Abstract
The zero length column (ZLC) method has been applied to study the adsorption and diffusion of CO2 in a carbon monolith adsorbent. ZLC desorption curves, measured over a wide range of flow rates, are shown to be very well accounted for assuming a linear equilibrium isotherm with the kinetics controlled by diffusion into a parallel sided slab. The data, at all flow rates, are characterized by a single pair of parameters (K and D s). Diffusivities for a He carrier are about double those for a N2 carrier reflecting both the difference in molecular diffusivities and some contribution from Knudsen diffusion. Breakthrough curves for CO2-He and CO2-N2 were also measured for columns packed with the monolith adsorbent. Both the equilibrium and diffusion parameters derived from analysis of the breakthrough curves in accordance with the Golay/Spangler models are consistent with the values derived from the ZLC measurements. Dispersion in the monoliths is shown to be controlled by mass transfer resistance rather than axial mixing.
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References
Ammons, R.D., N.A. Dougherty, and J.M. Smith, Ind. Eng. Chem. Fund., 16, 363 (1977).
Brandani, F., S. Brandani, C.G. Coe, and D.M. Ruthven, “Measurement of Henry Constants and Equilibrium Isotherms by the ZLC Technique,” in Fundamentals of Adsorption 7, K. Kaneko, H. Kanoh, and Y. Hanzawa (Eds.), pp. 21-28, International Adsorption Society, I.K. International, Chiba Japan 2002.
Brandani, S., D.M. Ruthven, and J. Kärger, “Concentration Dependence of Self-Diffusivity of Methanol in NaX Zeolite Crystals,” Zeolites, 15, 494-495 (1995).
Eic, M. and D.M. Ruthven, “Intracrystalline Diffusion of Linear Paraffins and Benzene in Silicalite Studied by ZLC,” in Zeolites Facts, Figures, Future, P.A. Jacobs and R.A. van Santen (Eds.), pp. 897-905, Elsevier, Amsterdam 1989.
Golay, M.J. “Theory of Chromatography in Open and CoatedTubular Columns,” in Gas Chromatography, D.H. Desty (Ed.), pp. 36-55 Academic Press, New York, 1958.
Kärger, J. and D.M. Ruthven, “Diffusion in Zeolites and other Microporous Solids,” p. 299, John Wiley, New York, 1992.
Park, M., F.R. Rhodes, J.H. L'Amoreux, F.S. Baker, R.H. Beckler, and J.C. McCue, U.S. Patents 6,171,373, Jan. 9th 2001, and 6,284,705, Sept. 4th, 2001 to Westvaco Inc.
Ruthven, D.M., “Past Progress and Future Challenges in Adsorption Research,” Ind. Eng. Chem. Res., 39, 2127-2131 (2000).
Ruthven, D.M. and S. Brandani, “Measurement of Diffusion in Porous Solids by Zero Length Column (ZLC) Methods” in Recent Advances in Gas Separation by Microporous Ceramic Membranes, N.K. Kanellopoulos (Ed.), pp. 187-212, Elsevier, Amsterdam, 2000.
Ruthven, D.M. and C. Thaeron, “Performance of a Parallel Passage Adsorbent Contactor,” Gas Sep. Purif., 10, 63-73 (1996).
Spangler, G.E., “HETP Theory for Rectangular G.C. Columns,” Anal. Chem., 70, 4805-4816 (1998).
Spangler, G.E. “Relationships for Modelling Performance of Rectangular Gas Chromatographic Columns,” J. Microcolumn Seps., 13, 285-292 (2001).
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Brandani, F., Rouse, A., Brandani, S. et al. Adsorption Kinetics and Dynamic Behavior of a Carbon Monolith. Adsorption 10, 99–109 (2004). https://doi.org/10.1023/B:ADSO.0000039866.37214.6a
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DOI: https://doi.org/10.1023/B:ADSO.0000039866.37214.6a