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Organic Vapor Recovery and Energy Efficiency during Electric Regeneration of an Activated Carbon Fiber Cloth Adsorber |
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| Authors: | Katherine D. Dombrowski Christopher M. B. Lehmann Patrick D. Sullivan David Ramirez Mark J. Rood K. James Hay |
| Affiliation: | 1Engineer, URS Corporation, 9400 Amberglen Blvd., Austin, TX?78729 (corresponding author); formerly, MS Student, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, 205 N. Mathews Ave., Urbana, IL?61801. 2PhD Student, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, 205 N. Mathews Ave., Urbana, IL?61801. 3Environmental Engineer, Air Force Research Laboratory, AFRL/MLQF, 139 Barnes Dr., Suite 2, Tyndall AFB, FL?32403-5323. 4Professor, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, 205 N. Mathews Ave., Urbana, IL?61801 (corresponding author). 5Environmental Engineer, Construction Engineering Research Lab, U.S. Army Corps of Engineers, 2902 Newmark Drive, P.O. Box 9005, Champaign, IL?61826. |
| Abstract: | An electrothermal-swing adsorption system was demonstrated on the bench scale for capture and recovery of organic vapors from air streams. Methyl propyl ketone (MPK), methyl ethyl ketone, n-hexane, acetone, and methylene chloride were removed and recovered at 200–1,020?ppmv in a 40.0 slpm air stream while using activated carbon fiber cloth (ACFC) adsorbent. Removal efficiencies were greater than 99.9%. Liquid recovery fractions increased with increasing relative pressure, ranging from 0.11 for methylene chloride (P/Psat = 2.1×10?3) to greater than 0.80 for MPK (P/Psat = 2.2×10?2). The electrical energy consumed during regeneration per mol of liquid organic compound recovered decreased with increasing relative pressure of the inlet gas stream, ranging from 4,698 kJ/mol for methylene chloride to 327 kJ/mol for MPK. Equilibrium ACFC adsorption capacity, throughput ratio, and length of unused bed were also evaluated. These results are encouraging for the development of a new technology to capture and readily recover a wide range of organic vapors from air streams. |
| Keywords: | Adsorption Activated carbon Regeneration Chlorides Volatile organic chemicals Air pollution |