Dependence of gas adsorption rates on carbon granule size and linear flow velocity

✍ Scribed by J.A. Rehrmann; L.A. Jonas

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 553 KB
• Volume: 16
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(78)90115-x

✦ Synopsis

&tract-A study was made of the dependence of the adsorption rate constant of an activated carbon for dimethyl methylphosphonate vapor on carbon granule size and superficial linear velocity using the adsorption kinetics equation to calculate the rate constant from critical bed weight values. Over a 3t%fold range of velocities and a 7-fold range of granule diameters it was found, in accord with adsorption kinetics theory, that although the adsorption capacity for the vapor was invariant, the time for vapor breakthrough of the bed varied because of the effects of linear flow velocity and carbon granule size on the adsorption rate constant. In general, the rate constant increased nonlinearly with increase in velocity and decrease in carbon granule size. The slowest adsorption kinetics existed for the largest granule size at the lowest linear flow velocity, becoming increasingly faster as the velocity was increased and/or the gramde size was decreased. For the smallest granule size the rate constant reached a limiting value of 26OOsec-' becoming essentially independent of linear velocity due to a change in the rate controlling step.