Volatile organic compounds (VOCs) are the most common air pollutants emitted from chemical, petrochemical and allied industries. Adsorption is one of the most effective methods of controlling VOCs emission. Fluidized bed adsorption/desorption process is proposed for handling large flows of contaminated gaseous streams. The expected advantages are continuous processing, the ability to treat large flows under moderate pressure drop, the possibility to handle dusty gases, good mass and heat transfer between fluid and particles. For fluidized bed adsorption process the adsorbents are subject to strong attrition and conventional active carbons particles are not suitabe. A perfectly spherical activated carbon with strong attrition resistance and good VOC adsorption ability is developed for fluidized bed application. Polystyrene beads were used as precursor to make polymer-based active carbon (PCB) adsorbent through different activation methods, including steam activation, ZnCl2 activation and synergistic activation with both steam and ZnCl2. The active carbon adsorbent with synergistic activation presented high specific surface area (1702.49 m2/g) than that from other activation process. The measurement of static adsorption capacity of PCB with dimethylbenzene, acetone, ethyl acetate and hexane for different PBS adsorbents are conducted and presented. In the research of dynamic adsorption, a fixed bed reactor was used to explore the ethyl acetate adsorption behavior on PCB adsorbents and the mass transfer zone length was obtained. Yoon?Nelson model was used to describe the adsorption behavior of ethyl acetate on adsorbents and model parameters are compared for different active carbon adsorbents. The particle size distribution of PCB adsorbents is between 0.208?0.832 mm, with the averaged particle diameter of 0.495 mm. The PCB adsorbents had good abrasion resistance with attrition index less than 0.1% and that is suitable for fluidized bed application.
Yuan CHANG Jiale ZHENG Lin DU Songgeng LI Wenli SONG
. Polymer-based spherical active carbon and its VOCs adsorption performance for fluidized bed application[J]. The Chinese Journal of Process Engineering, 2018
, 18(5)
: 1112
-1118
.
DOI: 10.12034/j.issn.1009-606X.217418
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