ACID-BASE EQUILIBRIUM ON WEAKLY BASIC POLYACRYLIC ANION-EXCHANGE RESINS

摘要

We obtained experimental curves describing potentiometric titration of weakly basic polyacrylic anion exchangers with different types of amino groups. We found that conversion of a resin with tertiary amino groups (Lewatit VP.OC.1072) from a weakly to a strongly dissociated form produced an ideal solution of resinates in the resin phase. For an anion exchanger containing a certain proportion of strongly basic quaternary groups (Purolite A 845) a deviation of the resin solution from ideality was observed in the low a region. We determined the proportion of strongly basic groups in Purolite A 845. In the case of Relite MG 1 and Relite MG 1/P containing polyamines as exchange centers we noted a significant departure of the resinate solutions from ideality, which was caused by an electrostatic interaction between amino groups in the salt form.