Articles & Issues
- Language
- English
- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
-
Received June 18, 2003
Accepted September 10, 2003
-
This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright © KIChE. All rights reserved.
All issues
A Unique Behavior of Sub-critical Hydrocarbon Permeability in Activated Carbon at Low Pressures
Division of Chemical Engineering, University of Queensland, St. Lucia, Qld 4072, Australia
duongd@cheque.uq.edu.au
Korean Journal of Chemical Engineering, November 2003, 20(6), 1097-1102(6), 10.1007/BF02706943
Download PDF
Abstract
In our study on sub-critical hydrocarbon permeation in activated carbon, a minimum in the total permeability (BT) at low pressure has been observed for only long-chain hydrocarbons such as n-hexane and n-heptane. Such an observation suggests that the minimum appearance depends on the properties of permeating vapors as well as the porous medium. In this paper a permeation model is presented to explain the minimum behavior with the allowance of the collision-reflection factor in the Knudsen diffusivity to be a function of surface loading. Surface diffusion was found to be very significant compared to other transport mechanisms such as Knudsen diffusion and gaseous viscous flow at low pressures. Since the gaseous viscous flow contributes negligibly to the BT at low pressures, the minimum appearance in the BT is mainly attributed to the interplay between Knudsen diffusion and surface diffusion. Also, the molecular structure of adsorbates plays an important role in the minimum appearance.
References
Adzumi H, Bull. Chem. Soc. Jpn., 12(6), 292 (1937)
Bae JS, Do DD, Chem. Eng. Sci., 57(15), 3013 (2002)
Carman PC, Proc. Roy. Soc., A203, 55 (1950)
Do DD, Chem. Eng. Sci., 50(3), 549 (1995)
Do DD, Chem. Eng. Sci., 51(17), 4145 (1996)
Do HD, Do DD, Chem. Eng. J., 84(3), 295 (2001)
Do HD, Do DD, Prasetyo I, AIChE J., 47(11), 2515 (2001)
Knudsen M, Annalen Physik, 28, 75 (1909)
Mayfield P, Do DD, Ind. Eng. Chem. Res., 30, 1262 (1991)
Moon H, Park HC, Lee WK, Korean J. Chem. Eng., 7(4), 250 (1990)
Pollard WG, Present RD, Phys. Rev., 73(7), 762 (1948)
Prasetyo I, "Kinetics Characterization of Hydrocarbons on Activated Carbon with New Constant Molar Flow and Differential Permeation Techniques," Ph.D., The University of Queensland, Brisbane, Australia (2000)
Schneider P, Smith J, AIChE J., 14, 762 (1968)
Wicke E, Vollmer W, Chem. Eng. Sci., 1, 282 (1952)
Yasuda Y, J. Phys. Chem., 86, 1913 (1982)
Bae JS, Do DD, Chem. Eng. Sci., 57(15), 3013 (2002)
Carman PC, Proc. Roy. Soc., A203, 55 (1950)
Do DD, Chem. Eng. Sci., 50(3), 549 (1995)
Do DD, Chem. Eng. Sci., 51(17), 4145 (1996)
Do HD, Do DD, Chem. Eng. J., 84(3), 295 (2001)
Do HD, Do DD, Prasetyo I, AIChE J., 47(11), 2515 (2001)
Knudsen M, Annalen Physik, 28, 75 (1909)
Mayfield P, Do DD, Ind. Eng. Chem. Res., 30, 1262 (1991)
Moon H, Park HC, Lee WK, Korean J. Chem. Eng., 7(4), 250 (1990)
Pollard WG, Present RD, Phys. Rev., 73(7), 762 (1948)
Prasetyo I, "Kinetics Characterization of Hydrocarbons on Activated Carbon with New Constant Molar Flow and Differential Permeation Techniques," Ph.D., The University of Queensland, Brisbane, Australia (2000)
Schneider P, Smith J, AIChE J., 14, 762 (1968)
Wicke E, Vollmer W, Chem. Eng. Sci., 1, 282 (1952)
Yasuda Y, J. Phys. Chem., 86, 1913 (1982)
