Adsorption Isotherms of VOCs onto an Activated Carbon Monolith: Experimental Measurement and Correlation with Different Models
15 Mar 2002-Journal of Chemical & Engineering Data (American Chemical Society)-Vol. 47, Iss: 3, pp 467-473
TL;DR: A new material, activated carbon monolith, can be used as an adsorbent to remove volatile organic compounds (VOCs) as discussed by the authors, which can be applied to remove VOCs.
Abstract: A new material, activated carbon monolith, can be used as an adsorbent to remove volatile organic compounds (VOCs). Vapor−solid adsorption isotherms of three VOCs (toluene, 1-butanol, and ethyl ace...
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TL;DR: This review discusses recent research developments of VOC adsorption onto a variety of engineered carbonaceous adsorbents, including activated carbon, biochar, activated carbon fiber, carbon nanotube, graphene and its derivatives, carbon-silica composites, ordered mesoporous carbon, etc.
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TL;DR: In this paper, novel structured adsorbents for gas separation processes are discussed and general requirements are elucidated and illustrated with respect to specific structures such as monoliths, foams, laminates, and fabric structures.
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TL;DR: In this article, the performance of different types of adsorbents, such as monolithic, laminate and foam structures, compared to a packed bed of pellets was evaluated and compared with a PSA process.
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Cites methods from "Adsorption Isotherms of VOCs onto a..."
...Parallel channel monolithic structures with controllable shape, cell density and wall thickness have been reported for their use in adsorptive gas separation systems (Kodama et al., 1993; Gadkaree, 1997; Li et al., 1998; Lee et al., 2000; Yu et al., 2002; Yates et al., ∗ Corresponding author....
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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 five-step temperature vacuum swing adsorption process for direct air capture using solid adsorbents coated as films on monolithic contactors using steam as the stripping agent during desorption is proposed.
Abstract: Direct air capture (DAC) removes CO2 from the atmosphere and can therefore address sizable nonpoint sources emissions of CO2 such as those from transportation. We propose a five-step temperature vacuum swing adsorption process for direct air capture using solid adsorbents coated as films on monolithic contactors using steam as the stripping agent during desorption. We perform a modeling study and economic assessment for DAC using two metal organic frameworks, MIL-101(Cr)-PEI-800 and mmen-Mg2(dobpdc), for which we have experimentally demonstrated film growth on monolith structures. The results indicate minimum energy requirements, and cost estimates are 0.145 MJ/mol-CO2 and $75–140/t-CO2 for MIL-101(Cr)-PEI-800, and 0.113 MJ/mol-CO2 and $60–190/t-CO2 for mmen-Mg2(dobpdc), respectively. The overall DAC cost is sensitive to adsorbent purchase cost and lifetime as well as cycle parameters such as adsorption and desorption times. We conclude that mmen-Mg2(dobpdc) has better performance compared to MIL-101(Cr)-...
130 citations
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01 Sep 1998
826 citations
TL;DR: In this paper, a number of equilibrium isotherm models can be used for correlating experimental equilibrium results, including the ideal adsorbed solution theory (OASSP) model.
Abstract: A number of equilibrium isotherm models can be utilized for correlating experimental equilibrium results. Seven different isotherm models are studied using equilibrium data of methane, ethane and propane in activated carbon. Besides comparing the goodness of data fit, the limiting behaviors as well as the pressure and temperature derivatives of the equilibrium isotherm models are also investigated. Performance of multicomponent extensions of these isotherm models and their combinations with the ideal adsorbed solution theory are also compared with experimental data. This systematic evaluation of the more important equilibrium isotherm models provides the general basis for making a preliminary selection of an effective model for a given application. Although an accurate and thermodynamically consistent model is desirable, these requirements may often be compromised for computational simplicity in dynamic process modeling studies.
211 citations
TL;DR: In this paper, the authors investigated bubble formation with weeping at a submerged orifice over a range of orifice diameters of 3-13.2 mm and obtained empirical relationships predicting each transitional point of bubble formation regimes.
Abstract: Bubble formation phenomena with weeping at a submerged orifice were investigated experimentally over a range of orifice diameters of 3-13.2 mm. There appeared to be four regimes of interest: single bubbling at small chamber volumes and low gas flow rates, doubling noticed with increasing gas flow rate, jetting at further increase of gas flow rate and pairing at very large chamber volumes under conditions of gas flow rates smaller than those for jetting point. Empirical relationships predicting each transitional point of bubble formation regimes are obtained.
29 citations
TL;DR: In this article, a multi-site occupancy model for homogeneous surface represents the isotherms fairly well, but the calculated amounts of adsorption are usually less than those observed at low surface coverage.
Abstract: Equilibrium data for single-component adsorption on activated fiber carbon, KF-1500 are presented for the five gases methane, ethane, propylene, 1-pentane and carbon dioxide at 0, 25 and 50 °C. An adsorption equation by a multi-site occupancy model for homogeneous surface represents the isotherms fairly well, but the calculated amounts of adsorption are usually less than those observed at low surface coverage. The deviation may be attributed to the surface heterogeneity, which is neglected in the equation. From a comparison of isotherms on glanular and fiber activated carbons, it is suggested that the difference is only in the specific surface area, and that the other two parameters, the number of sites occupied by a molecule and the adsorption equilibrium constant, are almost the same for the two activated carbons.
20 citations