Abstract
In this study, possibilities of increasing the efficiency of electrothermal regeneration of the granular BPL carbon were evaluated. The adsorbent was used to purification of propan-2-ol (IPA)-laden air streams with specified concentrations ranging from 2 to 11 g/m3. The experiments were carried out in the fixed beds containing either a single layer of BPL 4 × 6 carbon or a double layer of BPL 4 × 6 and BPL 6 × 16 carbons (volume ratio 9:1). The adsorbent bed was placed between two pyramid-shaped electrodes and was regenerated using direct resistance heating method. The regeneration measurements were carried out in the following parameter range: voltage 14–19 V, temperature set point 403 K, and nitrogen flow rate 0.06 m3/h. Electrical resistance of the double-layer bed was lower than the single layer due to the larger contact area between the fine BPL carbon particles and the upper electrode. This caused an increase in desorption degree by ca. 4% and a decrease in total energy consumption by 10%. The use of thermal insulation of the double-layer bed resulted in increasing the process energy efficiency. The regeneration was more energy efficient with a higher initial IPA content in the regenerated bed.
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This work was presented at the 44th International Conference of Slovak Society of Chemical Engineering held in Tatranské Matliare on May 21–25, 2018.
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Downarowicz, D., Kowalski, K. Electrothermal regeneration of BPL activated carbon: possibilities for improvement of process efficiency. Chem. Pap. 74, 1945–1956 (2020). https://doi.org/10.1007/s11696-019-01042-y
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DOI: https://doi.org/10.1007/s11696-019-01042-y