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Regenerative adsorption polymers |
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At adsorption on polymers as an adsorbens a polymer is used.
These are really plastic balls. The polymeric costs approximately 20 times more than active
carbon. For this reason polymers are only used at regenerative applications.
At the production of polymers pores of several size arise. The smallest pores of a polymer are however still larger than the micropores of active carbon. Polymers have a low selectivity to VOC adsorption. Each type of polymer
has a specific VOC for which the adsorption is better. Polymers have also high
adsorption capacity. The polymer is used in a fixed bed to catch the
VOC. The saturation and evolution of the adsorption zone are the same as at
active carbon. Polymers have a linear adsorption isotherm. This means that their
adsorption capacity increase proportionally by the partial pressure of the
VOC in the degasses. How higher press of the degasses and how higher the concentration in
the degasses, how more VOC by kg polymer can be taken. |
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Polymers are possible used with active
carbon and zeolites. This is possible both in serial where the polymers
are in the first staircase with the high concentrations and the zeolites in a second
staircase the low concentrations to capture as in a mixed bed.
The disadvantages are:
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