Visualization of the exothermal VOC adsorption in a fixed-bed activated carbon adsorber

Cloirec, Pierre Le; Pré, Pascaline; Delâge, Frédéric; Giraudet, Sylvain

doi:10.1080/09593330.2011.571713

Cited by 16 publications

(6 citation statements)

References 24 publications

(29 reference statements)

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“…The choice of these materials rather than activated carbon is mainly due to the exothermic phenomenon associated with values of VOC adsorption enthalpy, usually ranging between 40 and 90 kJ.mol −1 [4,14]. This can yield to high temperature increases depending on levels of treated VOC concentration and may induce significant local warming to start combustion of either the adsorbate or the adsorbent itself, particularly if activated carbon is used [15,16]. Thus additional consideration of safety conditions is required for appropriate engineering and safe operating of adsorption facilities, which in turn needs accurate knowledge of the evolved heat effect values.…”

Section: Introductionmentioning

confidence: 99%

Non-Calorimetric Determination of the Adsorption Heat of Volatile Organic Compounds under Dynamic Conditions

et al. 2015

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Avoiding strong chemical bonding, as indicated by lower heat of adsorption value, is among the selection criteria for Volatile Organic Compounds adsorbents. In this work, we highlight a non-calorimetric approach to estimating the energy of adsorption and desorption based on measurement of involved amounts, under dynamic conditions, with gaseous Fourier Transform Infrared spectroscopy. The collected data were used for obtaining adsorption heat values through the application of three different methods, namely, isosteric, temperature programmed desorption (TPD), and temperature-programmed adsorption equilibrium (TPAE). The resulting values were compared and discussed with the scope of turning determination of the heat of adsorption with non-calorimetric methods into a relevant decision making tool for designing cost-effective and safe operating of adsorption facilities.

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Section: Introductionmentioning

confidence: 99%

Non-Calorimetric Determination of the Adsorption Heat of Volatile Organic Compounds under Dynamic Conditions

et al. 2015

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“…For this purpose, infrared thermography was used 36 and confirmed that the temperature at the filter center was representative of all temperatures, as illustrated in Figure 4. In fact, when the temperatures were plotted along the horizontal and vertical lines, deviations below 10% were obtained.…”

Section: Resultsmentioning

confidence: 99%

Adsorption and Electrothermal Desorption of Volatile Organic Compounds and Siloxanes onto an Activated Carbon Fiber Cloth for Biogas Purification

2014

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Although biogases mainly consist of a mixture of carbon dioxide and methane, traces of volatile organic compounds are present, and these undesirable compounds must be removed during the purification process. Adsorption onto an activated carbon fiber cloth (ACFC) was investigated and, in particular, the feasibility of electrothermal desorption. Five compounds were chosen, and their desorption was assessed by monitoring the electric resistance of the material as a function of the temperature. The results were confirmed by thermogravimetric analysis. Toluene, dichloromethane, and isopropanol were entirely desorbed at 420 K, whereas siloxane D4 and ethyl mercaptan (ethanethiol) were partially removed. These conclusions were confirmed by dynamic adsorption measurements. Cycles of adsorption followed by electrothermal desorption were first carried out for a single component (toluene). Although there was a loss of adsorption capacity between the first and second cycles, a steady performance was reached, shedding light on the complete reversibility of the adsorption of toluene. On the contrary, for the mixture of five organic compounds, a constant loss of adsorption capacity was measured after 3 cycles, which was attributed to the incomplete regeneration at 420 K of two organic compounds (ethanethiol and siloxane D4) from the ACFC from one cycle to another. The electrical consumption for the electrothermal desorption was highest at the beginning of the desorption and rapidly decreased as the temperature within the filter reached its set point. An average consumption was estimated at 1500 W kg −1 of activated carbon fiber cloth.

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“…The applications of such a study are as follows: Processes involving fluid–solid interactions with applications for water and air treatments . In other words, adsorption–desorption processes are implemented, studied, and optimized in the case of complex media. Technological diffusion on applications such as the treatment of volatile organic compounds present in the air and the purification of organic or metallic micropollutions in the water. …”

Section: Introductionmentioning

confidence: 99%

“…• Technological diffusion on applications such as the treatment of volatile organic compounds present in the air and the purification of organic 6 or metallic micropollutions in the water.…”

Section: Introductionmentioning

confidence: 99%

Study of the adsorbate–adsorbent interaction potential: Ethanol‐activated carbon AC35

Benkahla

Mhiri

2019

Env Prog and Sustain Energy

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In this study, a mathematical model of the adsorbate–adsorbent interaction potential as a function of the pore radius in the case of the adsorption of a gas by a microporous solid is proposed. The suggested mathematical model is based on the flow concept: the flow of the quantity of adsorbed material is proportional to the variation of the potential. The experimental study of the flow enabled us to determine the expression of the variation of the potential, and through integration, to state the expression of the latter. The experimental curve of the flux as a function of the pore radius includes a point of inflection. Mathematically, this type of curve is described by two equations. One corresponds to the adsorption in micropores and mesopores [r0 < r ≤ r2], whereas the other corresponds to the adsorption by macropores and the lateral surface of the activated carbon grain AC35 [r2 ≤ r]. This implies the existence of two types of interaction forces between the adsorbate molecules and the adsorbent. This study confirms the concordance of the two adsorption models (Dubinin–Astakov and Brunauer–Emmett–Teller) with the experiment. In addition, the proposed mathematical model will allow to perform quantification studies of the energy that is exchanged during adsorption.

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Visualization of the exothermal VOC adsorption in a fixed-bed activated carbon adsorber

Cited by 16 publications

References 24 publications

Non-Calorimetric Determination of the Adsorption Heat of Volatile Organic Compounds under Dynamic Conditions

Non-Calorimetric Determination of the Adsorption Heat of Volatile Organic Compounds under Dynamic Conditions

Adsorption and Electrothermal Desorption of Volatile Organic Compounds and Siloxanes onto an Activated Carbon Fiber Cloth for Biogas Purification

Study of the adsorbate–adsorbent interaction potential: Ethanol‐activated carbon AC35

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