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담지된 용질 속에서 용매의 흡착과 확산 -담지된 Oleic Acid속에서 용매의 흡착과 확산-
Adsorption and Diffusion of Solvents in a Supported Solute -Adsorption and Diffusion of Solvents in a Supported Oleic Acid -
HWAHAK KONGHAK, August 1993, 31(4), 422-429(8), NONE
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Abstract
Oleic acid와 용매 사이의 상호 작용을 흡착과 확산의 관점에서 조사하기 위하여 oleic acid를 실리카 겔에 담지시킨 충전층에서 용매의 펄스-응답을 측정하고 이를 모멘트 이론으로 해석하여 물질전달 파라미터를 계산하였다. 축 방향 분산 계수와 세공 확산 계수의 값에는 큰 변화가 없었으나 5용매에 대한 흡착 평형 상수와 흡착 속도 상수값은 acetone, toluene, n-octane, ethylacetate, benzene의 순서로 증가하였다. 전보[7]의 결과와 연관시켜 볼 때, 흡착 평형 상수와 흡착 속도 상수값은 초임계 유체 추출용 entrainer의 선택에서 하나의 유력한 수단이 될 수 있음을 알 수 있다.
To investigate the interaction between oleic acid and solvents in view of adsorption and diffusion, pulse-responses for a fixed bed of silica gel coated with oleic acid were measured. The moment method was used to determine mass transfer parameters. Values of axial dispersion coefficient and pore diffusion coefficient showed no appreciable change and values of adsorption equilibrium constant and adsorption rate constant for five solvents increased in the order : acetone<toluene<n-octane<ethylacetate<benzend. It was found that in comparison with the previous work[7], values of adsorption equilibrium constant and adsorption rate constant might be a potential means to screen entrainers for supercritical fluid extraction.
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Sheets MR, Marchello JM, Hydrocarb. Process., 42(12), 99 (1963)
Tassio D, Hydrocarb. Process., 49(7), 114 (1970)
Joshi DK, Prausnitz JM, AIChE J., 30(6), 552 (1984)
Tavana A, Chang J, Randorph AD, Rodriguez N, AIChE J., 35(4), 645 (1989)
Kim BU, Kang US, HWAHAK KONGHAK, 30(6), 635 (1992)
Weber T, Chakravorti R, AIChE J., 20, 228 (1974)
Huang JC, Rothstein D, Wu BG, Madey R, Sep. Sci. Technol., 17, 1417 (1983)
Forsythe R, Madey R, Photinos PJ, Rothstein D, Sep. Sci. Technol., 23(14-15), 2319 (1988)
Schneider P, Smith JM, AIChE J., 14, 762 (1968)
Hashimoto N, Smith JM, Ind. Eng. Chem. Fundam., 13, 115 (1974)
Carleton FB, Kershenbaum LB, Wakeham WA, Chem. Eng. Sci., 33, 1239 (1978)
Lin Y, Ph.D. Dissertation, Worcester Polytechnic Institute, U.S.A. (1988)
김부웅, 김인실, 연구보고(부산대학교), 23, 369 (1982)
Park IS, Ph.D. Dissertation, Pusan National University, Pusan, Korea (1985)
Kaguei S, Lee DI, Wakao N, Kag. Kog., 6, 397 (1980)
Lee DI, Ryu HW, HWAHAK KONGHAK, 19(2), 95 (1981)
Suzuki M, "Adsorption Engineering," Kodansha, Tokyo, Japan (1990)
Schneider P, AIChE J., 14, 768 (1968)
Cussler EL, "Diffusion, Mass Transfer in Fluid Systems," Cambridge University Press, U.S.A. (1984)
