporous filtration.
♦ Microporous membrane filters are widely used in various fields due to their efficient filtration performance, including but not limited to:
♦ Water treatment: used for drinking water purification, industrial wastewater treatment, seawater desalination, etc.
♦ Food and beverage: Removing impurities and microorganisms in the production process of fruit juice, beer, dairy products, etc.
♦ Pharmaceutical: Ensure the sterility and purity of the product during the drug production process.
♦ Chemical industry: Removing harmful substances and particulate matter in the chemical production process.