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What is a chemical filter?

Release time:

2021-11-19

Chemical filters can remove molecular organic pollutants from the air. In the field of ventilation and air conditioning, activated carbon is the main filter material of chemical filters.chemical filterThe typical application places are chip factories, nuclear industry, airports, environmental protection, museums, automobile air conditioners, etc. Some domestic appliances also use different chemical filter materials.

With the development of industry and the expansion of cities, the concentration of harmful gases around us is increasing. With the advancement of technology and the improvement of life, people's requirements for pure air are getting higher and higher, so people's demand for chemical filters is also increasing year by year.

Chemical filters selectively adsorb some harmful gas molecules instead of mechanically removing impurities like ordinary filters. There are many micropores in activated carbon materials that are invisible to the naked eye, most of which are between 5 and 500 (1=0.1 nm), and the total internal surface area of micropores in the unit weight material is up to 700 square meters/G to 2300 square meters/G. That is to say, in the rice grain size of activated carbon particles, the internal surface area of the micropores is equivalent to the internal wall of the large living room.

化学过滤器

　　chemical filterAccording to the treatment methods of different materials, activated carbon adsorption is mainly divided into "physical adsorption" and "chemical adsorption". In the habit, people call it adsorption without obvious chemical reaction physical adsorption. After the glass molecules with higher boiling point in the air (above room temperature) contact with activated carbon, they are partially condensed into liquid by micropores, stay there by capillary principle, and partially filled with micropores with similar molecular size, and integrated with the material. Atmospheric nitrogen, oxygen, carbon dioxide, hydrogen, argon and other major economic components of the boiling point is very low, activated carbon technology can not control and they. Ordinary activated carbon is hydrophobic, so the adsorption capacity of water vapor is limited. In principle, all porous material culture is through the adsorption of substances, activated carbon is not, but the activated carbon adsorption of those social substances is just the development of air conditioning systems in the field of harmful gases that we need to deal.

Physical adsorption of chemical filters is difficult to effectively remove all chemical contaminants. In some cases, the activated carbon material is chemically treated to improve the removal of certain contaminants. After analyzing the chemical information, the adsorption process of chemical reaction between the material and the harmful gas is called chemical adsorption. Activated carbon captures gas molecules, and the chemical composition of the material reacts with pollutants to produce solid material components or harmless gases. The main method of chemical treatment is to uniformly mix certain reagents in activated carbon, so the chemical treatment of activated carbon is also called "impregnated carbon".

In addition to adsorption, the porous substance itself can also be a catalyst that promotes chemical reactions (participates in the reaction, but the substance itself is not consumed). For example, a catalyst for ozone can also be used as a support for other catalysts. When related to adsorption, harmful gases in the air are called "adsorbents" and activated carbon is called "adsorbents". While the adsorbent grabs the adsorbent material, part of the adsorbent material will also be lost. Inchemical filterDuring use, the adsorption capacity of activated carbon continues to weaken, and if it weakens to a certain extent, the filter will be discarded. As long as the physical adsorption, you can use the method of heating or steam fumigation to separate the harmful gas from the activated carbon, so that the activated carbon regeneration.