Skip to main content
Kinetics of a Moving Boundary Ion-Exchange Process
Industrial & Engineering Chemistry Process Design and Development
  • Paul R. Dana, Iowa State University
  • Thomas D. Wheelock, Iowa State University
Document Type
Publication Version
Published Version
Publication Date
The acid elution of the dark blue cupric ammine complex from a cation-exchange resin produced a sharply defined moving boundary within each bead, which was photographed and measured to provide rate data. 'Analysis of the data by means of a theoretical model indicated that the overall elution process was controlled by a combination of internal and external mass transfer when acid concentrations less than 1.0 N were employed. At these acid concent1'ations the interdiffusion coefficient for the resin phase was found to be 3 X 10-6 cm2/sec, independent of acid concentration but somewhat dependent on particle size. Data collected at· higher acid concentrations were not amenable to analysis by the method employed. The model should be useful for predicting the time required to elute the cupric ammine complex or for designing equipment to carry out this process.

Reprinted (adapted) with permission from Ind. Eng. Chem. Fundamen., 1974, 13 (1), pp 20–26. Copyright 1974 American Chemical Society.

Copyright Owner
American Chemical Society
File Format
Citation Information
Paul R. Dana and Thomas D. Wheelock. "Kinetics of a Moving Boundary Ion-Exchange Process" Industrial & Engineering Chemistry Process Design and Development Vol. 13 Iss. 1 (1974) p. 20 - 26
Available at: