Granular Activated Carbon (GAC)
About
Granular Activated Carbon (GAC) consists of irregularly shaped particles with sizes ranging from 0.2 to 5mm. Granular activated carbons are made by activating the base material directly or after an agglomeration step.
Direct vs. agglomerated carbon
There are two processes to make direct activated carbons:
- Grinding the raw material to a selected size in order to obtain the desired product after carbonisation and activation.
- Carbonisation and activation of the raw material, after which the activated product is crushed and sieved into the required granulometry.
Agglomerated carbons are produced by pulverising a selected mixture of different coals to particles smaller than 45µm. The powdered coals are mixed with a binder, pressed to briquettes, broken to granules of the required size and then further processed to the required activity.
Granular activated carbons for liquid and gas applications
Granular Activated Carbon is used in both liquid and gas phase applications:
- Granular sizes from 0.2 up to 2 mm are most commonly used in liquid phase applications, as adsorption kinetics are more important than pressure drop.
Granular sizes from 2 up to 5 mm are typically used for gas phase applications where the pressure drop is generally more important than the adsorption kinetics.
DESOTEC offers direct and agglomerated activated carbons in different sizes. Our technical specialists can help you to select the right size for your application.
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