Abstract
Intensified trickle bed reactors were developed for catalytic wet air oxidation (CWAO) of phenol, by generating microbubbles before gas/liquid fluid flows along catalyst packed-beds. By coupling gas-liquid microdispersion module, phenol disappearance rate significantly increases under the same operating conditions and phenol conversion reaches 92% in 22 seconds at 160°C and 1000 kPa. Effects of operating conditions were studied systematically and results demonstrated characteristics of high-interaction regime at low Reynolds number. Comparison of effects among mass transfer and reaction steps shows CWAO reaction is controlled by resistance to liquid-solid mass transfer of phenol in most cases, while gas-liquid mass-transfer-resistance is ignorable. A dimensionless correlation, Sh = 2.29φ−0.91(ReL + ReG)0.04, was established, by considering influences of liquid film thickness and fluid flow situations on liquid-solid mass transfer coefficient in microbubble-in-liquid/catalyst-particle system. The study would provide an effective method for intensifying CWAO and other liquid-solid-mass-transfer-resistance-controlled gas/liquid/solid catalytic reactions and help understand mass transfer mechanism in new gas/liquid/solid system.
Original language | English |
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Article number | e10029 |
Journal | Journal of Advanced Manufacturing and Processing |
Volume | 1 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 Oct 2019 |
Keywords
- intensified process fundamentals
- modeling and simulation
- process intensification