Abstract
AbstractA new cation exchange composite was synthesized through the reaction of cellulose with both melamine formaldehyde precondensate and citric acid. Factors affecting the reaction such as reactants' molar ratios, liquor ratio, time, and temperature were reported. Reaction conditions were selected to prepare a cation exchange composite having a carboxyl content of 120 meq/100 g and a nitrogen percent of 22.1. Potentiometric titration of this exchanger showed that it behaves like a tribasic acid, and the strengths, pKa, of each stage of ionization are 5, 6.7, and 9.7, respectively. Water solubility as well as durability to use of the prepared exchanger were evaluated. © 1992 John Wiley & Sons, Inc.
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