Abstract
Gas and liquid loadings of a co-current downflow trickle-bed reactor were separately modulated employing α-methyl styrene (AMS) hydrogenation on Pd/Al 2O 3 to determine if the hydrogenation rate could be increased. Modulating the liquid flow rate resulted in a large increase in the AMS conversion rate. The explanation of the improvement in rate appears to be that modulation caused a transition from the trickling to the foaming-pulsing hydrodynamic regimes. The foam created in the latter regime persisted in the trickling portion of the cycle. Modulation of the gas loading was not effective probably because a regime transition did not occur.
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