Intraparticle diffusivities in liquid-phase adsorption with nonlinear isotherms

Abstract

Diagrams showing concentration change in an agitated tank adsorber are presented to estimate intraparticle diffusivities under nonlinear isotherms, where either pore or surface diffusion is assumed to be controlling. The adsorption kinetics of DBS and phenol from dilute aqueous solutions onto two kinds of activated carbon are measured, and the intraparticle diffusivities are estimated with diagrams. An approximation method for the case where surface diffusion is controlling, which is a modification of the Dryden and Kay method, is also proposed. This method gives good agreement with the diagrams obtained numerically. © 1975, The Society of Chemical Engineers, Japan. All rights reserved.