Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (6): 1709-1716.doi: 10.1016/j.cjche.2020.02.001

• Energy, Resources and Environmental Technology • Previous Articles     Next Articles

Desorption of VOC from polymer adsorbent in multistage fluidized bed

Jiale Zheng1,2, Wenli Song1,2, Lin Du1,2, Lina Wang1,2, Songgeng Li1,2   

  1. 1 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-11-12 Revised:2020-01-16 Online:2020-06-28 Published:2020-07-29
  • Contact: Wenli Song, Lin Du;
  • Supported by:
    This work was supported by the National Key R&D Program of China (2018YFC1901300), the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA 21040400) and the National Natural Science Foundation of China(21978305).

Abstract: The desorption process of volatile organic compounds (VOC) from a polymer adsorbent in counter-current multistage fluidized bed was studied. And a mathematical model considering the mass transfer dynamics was developed, which was validated from experiment data. The gaseous ethyl acetate mass transfer was discussed, and the limiting step is the intraparticle mass transfer of the desorption process. The value of intraparticle mass transfer coefficient is between 1.85×10-6 and 1.38×10-5 m·s-1 under temperature of 100-160℃. Experiments under different operating conditions were carried out. The effects of operating conditions such as gas-solid flow ratio, gas inlet temperature and total stage number of multistage fluidized bed on outlet VOCs concentration and desorption efficiency were discussed. The maximum outlet VOCs concentration and corresponding desorption efficiency of the multistage fluidized bed desorber was calculated under different gas inlet temperatures and total stage numbers.

Key words: VOC, Desorption, Mass transfer, Fluidized bed