Adsorption of 1,1,1,2-Tetrafluoroethane by Various Adsorbents
Publication: Journal of Environmental Engineering
Volume 125, Issue 11
Abstract
Experiments have been conducted to investigate gas-phase adsorption characteristics of 1,1,1,2-tetrafluoroethane (HFC-134a) by activated carbon fiber, extruded activated carbon, granular activated carbon, activated alumina, and molecular sieve. HFC-134a is currently regarded as an excellent replacement for chlorofluorocarbon-12, a refrigerating and cooling agent extensively used previously in all automobiles and many cooling systems. Performances of HFC-134a adsorption were characterized by the equilibrium adsorption capacity, time to reach equilibrium, and desorption efficiency of exhausted adsorbent. A simple thermal treatment process with proper operating temperature and treatment duration was found to be effective for the regeneration of exhausted adsorbents. Adsorption isotherms of the empirical Freundlich and Jossens types were observed to adequately represent the equilibrium adsorption data. A mass transfer model based on the pseudo steady state squared driving force was adopted to describe the mass transfer process of HFC-134a adsorption.
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Information & Authors
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Published In
Journal of Environmental Engineering
Volume 125 • Issue 11 • November 1999
Pages: 1048 - 1053
History
Received: Mar 13, 1998
Published online: Nov 1, 1999
Published in print: Nov 1999
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