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CFC-12/HFC-32 혼합기체의 활성탄소섬유에 대한 흡착평형
Adsorption Equilibrium of CFC-12/HFC-32 Mixture on Activated Carbon Fiber
HWAHAK KONGHAK, February 1997, 35(1), 69-76(8), NONE
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Abstract
셀룰로우즈계 활성탄소섬유를 이용하여 CFC-12, HFC-32 순수기체 및 CFC-12/HFC-32 혼합기체에 대한 282-323 K의 온도 범위와 0-1 atm의 압력 범위에서의 흡착평형실험을 행하였다. CFC-12와 HFC-32의 순수 및 혼합물의 흡착평형은 본 연구에서 사용된 활성탄소섬유에 대해 CFC-12가 HFC-32보다 높은 선택성을 나타내었다. CFC-12와 HFC-32 순수기체의 흡착평형의 경우 Langmuir-Freundlich 모델이 Langmuir 모델에 비해 정확한 예측치를 보였다. 혼합물 예측의 경우 IAS와 IH-SPD-NAS 모델이 있어 Extended Langmuir-Freundlich 모델보다 훨씬 잘 예측하였다. IH-SPD-NAS 모델을 사용한 혼합물의 흡착평형 분석에 있어 CFC-12는 Raoult의 법칙으로부터 약간 양의 이탈을 보였으며, HFC-32의 경우 희석농도의 영역에서 (YCFC → 1.0) 상대적으로 큰 양의 이탈을 보였다. 그러나 흡착상에서 비이상성의 영향은 본 계의 경우 그 영향이 중요하지 않았다.
Adsorption isotherms for CFC-12 and HFC-32 at 0-1atm, and binary adsorption equilibria of these mixture at 100mmHg were measured on an activated carbon fiber(ACF) at 283-323 K. In this experimental rage, ACF showed better selectivity for CFC-12 in the pure and binary experiments. For pure gas adsorption isotherms, the Langmuir-Freundlich model showed better predictions than the Langmuir model did. In the case of the binary adsorption equilibria, the IAS and IH-SPD-NAS models predicted the isotherms much better than the Extended Langmuir-Freundlich did. The analysis of the IH-SPD-NAS model indicated that the small positive deviations from Raoult’s law were generally exhibited in CFC-12, while the moderate positive deviations from Raoult’s law occurred in the dilute region of HFC-32(YCFC→1.0). However, the nonideality in the adsorbed phase can be negligible under these experimental conditions.
Keywords
References
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Chen YD, Ritter JA, Yang RT, AIChE J., 45, 2877 (1990)
Cochran TW, Kabcl RL, Danner RP, AIChE J., 31, 268 (1985)
Costa E, Sotelo JL, Calleja G, Marron C, AIChE J., 27, 5 (1981)
Golden TC, Sircar S, AIChE J., 40(6), 935 (1994)
Hoory SE, Prausnitz JM, Chem. Eng. Sci., 22, 1025 (1967)
Hori H, Tanaka I, Akiyama T, J. Chem. Soc., 9, 1241 (1986)
IMSL MATH/LIBRARY, FORTRAN subroutine for mathematical applications ver. 1.1 User's Manual, IMSL Inc. (1989)
Kodama KS, Kaguei S, Wakao N, Can. J. Chem. Eng., 70, 244 (1992)
Kumar R, Can. J. Chem. Eng., 60, 577 (1982)
Loughlin KF, Hasanain MA, Abdul-Rehman HB, Ind. Eng. Chem. Res., 29, 1535 (1990)
Mahle JJ, Buettner LC, Friday DK, Ind. Eng. Chem. Res., 33(2), 346 (1994)
Miller GW, Knaebel KS, Ikels KG, AIChE J., 33, 194 (1987)
Molina MJ, Rowland FS, Nature, 249, 810 (1974)
Myers AL, "Adsorption of Pure Gases and Their Mixture on Heterogeneous Surfaces," Fundamentals of Adsorption (Myers, A.L. and Belfort, G. Ed.), Eng. Foundation, New York, 365 (1984)
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Myers AL, "Theories of Adsorption in Micropores," Proc. Nato ASI: Adsorption Science and Technology, Portugal (1988)
Myers AL, Prausnitz JM, AIChE J., 11, 121 (1965)
Ross S, Olivier JP, "On Physical Adsorption," Interscience, New York (1964)
Ruthven DM, "Principles of Adsorption & Adsorption Processes," John Wiley & Sons, New York (1984)
Sloan ED, Mullins JC, Ind. Eng. Chem. Fundam., 14, 347 (1975)
Suwanayuen S, Danner RP, AIChE J., 31, 2075 (1980)
Talu O, Myers AL, AIChE J., 34, 1887 (1988)
Talu O, Zwiebel I, AIChE J., 32, 1263 (1986)
Talu O, Li J, Myers AL, Adsorption, 1, 103 (1995)
Valenzuela DP, Myers AL, AIChE J., 34(3), 397 (1988)
Wilson GM, J. Am. Chem. Soc., 86, 127 (1964)
Yang RT, "Gas Separation by Adsorption Processes," Butterworths, Boston (1987)
Park JH, Jun JH, Hwang KS, Lee WK, HWAHAK KONGHAK, 33(3), 301 (1995)
Ahn BS, Lee SC, Park KY, Chem. Ind. Technol., 12(3), 255 (1994)
이한주, "기체분리를 위한 흡착공정," 지구문화사 (1993)
Lim JG, Chang WC, Lee TJ, Shim JJ, Choi DK, Lee YY, HWAHAK KONGHAK, 32(3), 341 (1994)
