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성형 제올라이트 4A 및 5A에 대한 N2의 흡착속도
Sorption Kinetics of N2 on Pelletized Zeolite 4A and 5A
HWAHAK KONGHAK, June 1999, 37(3), 364-372(9), NONE
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Abstract
273-303K와 0-0.8atm의 범위에서 중량법을 이용하여 성형 제올라이트 4A와 5A에 대한 N2의 흡착속도 및 평형특성을 연구하였다. N2/4A계의 확산속도는 미세공확산에 의해 결정되었으며, 실험압력 내에서 미세공확산시간상수가 농도에 무관한 경향을 나타내었다. N2/4A계에서의 미세공확산속도와 확산활성화에너지는 흡착질의 분자크기와 미세공크기의 비로 설명이 가능하였다. 그러나 N2/5A계는 대기공확산이 흡착속도에 상당한 영향을 주었다. N2/5A계의 유효대기공화산계수는 압력에 따라 완만하게 증가하는 경향을 나타내었으며, 평균대기공확산계수, 공극률과 흡착등온선의 기울기를 이용하여 잘 예측되었다. N2/4A와 N2/5A계 모두에서 흡착열에 의한 외부열전달의 영향이 중요하게 나타났다. 이러한 비등온계의 외부열전달속도는 흡착제 성질에는 무관한 경향을 보였으며, 흡착질의 열적 성질에 의존하였다.
The sorption kinetics and equilibria of N2 in pelletized zeolite 4A and 5A by the gravimetric method were studied theoretically and experimentally at the range of 273-303 K and 0-0.8 atm. The diffusion rate of N2/4A system was determined by micropore diffusion. The micropore diffusion time constants of N2/4A system showed no significant concentration dependence. The micropore diffusion rate and diffusional activation energy in N2/4A system could be explained by the ratio of adsorbate kinetic diameter to micropore diameter. On the other hand, the diffusion rate of N2/5A system was significantly affected by macropore diffusion. The effective macrpore diffusivity of N2/5A system was increased moderately with sorbate pressure and was well predicted by using average macropore diffusivities, porosities, and slopes of isotherm. The effects of external film heat transfer by heat of adsorption were significant for N2/4A and N2/5A systems. The rates of external film heat transfer depended not on the adsorbent, but on the thermal properties of the adsorbate.
Keywords
References
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Ruthven DM, Sepa. Tech., 11, 1 (1994)
Ruthven DM, Farooq S, Knaebel KS, "Pressure Swing Adsorption," VCH Press (1994)
Chen NY, Degan TF, Smith CM, "Molecular Transport and Reaction in Zeolites," VCH Press (1994)
Song DI, HWAHAK KONGHAK, 33(3), 328 (1995)
Xiao J, Wei J, Chem. Eng. Sci., 47, 1123 (1992)
Xiao J, Wei J, Chem. Eng. Sci., 47, 1143 (1992)
Ruthven DM, Lee LK, Yucel H, AIChE J., 26, 16 (1980)
Ruthven DM, Lee Lk, Yucel H, AIChE J., 27, 654 (1981)
Ross RC, Olivier JP, "On Physical Adsorption," Interscience (1964)
Brunovska A, Ilavsky J, Hlavacek V, Chem. Eng. Sci., 36, 123 (1981)
Lee LK, Ruthven DM, J. Chem. Soc.-Faraday Trans., 175, 2406 (1979)
Suzuki M, "Adsorption Engineering," Elsevier (1990)
Stonage PR, Benham MJ, Ross DK, Sepa. Tech., 11, 129 (1994)
Riggs JB, "An Introduction to Numerical Methods for Chemical Engineers," 2th Ed., Texas Tech. University Press (1994)
IMSL MATH/LIBRARY, FORTRAN subroutine for mathematical applications ver 1.1 User's Manual, IMSL Inc. (1989)
Yang RT, "Gas Separation by Adsorption Processes," Butterworths (1987)
Ahn HW, Park MK, Park DS, Lee CH, HWAHAK KONGHAK, 36(2), 169 (1998)
Breck DW, "Zeolite Molecular Sieves," John Wiley & Sons (1974)
Bird RB, Stewart WE, Lightfoot ED, "Transport Phenomena," John Wiley and Sons (1960)
Ruthven DM, "Principles of Adsorption and Adsorption Processes," John Wiley & Sons (1984)
Barrer RM, "Zeolites and Clay Minerals as Sorbents and Molecular Sieves," Academic Press (1978)
Miller JW, Shah PN, Yaws CL, Chem. Eng., 83, 153 (1976)
Reid RC, Prausnitz JM, Poling BE, "The Properties of Gases & Liquids," 4th Ed., McGraw-Hill (1987)
Atkins PW, "Physical Chemistry," 4th Ed., Oxford (1990)
Perry RH, Green D, "Perry's Chemical Engineers' Handbook," 6th Ed., McGraw-Hill (1984)
Lee CH, Yang J, Kim CW, Cho CH, Lee HJ, HWAHAK KONGHAK, 35(1), 69 (1997)
