SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (1): 104-113.DOI: 10.1016/j.cjche.2019.03.031

• Separation Science and Engineering • Previous Articles     Next Articles

CO2 absorption performance in a rotating disk reactor using DBU-glycerol as solvent

Hualing Duan1,2, Kun Zhu1,2, Houfang Lu1,2, Changjun Liu1, Kejing Wu2, Yingying Liu2, Bin Liang1,2   

  1. 1 School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
    2 Institute of New Energy and Low Carbon Technology, Sichuan University, Chengdu 610065, China
  • Received:2019-01-21 Revised:2019-03-25 Online:2020-03-31 Published:2020-01-28
  • Contact: Yingying Liu
  • Supported by:
    Supported by the National Natural Science Foundation of China (21606154, 21878190).

CO2 absorption performance in a rotating disk reactor using DBU-glycerol as solvent

Hualing Duan1,2, Kun Zhu1,2, Houfang Lu1,2, Changjun Liu1, Kejing Wu2, Yingying Liu2, Bin Liang1,2   

  1. 1 School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
    2 Institute of New Energy and Low Carbon Technology, Sichuan University, Chengdu 610065, China
  • 通讯作者: Yingying Liu
  • 基金资助:
    Supported by the National Natural Science Foundation of China (21606154, 21878190).

Abstract: Gas-liquid mass transfer of rotating disk reactor was studied in CO2 absorption using 1,8-diazabicyclo-[5.4.0]-undec-7-ene (DBU)-glycerol solution as solvent. Effects of the rotating disk structure and various operation parameters on the CO2 absorption rate and CO2 removal efficiency were investigated. The rotating disk with optimal holes is conducive to mass transfer of CO2 and the formation of thin liquid film at the opening increases the gas-liquid contact area. With the increase of rotating speed, the liquid flow pattern on the rotating disk surface changes from thin film flow to separated streams and creates extra liquid lines attached to the rim of the disk, which leads to a very complicated change on the CO2 absorption rate and CO2 removal efficiency. The overall gas-phase mass transfer coefficient increases 138% as the rotating speed increasing from 250 to 1400 r·min-1. Increasing temperature from 298 to 338 K can enhance the CO2 absorption rate due to lowering the viscosity of the solvent. The rate-determined step for the absorption is focused on the gas side. The rotating disk reactor can effectively enhance the absorption of CO2 with viscous DBU-glycerol solvents.

Key words: Gas-liquid flow, Carbon dioxide, Rotating disk reactor, Absorption rate, Viscosity

摘要: Gas-liquid mass transfer of rotating disk reactor was studied in CO2 absorption using 1,8-diazabicyclo-[5.4.0]-undec-7-ene (DBU)-glycerol solution as solvent. Effects of the rotating disk structure and various operation parameters on the CO2 absorption rate and CO2 removal efficiency were investigated. The rotating disk with optimal holes is conducive to mass transfer of CO2 and the formation of thin liquid film at the opening increases the gas-liquid contact area. With the increase of rotating speed, the liquid flow pattern on the rotating disk surface changes from thin film flow to separated streams and creates extra liquid lines attached to the rim of the disk, which leads to a very complicated change on the CO2 absorption rate and CO2 removal efficiency. The overall gas-phase mass transfer coefficient increases 138% as the rotating speed increasing from 250 to 1400 r·min-1. Increasing temperature from 298 to 338 K can enhance the CO2 absorption rate due to lowering the viscosity of the solvent. The rate-determined step for the absorption is focused on the gas side. The rotating disk reactor can effectively enhance the absorption of CO2 with viscous DBU-glycerol solvents.

关键词: Gas-liquid flow, Carbon dioxide, Rotating disk reactor, Absorption rate, Viscosity