The enhancement of the gas-absorption rate in agitated slurry reactors due to the adhesion of gas-adsorbing particles to gas bubbles

✍ Scribed by H. Vinke; P.J. Hamersma; J.M.H. Fortuin

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 691 KB
• Volume: 47
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(92)85074-l

✦ Synopsis

The effect of small gas-adsorbing particles on the quasi steady-state absorption rate of a gas into a degassed slurry is investigated in an agitated slurry reactor in which no chemical reaction occurs. This investigation shows that, in a slurry reactor, gas-adsorbing particles can adhere to gas bubbles so that during steady-state operation a fraction r of the gas-liquid interface ls covered by adhering particles, resulting in an enhancement of the gas-absorption rate with respect to the particle-free situation. A model is derived to calculate the enhancement of the physical gas-absorption rate as a function of the fraction of bubble-surface coverage r at different particle concentrations in the slurry. This Enhanced Gas-Absorption mode1 is experimentally verified by flotation experiments and by hydrogen absorption into aqueous solutions containing different concentrations of small catalyst particles.