Organic Vapor Recovery and Energy Efficiency during Electric Regeneration of an Activated Carbon Fiber Cloth Adsorber

Dombrowski, Katherine; Lehmann, Christopher; Sullivan, Patrick; Ramirez, David; Rood, Mark J.; Hay, K. James

doi:10.1061/(asce)0733-9372(2004)130:3(268)

Cited by 27 publications

(26 citation statements)

References 11 publications

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“…The removal efficiencies were greater than 99.9% (Dombrowski et al, 2004). In addition, the effects of the adsorbate polarity on the adsorption capacity at lower concentrations were found to be more significant.…”

Section: Adsorptionmentioning

confidence: 86%

Review of research on air-conditioning systems and indoor air quality control for human health

Liu

et al. 2009

International Journal of Refrigeration

344

132

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Section: Adsorptionmentioning

confidence: 86%

Review of research on air-conditioning systems and indoor air quality control for human health

Liu

et al. 2009

International Journal of Refrigeration

344

132

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“…The electro-thermal regeneration method has been explored in a number of studies to obtain optimal loading and regeneration conditions for ACF fiber systems (Yao et al, 2009, Sullivan et al, 2001, Dombrowski et al, 2004. These studies utilized a single VOC at different concentrations.…”

Section: Adsorption -Regeneration Cycles: Methods 2-regeneration With mentioning

confidence: 99%

Energy efficient indoor VOC air cleaning with activated carbon fiber (ACF) filters

Sidheswaran

Destaillats

Sullivan

et al. 2012

Building and Environment

171

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This study explores the potential environmental and energy benefits of using activated carbon fiber (ACF) filters for air cleaning in HVAC systems. The parallel aims for the air cleaning system were to enable reduced indoor exposures to volatile organic compounds (VOCs) and to simultaneously allow reduced rates and energy consumption for outdoor-air ventilation. We evaluated the use of ACF media to adsorb VOCs from indoor air during repeated simulated 12-hour to 24-hour periods of occupancy. In a cyclic regeneration process, VOCs were desorbed from the ACF media and vented outdoors to enable the next cycle of air cleaning. The VOC removal efficiency of the ACF media was measured using a 9.5-cm 2 ACF specimen exposed to a mixture of VOCs that included toluene, benzene, o-xylene, 1-butanol, limonene, undecane and formaldehyde at 29 o C and 30% relative humidity. The concentrations of these model pollutants upstream of the ACF media were in the range 20 to 30 ppb, to simulate realistic conditions.Velocities through the ACF media were typical of those in normal particle filter systems (~0.5 m

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“…Desorption of acetone at lower power levels resulted in lower recovery (by 40%) than that predicted by the model. Desorption of methylene chloride resulted in ~10% condensate recovery of the adsorbed mass, and rapid venting of excess vapor from the vessel was observed (23). Auxiliary cooling of low flow rate effluent from the adsorber may be needed for compounds with saturation vapor pressures > 0.2 atm at 20 °C.…”

Section: Resultsmentioning

confidence: 99%

Activated Carbon Fiber Cloth Electrothermal Swing Adsorption System

Sullivan

Rood

Grévillot³

et al. 2004

Environ. Sci. Technol.

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The Dublic reDortinp burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, ^*|5^^*'™?* gatheringand maintairfng thedata needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate|_or any^e; a_spe«jrfJhis^tectonrt information, including suggestions for reducii ?n?ÄlnTl™ "^Jefferson Davfc Highway! Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be sublet to anpenalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY) ARMT0052 PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)University of Illinois SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Air Force Capture and recovery of hazardous air pollutants (HAPs) and volatile organic compounds (VOCs) from gas streams using physical adsorption onto activated carbon fiber cloth (ACFC) is demonstrated on the bench-scale. This system is regenerated electrothermally, by passing an electric current directly through the ACFC. The adsorbate desorbs from the ACFC, rapidly condenses on the inside walls of the adsorber, and then drains from the adsorber as a pure liquid. Rapid electrothermal desorption exhibits such unique characteristics as extremely low purge gas flow rate, rapid rate of ADFC heating, rapid mass transfer kinetics inherent to ACFC, and in-vessel condensation. An existing system was scaled up 500%, and the new system was modeled using material and energy balances.... These results allow the modeling of electrothermal desorption of organic vapors from gas streams with in-vessel condensation to optimize operating conditions of the system during regeneration of the adsorbent. Environ. Sei. Technol. 2004, 38, 4865-4877 Capture and recovery of hazardous air pollutants (HAPs) and volatile organic compounds (VOCs) from gas streams using physical adsorption onto activated carbon fiber cloth (ACFC) is demonstrated on the bench-scale. This system is regenerated electrothermally, by passing an electric current directly through the ACFC. The adsorbate desorbs from the ACFC, rapidly condenses on the inside walls of the adsorber, and then drains from the adsorber as a pure liquid. Rapid electrothermal desorption exhibits such unique characteristics as extremely low purge gas flow rate, rapid rate of ACFC heating, rapid mass transfer kinetics inherent to ACFC, and in-vessel condensation. An existing system was scaled up 500%, and the new system was modeled using material and energy balances. Adsorption isotherms using methyl ethyl ketone (MEK) and ACFC were obtained while electricity passed through the ACFC and at temperatures above MEK's boiling point. These isotherms agreed within 7% to Dubinin-Radushkevich modeled isotherms that were extrapolated from independently determined gravimetric measurements obtained at l...

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Organic Vapor Recovery and Energy Efficiency during Electric Regeneration of an Activated Carbon Fiber Cloth Adsorber

Cited by 27 publications

References 11 publications

Review of research on air-conditioning systems and indoor air quality control for human health

Review of research on air-conditioning systems and indoor air quality control for human health

Energy efficient indoor VOC air cleaning with activated carbon fiber (ACF) filters

Activated Carbon Fiber Cloth Electrothermal Swing Adsorption System

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