Chanda, Manas and Rempel, Garry L (1999) Gel-coated ion-exchange resin: A new kinetic model. In: Chemical Engineering Science, 54 (17). pp. 3723-3733.
arti.pdf - Published Version
Restricted to Registered users only
Download (184Kb) | Request a copy
Regenerable 'gel-coated' cationic resins with fast sorption kinetics and high sorption capacity have application potential for removal of trace metal ions even in large-scale operations. Poly(acrylic acid) has been gel-coated on high-surface area silica (pre-coated with ethylene-vinyl acetate copolymer providing a thin barrier layer) and insolubilized by crosslinking with a low-molecular-weight diepoxide (epoxy equivalent 180 g) in the presence of benzyl dimethylamine catalyst at 70 degrees C, In experiments performed for Ca2+ sorption from dilute aqueous solutions of Ca(NO,),, the gel-coated acrylic resin is found to have nearly 40% higher sorption capacity than the bead-form commercial methacrylic resin Amberlite IRC-50 and also several limes higher rate of sorption. The sorption on the gel-coated sorbent under vigorous agitation has the characteristics of particle diffusion control with homogeneous (gel) diffusion in resin phase. A new mathematical model is proposed for such sorption on gel-coated ion-exchange resin in finite bath and solved by applying operator-theoretic methods. The analytical solution so obtained shows goad agreement with experimental sorption kinetics at relatively low levels (< 70%) of resin conversion.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Elsevier Science.|
|Keywords:||Gel-coated resin;Poly(acrylic acid);Weakly acidic resin;Sorption kinetic model.|
|Department/Centre:||Division of Mechanical Sciences > Chemical Engineering|
|Date Deposited:||22 Jul 2009 11:56|
|Last Modified:||19 Sep 2010 05:28|
Actions (login required)