Introduction to chemical filters
Release time:
2020-10-25
Chemical filter is a chemical instrument to remove gaseous pollutants in the air. In the field of ventilation and air conditioning,chemical filterThe main filter material of the chemical filter is activated carbon. Typical application areas of chemical filters are: chip factories, nuclear industry, airports, environmental protection, museums, etc.
Some household appliances also use chemical filter materials. Principle of Chemical Filtrationchemical filterUnlike ordinary filters that mechanically remove impurities, it has a unique filtration system that selectively adsorbs harmful gas molecules. There are a large number of invisible micropores in the activated carbon material, mostly between 5A-500A, and the total internal surface area of the micropores in the unit material can reach 700-2300m2/g, that is, his chemical absorption capacity is very strong. In the rice grain size of activated carbon particles, the inner surface area of the micropores is equivalent to the size of the inner wall of a large living room.
Adsorption without obvious chemical reaction is called physical adsorption and mainly relies on van der Waals force. The high boiling point in the air, or other free molecules at room temperature or higher, and after contact with activated carbon, due to the capillary principle, some of the molecules condense into liquid in the pores and stay there.
Inchemical filterSome of them fill the micropores corresponding to the molecular size and form an integral body with the material. The main components of nitrogen, oxygen, carbon dioxide, hydrogen, and chlorine in the atmosphere have very low snot points, and activated carbon cannot absorb these substances. Ordinary activated carbon is a hydrophobic material, can not absorb these chemical pollutants, the adsorption capacity of water vapor is limited. Chemical filters can also adsorb some microorganisms in the air and kill them. Chemical adsorption refers to the chemical reaction of materials with harmful gases after chemical treatment.
Activated carbon can trap gas molecules by van der Waals forces. The chemical components on the material react with pollutants to form solid components or harmless gases. The main method of chemical treatment is to uniformly mix specific reagents into activated carbon, so chemically treated activated carbon is also called impregnated carbon. During use, it will continue to weaken. When it is weakened to a certain extent, the effect is damaged. If it is only physical adsorption, the harmful gas can be separated from the activated carbon by heating or steam fumigation, and the activated carbon can be regenerated.
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