Kielland方程和RHCO_3-CO_3~(2-)离子交换平衡

KIELLAND EQUATION AND RHCO_3-CO_3~(2-) ION EXCHANGE EQUILIBRIUM

摘要: 提出了把Kielland模型用于有机阴离子交换树脂研究二元酸根交换平衡的依据,用RHCO_3-CO_3~(2-)体系证明了Kielland方程可推广到Ⅰ-Ⅱ价交换平衡。用~(14)C标记技术求出了μ=0.30、t=25℃时混合交换平衡常数K_B~A=2.41,特征常数C=0.24。和RHSO_4-SO_4~(2-)交换体系对比,明确了选择性次序为:HSO_4~->SO_4~(2-)>>CO_3~(2-)>HCO_3~-,还对二元酸根在树脂内的转化作了讨论。

Abstract: The basis for studing the ion exchange equilibrium of dibasic radicals on the organic ion exchange resin with Kielland model is suggested. The Kielland equation can be extended to Ⅰ-Ⅱ valence exchange equilibrium by the study of RHCO3-CO2 3- sytem. The mixedexchange equilibrium constant KA B= -CO2 3-/GCO3-2·aRHCO32/aR2CO3 = 2.41 and the characte-ristic constant C=0.24 at t=25℃, μ=0.30 are determined by 14C tracer. Compared with the exchange system RHSO4-SO2 4-, the sequence of selectivity is as follows: HSO-4> SO2 4-CO2 3->HCO-3. The problem about the conversion of dibasic acid radicals in the resin phase is also discussed.