Enhancing consecutive reactions during three phase hydrogenation with a semibatch liquid phase

Päivi Mäki-Arvela*, Arnaud Denecheau, Kasper Alho, Johan Wärnå, Kari Eränen, Tapio Salmi, Dmitry Yu Murzin

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

Kinetics for citral hydrogenation was investigated over a Ni/Al2O3 catalyst both in semibatch and in batch mode with respect to the liquid phase. In the former case the liquid phase was pumped out from the reactor continuously, while the amount of catalyst was kept constant during the hydrogenation in the latter case. The idea with liquid phase drainage was to increase the catalyst bulk density with increasing reaction time. The effect of increasing catalyst bulk density on reaction kinetics and selectivity was investigated both qualitatively and quantitatively. The main parameters were hydrogen pressure (5-21 bar) and temperature (50-90 °C). The product selectivity, which should theoretically be independent on the changes in catalyst bulk density, varied with varying catalyst bulk density, especially at higher reaction temperatures due to catalyst deactivation. The simplified kinetic model with lumped kinetic and deactivation parameters was applied to the experimental data being able to explain results obtained under semibatch conditions with continuous liquid phase drainage out of the reactor.

Original languageEnglish
Pages (from-to)268-275
Number of pages8
JournalChemical Engineering Journal
Volume134
Issue number1-3
DOIs
Publication statusPublished - 1 Nov 2007
MoE publication typeA1 Journal article-refereed

Keywords

  • Consecutive reaction
  • Hydrogenation
  • Kinetic modeling
  • Semibatch reactor

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