Sterilizing filter
Sterilizing filter
【1】 The sterilization filter is mainly a microfiltration filter element with a large specific surface area and a filtration accuracy of more than 0.22 μ m, which is mainly used to prevent impurities, harmful bacteria and microorganisms in the air from entering the tank, production line, sterile room, etc., causing changes in water quality, products and the environment of the sterile room, meeting the technological needs of food, biochemical, beverage, beer, medicine, electronics and other industries
Filter element material
The main filter materials commonly used for filters are as follows:
Mixed cellulose ester
It is often used to make a circular single plate filter membrane for fine filtration of liquid and gas;
polypropylene
The utility model is made into a folding type, which is commonly used in a tubular filter, has a larger pore diameter, has hydrophilicity, and belongs to a coarse filter material;
Polyvinylidene fluoride
It is a kind of fine filter material, which is stable in heat and chemical resistance, good in steam sterilization and can be made into hydrophilic filter membrane. It is widely used in the filtration of sterile preparation water and injection water in pharmaceutical industry;
Polyethersulfone
It is made of foldable type, commonly used in cartridge filter, with good temperature resistance and hydrolysis resistance, hydrophilic material, and used for precise filtration of high-precision solution;
nylon
It is made of folding type, commonly used in cartridge filter, hydrophilic material, commonly used for fine filtration of liquid;
teflon
It is made of foldable, commonly used in cartridge filter and hydrophobic material. It is a kind of material widely used. It is heat-resistant, chemical resistant and stable. It is commonly used in the fine filtration of water, inorganic solvent and air.
In addition, according to the relationship between the filter material and water, it can be divided into two types: hydrophilic (water wettable) and hydrophobic (water non wettable).
Hydrophilic filter materials are mainly used in the filtration and sterilization of water or water / organic solution mixture; hydrophobic filter materials are mainly used in the filtration of solvent, acid, alkali and chemicals, tank / equipment respirator, process gas, fermentation air inlet / exhaust filtration through water being intercepted or "guided" into the membrane
characteristic
(1) Generally, the sterilizing filter adopts the cross hanging type, with horizontal in and out. Multi core filter can be designed as floor type.
(2) Some use occasions are divided into pre filter and fine filter according to actual needs.
(3) Air flow direction: from the outside to the inside through the filter element.
(4) The compressed air entering the sterilization filter must pass through at least three stages of precision filter and dryer. For oil removal, water removal and dust removal, the oil mist concentration shall be ≤ 0.01ppm, otherwise the life of the filter element will be affected, and the expected sterilization effect will not be achieved.
(5) Regular sterilization, according to the actual use of weekly or monthly 1 ~ 2 times, 30 minutes each time, using a 1 μ filtering precision of clean saturated steam sterilization. Steam temperature