ISSN:
0001-1541
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
The differential equation for diffusion of a solute in a quasi-homogeneous, spherical, ion exchange particle, previously solved for time-dependent boundary conditions, is applied to an activated carbon adsorption system. This solution differs from the infinite volume solution which assumes constant boundary conditions. The result is applied to experimental data and yields effective adsorbent-phase diffusion coefficients. Equilibrium and rate studies were performed by using the aqueous phenol solution - activated carbon system. The rigorous solution to the diffusion equation is compared with a recently published frequency domain solution. Excellent agreement is obtained for values of the effective diffusion coefficient computed from the two rate equations.It is recommended that the rigorous model be used for mechanism and diffusion coefficient determination. After the mass transfer parameters have been obtained, the simplified rate equation may be used for either lumped parameter or distributed parameter models for prediction of fixed-bed adsorber response. Further studies are required to determine if the simplified model adequately describes fixed-bed behavior.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aic.690160204
