How to Make Activated Carbon from Wood

different shapes of activated carbon from wood

What is Wood-based Activated Carbon

Activated carbon from wood, also known as wood-based activated carbon, is an activated carbon prepared from sawdust, wood, charcoal, etc. The appearance of wood-based activated carbon can be granular, cylindrical, or powder.

Wood activated carbon has a long service life. Compared with ordinary coal-based activated carbon, the average service life can be 4-5 times longer. It has high mechanical strength, a high ignition point, and is safer to use. Wood based activated carbon has strong adsorption performance, developed pore structure, high adsorption capacity, high strength, low ash content, and reasonable pore size distribution. Activated carbon from wood is cost-effective, suitable for the recycling of organic gases in various places, and has a wide range of applications.

Wood-based Activated Carbon has a Wide Range of Uses

Wood based activated carbon raw materials
Wood based activated carbon raw materials

Gas phase adsorption.

It is used in the fine desulfurization and dechlorination of synthetic ammonia, natural gas, coke oven gas, etc., and VOCs waste gas treatment.

Liquid phase adsorption.

Wood-based activated carbon has low ash content, few impurities, and is easy to purify. In in-depth sewage treatment, powder-activated carbon from sawdust and wood is also widespread.

Organic solvent recovery.

Benzene gas toluene, xylene, recovery of acetone in the acetate fiber industry, recovery of CS2 in viscose staple fiber production, etc.

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Catalyst carrier

Wood-based activated carbon has a huge specific surface area, which is conducive to the high dispersion of the supported catalytically active substances, and the preparation of high-activity catalysts. Wood activated carbon has a strong adsorption capacity, and activated carbon loaded with catalytic active components can be used as a catalytic adsorbent, such as platinum or silver loaded on activated carbon, which can play catalytic oxidation and sterilization. Activated carbon itself can also activate certain molecules, such as: activating oxygen molecules.

Production Method and Main Equipment of Activated Carbon from Wood

The two popular preparation methods for wood-based activated carbon are the physical method and the chemical method. Both of these methods need to be carried out in an activated carbon production line. Among them, the main equipment used in the production process of wood-based activated carbon includes activated carbon rotary kiln, silo, conveyor, feeder, exhaust gas purification system, burner, discharge cooling conveyor, dryer, Raymond mill, etc.

Production of wood activated carbon by physical method

The physical method is to first carbonize the wood at high temperature, take it out, and pulverize it into small pieces of 5-25 mm, and then activate it with high-temperature steam in an activation furnace.

Hot steam is introduced from the upper part of the activation furnace. During this process, activated carbon is removed from the bottom of the reaction activation furnace. The carbonization reaction is an endothermic reaction process at high temperatures. The carbonization process requires that the heating and activation furnace temperature is not lower than 800℃, and the hydrogen and carbon monoxide generated by the reactants during combustion are heated.

In practice, hydrogen and carbon monoxide are released through the carbonization reaction to release enough heat to supplement the heat required for the reaction, and the temperature in the activation furnace is kept between 800-900°C so that the activation reaction can be made without being performed under heating.

Production of wood activated carbon by chemical method

Homogenization of activated carbon

The chemical activation method is to prepare activated carbon by uniformly mixing wood carbon-containing raw materials and chemicals, and then going through carbonization, activation, chemical recovery, rinsing, drying, and other processes under a certain temperature.

Phosphoric acid, zinc chloride, potassium hydroxide, sodium hydroxide, sulfuric acid, potassium carbonate, polyphosphoric acid, and phosphate ester can all be used as activation reagents. Although different chemical reactions occur, some of them corrode, hydrolyze or dehydrate raw materials, and some of them oxidize. However, these chemicals can promote the activation of raw materials to some extent. The most commonly used activators are phosphoric acid, zinc chloride, and potassium hydroxide.

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