Ion exchange equilibria under pressure
Article first published online: 17 JUN 2004
Copyright © 1966 American Institute of Chemical Engineers
Volume 12, Issue 3, pages 495–498, May 1966
How to Cite
Hamann, S. D. and McCay, I. W. (1966), Ion exchange equilibria under pressure. AIChE J., 12: 495–498. doi: 10.1002/aic.690120319
- Issue published online: 17 JUN 2004
- Article first published online: 17 JUN 2004
- Manuscript Accepted: 17 DEC 1965
- Manuscript Revised: 16 DEC 1965
- Manuscript Received: 24 AUG 1965
Previous work on the ionization equilibria of weak acids and bases at high pressures suggested that compression should favor the transfer of protons from a weakly acidic resin to a weakly basic one in a mixed bed system, and that the resulting increase of ionization should extract cations and anions from the surrounding solution. In agreement with this idea it has now been observed that the equilibrium concentration of a solution of sodium chloride around a mixture of De-Acidite M and Zeo-Karb 226 resins is almost halved when the pressure is raised from 1 to 3,000 atm. The change is completely reversible.
The measurements indicate that the proton transfer process involves a contraction of about 15 cc. mole−1, which is remarkably close to the analogous contraction [15 to 18 cc. mole−1] that occurs when a proton is transferred from a free carboxylic acid to an amine in solution.