농도-펄스법에 의한 기체 삼성분계 흡착 등온식의 산출

김부웅; 구헌서

HWAHAK KONGHAK, Vol.34, No.2, 165-170, April, 1996

Export Citation

농도-펄스법에 의한 기체 삼성분계 흡착 등온식의 산출

Determination of Adsorption Isotherms of Gaseous Ternary System by Concentration-pulse Technique

김부웅, 구헌서

초록

선형흡착평형상수(k₁)를 포함한 삼성분계(흡착기능 물질 2 + 운반기체 1)의 흡착 모델 식을 C₁/C₁=k₁+α₁ C₁^m1 + β₁₂ C₂ⁿ¹²와 같이 설정하고, 이성분계(흡착기능 물질 1 + 운반기체 1)에 대하여 크로마토그래피-perturbation방법 중 농도-펄스기법(concentration-pulse technique)과 모멘트 분석에 의한-에 의하여 설정된 삼성분계 모델식의 변수값을 산출하였으며 이를 크로마토그래픽에 의한 삼성분계 실험으로 확인하므로써 정적인 방법(static method)에 의하여 검증하던 종전의 과정을 크로마토그래피 자체만으로 수행할 수 있었다. 그 결과 설정된 모델식으로 계의 해석이 가능하였고 농도-펄스기법의 적용을 흡착 가능한 물질 2종과 흡착평형상수로부터 benzene, n-octane, chloroform의 흡착열(H_ad)을 van’t Hoff식에 의하여 -10.07, -8.66, -6.26kcal/gmol로 각각 구하였다.

The model of adsorption isotherm for ternary system contained 1 non-adsorbable and 2 adsorbable species was set up as C₁/C₁=k₁+α₁C₁^m1+β₁₂C₂ⁿ¹². The parameters in model equation were produced from adsorption experi-ments of binary system(adsorbable species 1+non-adsorbale species 1) by concentration-pulse technique of perturba-tion method, and moment analysis. The isotherm equations of ternary systems were verified by ternary system experi-ments with only gas chromatography itself, without static method. Therefore it is possible the application of concentra-tion-pulse technique to extend to the ternary gas system contained 1 non-adsorbable and 2 adsorbable species. And the adsorption heats(H_ad) of benzene, n-octane, and chloroform was calculated by van’t Hoff equation with adsorption equilibrium coefficients by moment analysis as -10.07, -8.66, -6.26kcal/gmol respectively.

Keywords:Adsorption;Adsorption Equilibrium;Perturbation;Concentration-pulse

[References]

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[1] Yang TR, "Gas Separation by Adsorption Processes," Butterworths, Boston (1987)

[2] Eberly PE, Kimberlin CN, Trans. Faraday Soc., 57, 1169 (1961)

[3] James DH, Phillips CSG, J. Chem. Soc., 1066 (1954)

[4] Stalkup FI, Deans HA, AIChE J., 9, 106 (1963)

[5] Helfferich F, Peterson DL, Science, 142, 661 (1963)

[6] Danner PR, Nicoletti NP, Al-Ameeri RS, Chem. Eng. Sci., 35, 2129 (1980)

[7] Hyun SH, "Gas-Mixture Adsorption Isotherms and Diffusivities in Molecular Sieve by Perturbation Chromatography," Doctoral Dissertation, the Pennsylvania State Univ., Pa. (1982)

[8] Conder JR, Young CL, "Physicochemical Measurement by Gas Chromatography," John Wiley & Sons, NY (1979)

[9] VanderWlist E, VanderMeijden J, J. Chromatogr., 79, 1 (1973)

[10] Ruthven DM, Kumar R, Ind. Eng. Chem. Fundam., 19, 27 (1980)

[11] Hyun SH, AIChE Symp. Ser., 78, 19 (1982)

[12] Barker PE, Thawait S, J. Chromatogr., 295, 479 (1984)

[13] Ruthven DM, J. Chromatogr., 351, 337 (1986)

[14] Schneider P, AIChE J., 14, 886 (1968)

[15] Kim BU, Koo HS, HWAHAK KONGHAK, 31(4), 422 (1993)

[16] Deans HA, Horn FJM, Klauser G, AIChE J., 56, 426 (1970)

[17] Motoyuki S, "Adsorption Engineering," Elsevier, NY (1990)

[18] Glueckauf E, Disc. Faraday Soc., 7, 12 (1949)

[19] Helfferich F, Klein G, "Multicomponent Chromatography," Marcel Dekker Inc. (1970)

[20] Schneider P, Smith JM, AIChE J., 14, 762 (1968)