SATURATION AND REGENERATION OF ION-EXCHANGERS WITH VOLUME CHANGES

• Type: Article in International Scientific Journal
• Date: 1992

Authors

DURAO, MIG (Author) Other; Carlos Costa (Author) FEUP; Alírio Rodrigues (Author) FEUP

Journal

Title: Industrial & Engineering Chemistry Research

Vol. 31

Pages: 2564-2572

ISSN: 0888-5885

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 6 Citations

ISI Web of Science

Scopus - 5 Citations

COMPENDEX

Scientific classification

CORDIS: Technological sciences > Engineering > Chemical engineering ; Technological sciences > Engineering > Simulation engineering

Other information

Authenticus ID: P-001-P21

DOI: 10.1021/ie00011a022

Abstract (EN): Models for fixed bed saturation and regeneration steps of monovalent ion exchange with shrinking/swelling of the resin are developed. The ion exchange Ag+/H+ over Duolite C20 is used as a test system: ion exchange equilibrium and swelling experimental data are measured as well as several fixed bed saturation and regeneration runs. An equilibrium model with variable interstitial velocity for the saturation step is proposed and solved analytically. This model shows good predictive capabilities for the time evolution of the resin volume, but due to the assumption of infinite mass-transfer rate it is only qualitative with respect to the prediction of breakthrough curves. A more complex model is presented for the regeneration step that accounts for bulk solution osmotic effects and resin relaxation kinetics. This model was solved numerically and was able to quantitatively explain the experimentally observed time evolution of the resin volume but again is only qualitative relative to the predictions of the concentration histories.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9