Chromium(III) removal by epoxy-cross-linked poly(ethylenimine) used as gel-coat on silica. 2: A new kinetic model
- Univ. of Waterloo, Ontario (Canada). Dept. of Chemical Engineering
Regenerable gel-coat chelating resins with fast sorption kinetics and sorption selectivity have application potential for removal of trace metal ions even in large-scale operations. Poly(ethylenimine) has been gel-coated on high surface area silica and insolubilized by cross-linking with a low molecular weight diepoxide (epoxy equivalent 180 g). The sorption of Cr(III)/SO{sub 4}{sup 2{minus}} on this gel-coated sorbent under vigorous agitation has characteristics of particle diffusion control (pdc) with homogeneous (gel) diffusion in the resin phase. A new mathematical model is proposed for such sorption in gel-coat resin and solved by applying operator-theoretic methods. The analytical solution so obtained shows good agreement with experimental sorption kinetics for relatively low levels of resin conversion.
- OSTI ID:
- 514631
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 36, Issue 6; Other Information: PBD: Jun 1997
- Country of Publication:
- United States
- Language:
- English
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