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제올라이트 NaA의 삼성분 이온교환평형 예측에 관한 연구
A study on Prediction of Ternary Ion Exchange Equilibria in Zeolite NaA
HWAHAK KONGHAK, June 1994, 32(3), 308-316(9), NONE
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Abstract
제올라이트 A를 통한 다성분 이온교환평형의 동태를 알아보고, 이성분 실험 데이터로부터 삼성분계의 이온 교환평형을 예측하였다. 이를 위해서 Na/Sr, Na/Cs, Sr/Cs, Na/Ca, Na/Mg, Ca/Mg의 이성분계와 Na/Sr/Cs, Na/Ca/Mg의 삼성분계에 대한 이온교환평형 실험을 수행하였으며 최근의 문헌에 실린 몇 가지 이온교환평형 데이터를 이용하였다. 예측방법으로서 비선형회귀법으로 Wilson 활동도 계수식을 적용하기 위한 매개변수를 결정한 후 주어진 한 상의 조성에서 다른 한 상의 조성을 예측하기 위한 연립방정식의 해를 시행착오법으로 구하였다. Na/Sr/Cs의 삼성분계의 이온교환평형에서 Sr 이온이 가장 큰 선택서을 보였으며 이 가운데 Na/Cs간의 선택도는 Sr 이온의 존재에 영향을 많이 받았다. Na/Ca/Mg계에서는 Ca 이온이 강한 선택성을 나타내었으며 이성분계에서의 거동과 유사함을 보였다. 예측 결과 15-20%의 상대오차 범위에서 실험치와 일치하였다.
A study has been made to predict multicomponent ion exchange equilibria data from the corresponding binary isotherms in zeolite NaA, Na/Sr/Cs and Na/Ca/Mg ternary isotherms are presented, together with isotherms for the six binary system (Na/Sr, Na/Cs, Sr/Cs, Na/Ca, Na/Mg and Ca/Mg systems). Predictive equations for these ternary systems could be solved iteratively using activity coefficients and thermodynamic equilibrium constants for the binary systems obtained from experimental data. The zeolite phase activity coefficients were obtained from the Wilson model. Na/Sr/Cs ternary system displayed high selectivity for Sr2+ ion and the presence of Sr2+ ion significantly influenced the relative selectivity of Na/Cs in this ternary system. Na/Ca/Mg ternary system showed high selectivity for Ca2+ ion and equilibrium of this system was not significantly affected by the introduction of a third ion. The prediction method was found to be in agreement with experimental data within 15-20% relative error.
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Sherman JD, "Zeolite Science and Technology," NATO ASI Series E, 583 (1984)
Semmens JD, Ross RJ, "Proceedings of the International Conference on Zeolite," 823 (1980)
Wiers HH, Environ. Sci. Technol., 16, 617 (1982)
Barrer RM, J. Chem. Soc., 37, 2342 (1950)
Sherry HS, J. Phys. Chem., 70, 1158 (1966)
문제권, "제올라이트 NaA 결정에서의 이온교환속도에 관한 연구," 연세대 박사학위논문 (1988)
Franklin KR, Townsend RP, J. Chem. Soc.-Faraday Trans., 81, 1071 (1985)
Pitzer KS, Mayorga G, J. Phys. Chem., 77, 2300 (1973)
Glueckauf E, Nature, 163, 414 (1949)
Fletcher P, Townsend RP, J. Chem. Soc.-Faraday Trans., 77, 2077 (1981)
Franklin RP, Townsend RP, Zeolites, 8, 367 (1988)
Barrer RM, J. Chem. Soc.-Faraday Trans., 69, 1669 (1973)
IMSL MATH/LIBRARY, FORTRAN Subroutine for Mathematical Applications Version 1.1-User's Manual, IMSL Inc. (1989)
Barri SAI, Rees LVC, J. Chromatogr., 201, 21 (1980)
Franklin KR, Townsend RP, J. Chem. Soc.-Faraday Trans., 84(3), 687 (1988)
