Activated carbon adsorption and desorption issues
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Questions: 1. What are the selectivity and characteristics of activated carbon in adsorbing volatile organic compounds (propanes, chloropropanes)? 2. What are the techniques for desorption after saturation, including temperature, desorption methods, time required, and the substances that are produced? I know that desorption can be achieved using steam purging. Does anyone know the specific process details? If so, please help me out. Thank you!
1. Activated carbon has decent adsorption properties; it can absorb a wide range of substances. It can be used for propylene, but imported activated carbon is required as it is relatively expensive, costing around 20,000 yuan per ton.
Active carbon fibers can also be used for adsorption, and steam desorption is employed in this process. It depends on what substances are present in the exhaust gases; if it’s just propylene, then what is released after desorption is propylene and water
The surface chemical properties of the pore structure of activated carbon affect its adsorption capacity; matching the molecular diameter of the adsorbate to the pore diameter of the activated carbon can improve the adsorption performance. A brief introduction to the desorption process scheme is of little help to the original poster; the design should reach at least the level of a preliminary design
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Desorption is generally carried out using steam, but it depends on what substance is being absorbed and on the volume of air flow; all these factors play a role.