Liquid circulation and mass transfer in an external-loop airlift reactor with partitioning plates

Hideki Tsuge, Satoru Otatsume, Ken Kobayashi, Koichi Terasaka, Manabu Hayasaki, Hirotsugu Kobayashi

Research output: Contribution to journalArticle

2 Citations (Scopus)


The effect of partitioning plates in the riser of external-loop airlift reactors (ELAs) was studied to increase the gas holdup by the restraint of bubble coalescence and the control of the liquid circulation velocity, and to improve the mass transfer in highly viscous liquids. The liquid circulation velocity, the gas holdup in the riser and the volumetric mass transfer coefficient were measured by changing the following parameters, that is, the number of stages, opening ratio of partitioning plates, diameter of a perforated hole and physical properties of liquids. The following conclusions were obtained; the liquid circulation velocity in the riser decreases with the increased number of stages. The gas holdup in the riser is affected by the liquid circulation velocity and bubble coalescence caused by partitioning plates. The gas holdup in the riser and the volumetric mass transfer coefficient increase with the increased number of partitioning plates. In highly viscous pseudoplastic solutions, the mass transfer rate was improved by the installation of partitioning plates into the riser of ELAs.

Original languageEnglish
Pages (from-to)941-946
Number of pages6
Issue number8 SPEC. ISS.
Publication statusPublished - 2004 Aug 1



  • Bubble
  • External-loop airlift reactor
  • Liquid circulation
  • Master transfer
  • Partitioning plate

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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