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Effect of the Structure of Some New Weak‐Base Ion‐Exchange Resins on Anion Selectivity
Author(s) -
Bolto B.A.,
Jackson M.B.,
Siudak R.V.
Publication year - 1985
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.198500063
Subject(s) - chemistry , selectivity , amberlite , substituent , ion exchange resin , ion exchange , weak base , base (topology) , ion , inorganic chemistry , dilution , polymer chemistry , organic chemistry , adsorption , catalysis , mathematical analysis , physics , mathematics , thermodynamics
Abstract The selectivity of some poly(N‐substituted diallylamine) ion‐exchange resins and some polyamine ion‐exchange resins prepared from crosslinked polyepichlorohydrin toward the systems SO = 4 /Cl − , NO − 3 /Cl − and HCO − 3 /Cl − was measured. The polyallylamine resins show the usual selectivity behaviour towards SO = 4 over Cl − with the affinity of SO = 4 increasing with dilution of the solution and decreasing with reducing ionization of the resin, providing equilibrium has been reached. The size of the nitrogen substituent on the resin, the resin capacity (which affects the overall charge density) and the base strength of the resin all influence the resin selectivity. The resin type and the nature of the two ions being exchanged determine the relative importance of each factor. In the systems considered in this paper, apart from the normal factors which affect selectivity, the most noteworthy parameter appeared to be the size of the nitrogen substituent. The selectivity behaviour toward the HCO − 3 /Cl − system of a polyamine prepared from crosslinked polyepichlorohydrin and aminated with homopiperidine compared favourably with Amberlite IRA 68 in a DESAL‐type process.