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
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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。
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关键词:
- Kielland方程 /
- RHCO_2-CO_3~(2-) /
- 离子交换平衡
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·[aRHCO3]2/[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.-
Keywords:
- Kielland equation /
- RHCO_3-CO_3~(2-) /
- Ion exchange equilubrium.
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[1] 邱陵等,原子能,第3期,216(1965) . [2] Kielland, J. Soc. Chem. Ind., 54, 2327 (1935) . [3] Griessbach, R., Austaushadsorption in Theorie und Praxis, chapt 3. , Akademie--Verlag G.m.b.H.,Berlin, 1957. [4] Maclnnes, D. A., Becher, D., J. Am. Chem. Soc., 55, 2630 (1953) . [5] Wheaton, R. M., Bauman, W. C., Ind. Eng. Chem., 43, 1088 (1951) .
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