Initial flux decline and initial rejection increase for swollen ionic membranes
Article first published online: 9 MAR 2003
Copyright © 1976 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 20, Issue 5, pages 1153–1164, May 1976
How to Cite
Van Der Velden, P. M. and Smolders, C. A. (1976), Initial flux decline and initial rejection increase for swollen ionic membranes. J. Appl. Polym. Sci., 20: 1153–1164. doi: 10.1002/app.1976.070200502
- Issue published online: 9 MAR 2003
- Article first published online: 9 MAR 2003
- Manuscript Revised: 10 JUN 1975
- Manuscript Received: 16 APR 1975
During the initial stage of operation, membrance performance in hyperfiltration experiments will be time dependent. For swollen ionic membranes, fluxes show an initial decrease while rejections initially increase in magnitude. These phenomena, also referred to as compaction, can be described by a model proposed here in which the wet membrane thickness decreases in time as a combined response to stepwise changed process parameters pressure and concentration. The response has been described by a linear first-order differential equation and worked out by use of known concepts of flux and rejection for swollen ionic membranes. Experimental data appear to be in good agreement with model predictions.