What is Activated Carbon
Activated carbon, also known as activated carbon black, is black powder or granular amorphous carbon. Activated carbon is mainly composed of oxygen elements besides carbon. Activated carbon is a porous coal with low bulk density and large specific surface area because microcrystalline carbon is arranged irregularly and there are fine holes between the cross-links during activation. Activated carbon is odorless, odorless, sandless, insoluble in any solvent, selective for various gases, high capacity for organic pigments and nitrogen-containing alkali.
Gas Purification:
For example, the use of activated carbon containing solvent vapor in the air to recover solvents; the use of activated carbon filtration to deodorize the air; used in industrial respirators to prevent poisons and so on.
Gas separation:
For example: recovering benzol from city gas; recovering gasoline, propane and butane from natural gas; treating waste gas from Fischer-Tropsch synthesis to recover its diameter, etc.
Liquid phase adsorption:
For example, in the refining sugar industry, activated carbon adsorption is used to decolorize the sugar industry; in the refining industry, activated carbon is used to decolorize organic substances; and in the electroplating industry, activated carbon is used to purify organic impurities in order to ensure the quality of the electroplating surface and to remove phenols from waste gas.
Influencing factors and solutions of activated carbon adsorption treatment:
The adsorption performance of activated carbon is related not only to the properties of activated carbon itself, but also to the physical properties of adsorbate and the conditions of adsorption operation. Modification of activated carbon to meet certain treatment requirements, or to match a suitable type of activated carbon varieties and operating conditions is currently a research hotspot.
Application of Activated Carbon Adsorption Box in Waste Gas Treatment of Painting and Spraying:
Because of the low VOCs concentration and low emission temperature, the exhaust gas of automobile painting and spraying is generally treated by activated carbon adsorption method, which is a mature, effective and low equipment cost process. Our company has used an integrated equipment of activated carbon adsorption and catalysis. Its principle is to adopt the combined process of adsorption concentration and catalytic combustion. Activated carbon can adsorb and concentrate VOCs, which can be reused after desorption. The desorbed concentrated VOCs can be burned at low temperature through electric heating of catalyst to achieve the purpose of treating pollutants. The combustion hot air is recycled for desorption of activated carbon to achieve the purpose of energy saving.
Technical Introduction:
Activated carbon is a black powdered, granular or pellet-shaped amorphous carbon with porous structure. The main ingredient is carbon, and it also contains a small amount of oxygen, hydrogen, sulfur, nitrogen and chlorine. It also has the fine structure of graphite, but the grains are small and the layers are irregular. It has a large surface area (500-1000_/g). It has strong adsorption capacity and can adsorb gases, liquids or colloidal solids on its surface. The adsorption of gas and liquid can be close to the quality of activated carbon itself. Its adsorption is selective, and non-polar substances are easier to adsorb than polar substances. In the same series of substances, the higher the boiling point, the easier the substance to be adsorbed, the higher the pressure, the lower the temperature, the higher the concentration, the larger the adsorption capacity. On the contrary, the desorption of favorable gases with decompression and heating is beneficial.