Electrothermal swing adsorption of toluene on an activated carbon monolith - Experiments and parametric theoretical study
TL;DR: In this article, the authors investigated the electrothermal swing adsorption (ESA) process with an activated carbon monolith as adsorbent, and found that the performance of the process is strongly dependent on the operating conditions.
Abstract: The purpose of the present work is to investigate electrothermal swing adsorption (ESA) process with an activated carbon monolith as adsorbent. Experiments are performed with toluene as VOC. Several parameters are investigated both experimentally and through a mathematical model. It is shown that the monolith, as a carbon material, behaves as a semi-conductor. Its resistivity decreases as temperature and amount adsorbed increase. This leads to different types of evolution of dissipated electrical power during desorption at constant current intensity. The concentration of the desorbed VOC as a function of time has the shape of a peak followed by a tail. This shape is interpreted as a dispersive wave in the sense of the equilibrium theory of adsorption columns. The performance of the process is strongly dependent on the operating conditions. The maximal (that is initial) concentration increases almost linearly with current intensity and purge gas flow rate, and increases also with preheating duration. The purge gas flow rate has mainly an effect of dilution. The efficiency of desorption (% VOC desorbed) is almost constant in average with different preheating times. It increases with current intensity and gas purge flow rate.
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TL;DR: In this article, more than 300 scientific sources are reviewed with a view to developing an exhaustive collection and description of all such methods, and a series of criteria to classify existing methods (as well as any method that may be proposed in the future).
177 citations
TL;DR: The ACC were also electrically conductive and showed potential for regeneration by the Joule effect, as determined from macroscopic electrical measurements before and after n-hexane adsorption.
132 citations
TL;DR: In this paper, a comparison of different methods of desorption by heating, purge and/or vacuum is performed with a 5A zeolite on a small laboratory column with heating from the wall.
130 citations
TL;DR: In this paper, an activated carbon honeycomb monolith with low electrical resistivity was employed as selective adsorbent for carbon capture for low molar fractions of CO2 in the flue gas streams.
121 citations
TL;DR: In this paper, the authors present progress made in CO2 capture by electrothermal swing adsorption (ESA) with activated carbon fiber materials and suggest future research directions in CO 2 capture by Electrothermal Swing Adsorption.
110 citations
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01 Apr 1987
TL;DR: In this article, the authors present an analysis of gas mixtures rate processes in adsorbers adsorber dynamics, bed profiles and breakthrough curves cyclic gas separation processes and pressure-swing adsorption.
Abstract: Adsorbents and adsorption isotherms equilibrium adsorption of gas mixtures rate processes in adsorbers adsorber dynamics - bed profiles and breakthrough curves cyclic gas separation processes pressure-swing adsorption - principles and processes pressure-swing adsorption - models and experiments.
1,814 citations
823 citations
TL;DR: 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.
Abstract: 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 lower temperatures. Energy and material balances for the electrothermal desorption of organic vapors and ACFC agree to within 7% of experimentally measured values. 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.
89 citations
TL;DR: In this paper, the electrical resistance of activated carbon cloth is measured using the intrinsic characteristics of various fabrics and to the temperature reached at the surface of the material, which is a relevant parameter to characterize these materials.
87 citations
TL;DR: In this article, pressure swing adsorption (PSA) air purification/vapor recovery was studied by experiments and model simulations using dimethyl methylphosphonate (DMMP) vapor and activated carbon.
Abstract: Pressure swing adsorption (PSA) air purification/vapor recovery was studied by experiments and model simulations using dimethyl methylphosphonate (DMMP) vapor and activated carbon
74 citations