Binary ion exchange reactions were investigated by many workers, but very few studies have been made on ternary systems.
Passing mixed solution of Na ion and Ca ion through the resin bed of strongly acidic, H-form cation exchanger under conditions of various equivalent ratios of the salts and flow rates, the authors measured the heights of the exchange zone for these salts. From the operation of Na ion separation which was performed by passing mixed solution through the resin bed, the authors derived the equations for calculating the degree,
S, of Na ion-separation (Eq. (17)), the separation efficiency, η, (Eq. (19)) and the minimum height,
Zm, of the resin bed capable of Na ion separation (Eq. (20)), by using the height,
H, of the exchange zone; and they compared these calculated values with the observed ones.
Equilibrium isotherms for Na
+-H
+ and Ca
++-H
+ are shown in Fig. 3. The heights of the exchange zone for Na ion and Ca ion as shown in Fig. 4 are proportional to
U0.55 and independent of the equivalent ratio within the experimental range. These heights are represented by Eqs. (21) and (22), respectively.
The calculated values which are obtained by introducing Eq. (22) into Eqs. (17) and (19), respectively. agree comparatively well with the observed values.
When Eqs. (21) and (22) are introduced into Eq. (20),
Zm is given by Eq. (23).
抄録全体を表示