Continuous Neutralization of NaOH Solution with CO2 in an Internal-Loop Airlift Reactor

Thomas Michael Pichler*, Bernd Stoppacher, Alexander Kaufmann, Matthäus Siebenhofer, Marlene Kienberger

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The neutralization of NaOH with CO2 in a continuously operated airlift reactor with gas flow rates up to 10 NL min−1 and gas phase recycle was investigated. Neutralization experiments were performed at 25 °C and the amount of absorbed CO2, as well as the NaOH feed rate, were recorded. The reaction rate was calculated based on the two‐film theory and empirical equations for several parameters. The calculations of the volumetric mass transfer coefficient, the liquid phase circulation velocity, and the gas holdup were experimentally validated. The reaction rate and the process efficiency were modeled with a deviation of 5 %.
Original languageEnglish
Pages (from-to)38-47
Number of pages10
JournalChemical Engineering & Technology
Issue number1
Publication statusPublished - Jan 2021


  • Airlift reactor
  • Mass transfer
  • NaOH neutralization
  • Reaction rate
  • Reactive absorption

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Industrial and Manufacturing Engineering

Fields of Expertise

  • Sustainable Systems


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