Effective Isotherms and Equilibrium Characteristics of A Weak Acidic Cation Resin

弱酸性陽離子交換樹脂之有效等溫線及平衡特徵

莊亨立(Henry K. S. Tan)

《Journal of the Chinese Institute of Chemical Engineers》 32卷4期 (2001/07) Pp. 383-389

https://doi.org/10.6967/JCICE.200107.0383

摘要

本文以理論及實驗探討弱酸性陽離子交換樹脂之平衡性質。由樹脂官能基分離常數及交換系統之選擇係數導出此類樹指之有效等溫線。導出之程式可用於氫離子與任何原子價之金屬離子的交換。以平衡理論為基礎及利用有效等溫線程式導出貫穿曲線。實驗作業係用一弱酸性陽離子樹脂，IRC-50. 樹脂床實驗使用0.05至0.1 N的NaCl及CaNO3溶液。實驗所得Na+ - H+及Ca++ - H+交換系統的貫穿曲線顯示貫穿很快就出現而且操作容量只有最終交換容量的2至3%. 比較理論及實驗貫穿曲線顯示樹脂之規格化分離常數在0.001至0.003之間，而Na+ - H+及Ca++ - H+交換系統之規格化選擇係數應在0.2至0.5之間.

並列摘要

The equilibrium properties of a weak acidic cation resin were studied theoretically and experimentally. Equations were derived for the effective isotherm of this type of resin. The derived equations are applicable to the exchange of hydrogen ions with any metallic icons with a valence of n. Based on equilibrium theory, theoretical breakthrough curves were derived from the effective isotherm expressions. Experiments were performed using IRC-50, a weak cationic resin. Column runs were conducted with 0.05 to 0.1 N of both NaCl and Ca(NO3)2 solutions The experimental breakthrougough curves obtained for both Na+ - H- and Ca++ - H+ exchange show that the breakthrough occurs very early and that the operating capacity is only 2-3% of the ultimate capacity of the resin. Comparing the theoretical breakthrough curves with the experimental ones suggests that the value of the normalized dissociation constant is between 0.001 and 0.003, and that for both the Na+ - H+ and Ca++ - H+ exchange systems, the normalized selectivity coefficient is between 0.2 and 0.5.

並列關鍵字

lon exchange ； Weak acidic resin ； Equilibrium theory