Manufacturing Activated Carbon

    The 3 principle stages creating activated carbon

    Activated carbon is a versatile material used in numerous applications, including environmental remediation, solvent recovery, catalysis, and the oil and gas industry. The carefully controlled manufacturing process ensures that activated carbon meets the stringent requirements of these industries, providing effective solutions for purification, adsorption, and contamination control.

    Activated carbon is produced through a exact process that involves the carbonization, activation, and post-treatment. The following are the stages of the manufacturing process:

    Carbonization

    Carbonization is the first stage in the production of activated carbon. It involves heating the raw organic materials, such as wood, coconut shells, or coal, at high temperatures in an inert atmosphere to remove volatile components. This process results in a char, which is a solid material composed primarily of carbon.

    • Raw Material Selection: The choice of raw material affects the properties of the final product. Commonly used materials include coconut shells, wood, peat, coal, and lignite.
    • Pyrolysis: The raw material is subjected to pyrolysis in an oxygen-free environment, typically in a furnace. Temperatures range from 600°C to 900°C.
    • Formation of Char: The heat decomposes the material, leaving behind a solid char composed mainly of carbon.

    Activation

    Activation is the second stage, where the char is treated to develop the porous structure that characterizes activated carbon. This stage can be performed using physical or chemical methods.

    Steam and Carbon Dioxide Activation:

    • Steam Activation: The char is exposed to steam at temperatures between 800°C and 1100°C. The steam reacts with the carbon atoms, creating a network of pores.
    • Carbon Dioxide Activation: Similar to steam activation, carbon dioxide is used to develop the porous structure at high temperatures.

    Chemical Activation:

    • Chemical Agents: The raw material is impregnated with activating chemicals such as phosphoric acid, potassium hydroxide, or zinc chloride before carbonization.
    • Heat Treatment: The impregnated material is then heated to temperatures between 450°C and 900°C, which creates pores by removing the chemical agents.

    Post-Treatment

    Following activation, the activated carbon undergoes stage 3, which is the post-treatment processes to enhance its properties and prepare it for various applications.

    Finishing Processes:

    • Washing: Residual activating agents and impurities are removed through washing with water or acids.
    • Drying: The washed activated carbon is dried to remove moisture.
    • Sizing: The dried product is then crushed and sized according to the desired specifications.

    Quality Control :

    • Testing: The activated carbon is tested for various properties such as surface area, pore volume, hardness, and adsorption capacity.
    • Packaging: Finally, the product is packaged and stored for distribution to different industries.