Theoretical and experimental studies of the recovery of volatile organic compounds from waste air streams in the thermal swing adsorption system with closed-loop regeneration of adsorbent

Ambrożek, B.; Zwarycz-Makles, Katarzyna

doi:10.1016/j.enconman.2014.03.055

Cited by 28 publications

(17 citation statements)

References 20 publications

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“…The system of equations (8)-(11) and restrictions (12)-(14) was solved by the finite difference method taking into account the following values of parameters: a eff =1.5D eff,i (Dobre and Sanchez Marcano, 2007), c s =921 J/(kgK) (Ng et al, 2001), k ti =810 -3 m/s (Rezaei et al, 2014), α h =4 W/(m 2 s) (Lee et al, 2011), α 0 =34 W/(m 2 s) (Ambrozek and Zwarycz-Makles, 2014), ΔH di =8.6210 5 J/kg (Ramirez et al, 2005), h=0.0025 m, q ' i0 =0.2 g/g, t 0 =25 °C. Equilibrium acetone concentration (q ' i∞ ) in Eqs.…”

Section: Modelling Of Thermal Desorption Dynamicsmentioning

confidence: 99%

“…Spent adsorbents can be recycled by thermal, chemical, microbiological or vacuum regeneration. In situ thermal regeneration at temperatures of 80-300 °C using steam (steaming) or inert gas (thermal swing adsorption (TSA)) as regeneration agents is commonly employed to recover both adsorbent and adsorbate in small-and large-scale systems (Ambrozek and Zwarycz-Makles, 2014;Giraudet et al, 2009;Lee et al, 2011;Nastaj et al, 2006;Ncube and Su, 2012;Salvador et al, 2015;Shah et al, 2014), whereas ex situ thermal regeneration at temperatures of 60-200 °C in an oven or a thermobalance may be applied to laboratory scale processes in order to recycle the adsorbent.…”

mentioning

confidence: 99%

“…Many researches in the related literature aimed at predicting the dynamics of adsorption and desorption steps of fixed bed TSA process (Ambrozek and Zwarycz-Makles, 2014;Chuang et al, 2003;Giraudet et al, 2009;Lee et al, 2011;Nastaj et al, 2006;Ncube and Su, 2012;Rezaei et al, 2014). A mathematical model describing the adsorption of VOC Downloaded by [Nanyang Technological University] at 14:58 16 June 2016 species from a gas flow onto fixed bed adsorbent and the species desorption from the spent adsorbent using an inert purge gas usually includes characteristic equations of: (i) species mass balance in the gas phase flowing through the bed, (ii) species mass balance within the adsorbent particle, (iii) heat balance in the system, (iv) species mass transfer rate, (v) species equilibrium relationship and (vi) pressure drop across the bed.…”

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confidence: 99%

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Adsorption and Thermal Desorption of Volatile Organic Compounds in a Fixed Bed – Experimental and Modeling

Dobre

Pârvulescu

Jacquemet

et al. 2016

Chemical Engineering Communications

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Adsorption and thermal desorption dynamics of acetone in fixed bed silica gel were studied experimentally and theoretically. The effect of process factors on adsorption and desorption performances was established. Acetone adsorption from air stream was performed by the dynamic (flowing gas) method in a laboratory set-up at two levels of air superficial velocity (0.7 and 1.7 cm/s), temperature (30 and 40 °C) and adsorbent particle diameter (0.21 and 0.54 cm). The values of saturation adsorption capacity (0.147-0.270 g/g) increased up to 78 % and 36 %, respectively, with a decrease in air velocity and adsorption temperature. Acetone thermal desorption from spent silica gel was studied in a thermobalance at three levels of process temperature (60, 70 and 80 °C) and two values of particle size (0.21 and 0.54 cm). Equilibrium desorption efficiency (63-81 %) was up to 14 % larger for finer particles and increased with the desorption temperature. Kinetic models with relevant parameters adjusted based on experimental data were adopted to predict the dynamics of acetone adsorption and thermal desorption. The models simulated well the real conditions and could be applied to scale up and operate the adsorption columns used for air remediation.

