Premium
Batch adsorption for pore diffusion with film resistance and an irreversible isotherm
Author(s) -
Weber Thomas W.
Publication year - 1978
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450560206
Subject(s) - adsorption , diffusion , spheres , thermodynamics , materials science , steady state (chemistry) , diffusion equation , mechanics , composite material , chemical engineering , chemistry , physics , engineering , metric (unit) , operations management , astronomy
Equations are developed for finite‐batch, irreversible adsorption where both pore diffusion and film resistance are significant. Quasi‐steady state behavior is assumed and comparisons are made for sheets, cylinders, and spheres. The equations for the three shapes are generalized to a single form. For equal volumes of adsorbent, when the external film controls, spheres attain equilibrium more quickly than cylinders, and cylinders more quickly than sheets. When internal diffusion controls and the ratio of the final to the initial solution concentration is high, this ordering of equilibrium times is preserved; however, if the ratio is very low, the ordering is reversed.