Chloride-sulphate exchange on anion resins — kinetic investigation, IX. Direct, isotopic and reverse exchange

✍ Scribed by L. Liberti; R. Passino; D. Petruzzelli

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 615 KB
• Volume: 48
• Category: Article
• ISSN: 0011-9164
• DOI: 10.1016/0011-9164(83)80005-8

✦ Synopsis

Experimental kinetics of direct, isotopic and reverse Cl-/SO, exchange on different anion resins are presented.

At very low concentration (C = 6 X 10T3 N) extremely high resin selectivity toward sulphates occurs (separation factors ranging from 52 to 589). Consequently chemical interaction of interdiffusing species within the resin seems to influence the rate determining step, exception made for isotopic exchange. Application of model equations from Nernst-Planck and SN? rate theories is discussed. SYMBOLS c c D _4i(B) D A(B) 'A(B) -valence of ion A(B) %/so, -separation factor, defined by Eq. (1) ! -retardation factor -film thickness (cm) X -equivalent fraction of SO, in solution at equilibrium Y -equivalent fraction of SO, in resin at equilibrium x A(B) -ionic mobility of ion A(B) in solution (cm2/ohm) 0 -refers to infinite dilution