We are leading manufacturer of Activated Carbon
Activated carbon or activated carbon or activated carbon or activated carbon is a form of carbon that has been processed to obtain small, low volume pores that have a very large surface available for adsorption and chemical reactions. It is used in different applications such as purification (air, gas and water), metal extraction, decaffeination, gold recovery, medicine, wastewater treatment, air filters in gas masks and filter masks, compressed air filters.
What is adsorption?
Adsorption is the process by which the molecules of a liquid or gas are trapped by a solid surface. Activated carbon has a very high internal surface area and therefore, an ideal material for adsorption.
How Does Activated Carbon Works?
Activated carbon attracts and retains organic chemicals from vapour and liquid streams and cleans them of unwanted chemicals. It does not have a large capacity for these chemicals, but it is very profitable to treat large volumes of air or water to eliminate diluted concentrations of contamination. For a better perspective, when people ingest chemicals or are suffering from food poisoning, they are ordered to drink a small amount of activated charcoal to absorb and eliminate the poisons.
Activated carbon is produced from carbonaceous source materials such as walnut shells, wood and coal. There are two processes by which we can produce activated carbon. These are:
- Physical activation: The raw material is developed in activated carbons that use gases and is generally made by combining the following processes:
- Carbonization: The material with carbon content is pyrolyzed at temperatures in the range of 600-900 °C, in the absence of air (generally in an inert atmosphere with gases such as argon or nitrogen).
- Activation/Oxidation: The raw material or carbonized material is exposed to oxidizing atmospheres (carbon dioxide, oxygen or vapor) at temperatures above 250 °C, generally in the temperature range of 600-1200 ° C.
- Chemical activation: The raw material is impregnated with chemicals such as acids such as phosphoric acid or bases such as potassium hydroxide, sodium hydroxide or salts such as zinc chloride, followed by carbonization at temperatures in the range of 450-900 ° C. It is believed that the Carbonization/activation stage proceeds simultaneously with chemical activation. This technique can be problematic in some cases, because, for example, traces of trace zinc can remain in the final product. However, chemical activation on physical activation is preferred due to the lower temperatures and the shorter time needed to activate the material.
Activated carbons are difficult to classify based on their behaviour, surface characteristics and preparation methods. However, depending on their physical characteristics, there are three main forms of activated carbon:
- Granular Activated Carbon (GAC) – particles of irregular shape with sizes ranging from 0.2 to 5 mm. This type is used in both liquid and gas phase applications.
- Powder Activated Carbon (PAC) – pulverized carbon with a size predominantly less than 0.18 mm (US Mesh 80). These are mainly used in liquid phase applications and for the treatment of flue gases.
- Extruded Activated Carbon (EAC) – extruded and cylindrical shape with diameters of 0.8 to 5 mm. These are mainly used for gaseous phase applications due to their low pressure drop, high mechanical resistance and low dust content.
- Charcoal Activated Carbon Cloth (ACC) – Activated carbon is also available in special forms such as a cloth and fibers.