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What is the steam activation process of activated carbon?

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Carrie Ge

Activated Carbon is a non-graphite form of carbon which could be produced from any carbonaceous material such as coal, lignite, wood, paddy husk, coir pith, coconut shell, etc. coconut shell activated carbon for Sale Activated carbon manufactured from coconut shell is considered superior to those obtained from other sources mainly because of small macrospores structure which renders it more effective for the adsorption of gas/ vapor and for the removal of colour and odour of compounds.

 

Activated carbon has the strongest physical adsorption forces or the highest volume of adsorbing porosity of any material known to mankind. Activated carbon can have a surface of greater than 1000m²/g.

 

Manufacturing Process

There are two types of processing process.

  • Steam Activation.
  • Chemical Activation.

 

The process of activation is carried out in two stages. First the coconut shell is converted into shell charcoal by carbonization process which is usually carried out in mud-pits, brick kilns and metallic portable kilns. The coconut shell charcoal is activated by reaction with steam at a temperature of 900oC - 1100oC under controlled atmosphere in a rotary kiln. The reaction between steam and charcoal takes place at the internal surface area, creating more sites for adsorption. The temperature factor, in the process of activation is very important. Below 900oC the reaction becomes too slow and is very uneconomical. Above 1100oC the reaction becomes diffusion controlled and therefore takes place on the outer surface of the charcoal resulting in loss of charcoal.https://www.granular-activated-carbon.com 

 

There is wide variety of activated carbon with exhibits different characteristics depending upon the raw material and activation technique used in their production. Understanding both Absorptive and Physical characteristics of the material is very important in the selecting an activated carbon.

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