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Section: Modelling Of Thermal Desorption Dynamicsmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Adsorption and Thermal Desorption of Volatile Organic Compounds in a Fixed Bed – Experimental and Modeling

Dobre

Pârvulescu

Jacquemet

et al. 2016

Chemical Engineering Communications

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“…Adsorption processes are widely used in the chemical industry, environmental protection and other fields, i.e., for adsorption with chemical reactions [9,10], for separation and purification of gases and liquids [11], in the thermal swing adsorption systems [12].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Analytical and Numerical Models of Adsorber/desorber of Silica Gel-water Adsorption Heat Pump

Zwarycz-Makles¹,

Szaflik²

2017

J. sustain. dev. energy water environ. syst.

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In the paper, comparison of an analytical and a numerical model of silica gel/water adsorber/desorber is presented. Adsorber/desorber as a part of the two-bed single-stage adsorption heat pump is discussed. The adsorption heat pump under consideration consists of an evaporator, two adsorber/desorber columns and a condenser. Only heat and mass transfer was taken into account during operation of assumed adsorption heat pump. Adsorption equilibrium was described by the Dubinin-Astachov model. The presented mathematical models, both analytical and numerical, were created to describe the temperature, heat and concentration changes in the adsorber/desorber and consequently to describe the performance of the adsorption heat pump. Heat and mass transfer equations of the model were solved analytically and calculation parameters were entered in the common spreadsheet. The numerical model was established comprising of the set of heat and mass balance partial differential equations, together with the initial and boundary conditions and was solved by the numerical method of lines. The developed analytical model is very basic and can be used only for the initial estimates of mean cyclic temperature of the cooling/heating water in the adsorber/desorber bed. Validation of the numerical model shows reasonable agreement between the numerical and experimental averaged bed temperatures and is an indication of the proper mathematical modeling and the accuracy of the numerical analysis.

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“…Si bien se han llevado a cabo estudios experimentales de isotermas de adsorción de VOCs sobre diferentes materiales poliméricos (Choung y col., 2001), así como simulaciones teóricas de la utilización de Thermal Swing Adsorption (Ambrozek, 2004), tomando como caso de estudio la adsorción de tolueno sobre Dowex Optipore V493 (un polímero comercializado como adsorbente por Dow Chemical Company), el volumen de información experimental sobre la capacidad de adsorción de materiales poliméricos es sustancialmente menor que sobre zeolitas y carbones activados, siendo claramente este último material el que más ha sido estudiado, tanto en trabajos experimentales como de simulación.…”

Section: Adsorbentes Poliméricosunclassified

Estudio de sistemas combinados de combustión catalítica de VOCs

Campesi¹

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El objetivo general de este trabajo es estudiar sistemas de eliminación de compuestos orgánicos volátiles (VOCs) por medio de la oxidación catalítica de los mismos. A partir de un estudio particular, se pretende alcanzar conclusiones y desarrollos metodológicos que puedan extenderse a otros sistemas, a efectos de definir criterios de selección de diversas alternativas tecnológicas en la eliminación catalítica de VOCs. Se estudia en forma específica la destrucción catalítica de acetato de etilo y etanol producidos en corrientes efluentes de plantas de impresión de envases para alimentos. Los estudios se orientan hacia la propuesta de distintas alternativas utilizando reactores catalíticos, recuperación térmica en un intercambiador de calor y la inclusión o no de un adsorbedor, que actúe como concentrador de la corriente de VOCs, constituyendo un sistema combinado en caso de incluirse el proceso de adsorción/desorción. Para la obtención y análisis de resultados se realiza la simulación de cada uno de los equipos en particular y de la planta en conjunto. Para las simulaciones se estudian distintas metodologías de cálculo de acuerdo al grado de precisión requerido. Dentro de estos objetivos generales, se presentan objetivos específicos como el conocimiento necesario de la interacción de los VOCs, acetato de etilo y etanol, con los materiales adsorbente y catalítico, y los parámetros, de adsorción y cinéticos, que gobiernan estos procesos. Dada la falta de información cinética confiable, surge como un objetivo específico la obtención de la misma a través de la regresión de datos experimentales obtenidos en el INTEQUI sobre un catalizador desarrollado en dicho Instituto.

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Theoretical and experimental studies of the recovery of volatile organic compounds from waste air streams in the thermal swing adsorption system with closed-loop regeneration of adsorbent

Cited by 28 publications

References 20 publications

Adsorption and Thermal Desorption of Volatile Organic Compounds in a Fixed Bed – Experimental and Modeling

Adsorption and Thermal Desorption of Volatile Organic Compounds in a Fixed Bed – Experimental and Modeling

Comparison of Analytical and Numerical Models of Adsorber/desorber of Silica Gel-water Adsorption Heat Pump

Estudio de sistemas combinados de combustión catalítica de VOCs

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