Gas sorption kinetics by differential closed-loop recycle method: Effect of heat of adsorption

Sircar, Shivaji

doi:10.1007/s10450-006-0502-z

Cited by 8 publications

(7 citation statements)

References 13 publications

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“…It should be mentioned here that non-isothermal gas sorption kinetics by a differential closed-loop recycle method was studied in a recent publication (Sircar, 2006). Equation (5) above is a limiting case of Eq.…”

Section: Mathematical Modelmentioning

confidence: 94%

“…On the other hand, analytical solutions of non-isothermal models describing the mass and heat balance equations for various differential adsorption tests (DAT), where the changes in the adsorbate loadings and the adsorbent temperatures are deliberately kept small, have been obtained by many authors. Table 1 provides a list of several DAT models (Chihara et al, 1976;Ruthven et al, 1980;Sircar, 1983Sircar, , 1994Sircar, , 2006Sircar and Kumar, 1984;Haul and Stremming, 1984;Sun et al, 1993;Silva et al, 2001;Brandani, 2003). The differential tests offer three key advantages:…”

Section: Introductionmentioning

confidence: 99%

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Removal of heat of adsorption from adsorbent by forced convection

Sircar

2006

Adsorption

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An analytical mathematical model is used to investigate the effectiveness of forced convection for removal of the heat of adsorption from an adsorbent mass undergoing a differential adsorption process in a flow system. An example of such a process is measurement of gas adsorption kinetics using a differential adsorption bed. Isothermal operation may not be achieved even when a high gas flow rate is used, particularly if the sorption kinetics is relatively fast. Very small changes in the adsorbent temperature can cause significant departure from the isothermal uptake behavior when the heat of adsorption is moderately large. A criterion for validity of isothermal data analysis is given.

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Section: Mathematical Modelmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Removal of heat of adsorption from adsorbent by forced convection

Sircar

2006

Adsorption

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“…The linear driving force (LDF) mass transfer model, − which is a tradition model, used to describe fixed-bed adsorption in this work, is given below: ∂ q ∂ t = k ( q * − q ) where q * is the equilibrium adsorption capacity, g·(100 g) −1 .…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The physical parameters and its values of activated carbon in this model were mentioned in the literature, − , and the values of the main parameters are listed in Table .…”

Section: Mathematical Modelmentioning

confidence: 99%

Adsorption Modeling with Soret-Like and Dufour Effects of a Two-Component Organic Gas on Activated Carbon

Liu

Xin

et al. 2011

J. Chem. Eng. Data

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Adsorption of a two-component gas mixture of acetone and methylbenzene was tested in a fixed-bed apparatus, and a coupled model of heat and mass transfer was developed according to the theory of Soret and Dufour effects. The numerical simulation results agreed well with the experimental results. Using this mathematical model, the coupled effects of heat and mass transfer were studied in a fixedbed adsorption simulation, and numerical analysis results were used to discuss the influences of heat transfer coefficients, mass transfer coefficients, and the coupled effect of heat and mass transfer on the fixed-bed process. These results show that heat transfer coefficients have little effect on mass transfer. In contrast, mass transfer coefficients have some impact on heat transfer. The mass transfer effect caused by the temperature gradient is more obvious than the heat transfer effect caused by the concentration gradient.

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“…As a result of the heat and mass transfer coupling, as well as many other factors, it is hard to theoretically calculate the mass transfer coefficient of the LDF model, and the simulation method is most currently used. ,, This is supported by a large difference among published data in relevant literature. The change of mass transfer coefficients in the desorption process is discussed in this paper.…”

Section: Mathematical Modelmentioning

confidence: 99%

Estimation of Volatile Organic Compound Mass Transfer Coefficients in the Vacuum Desorption of Acetone from Activated Carbon

Liu

Qin

et al. 2010

J. Chem. Eng. Data

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The export concentrations of acetone desorption from activated carbon at different temperatures, vacuum degrees, and saturated adsorption capacities were measured. The results showed that the greater the desorption vacuum degree and the initial adsorption capacity, the smaller the desorption rate. Given the adsorbent microporous capillary effect and the mass transfer in the process of desorption, the concentration curve reflects three phases, which are the vacuum-concentrated phase, fast attenuation phase, and slow attenuation phase. Through theoretical analysis and a coupled model of the desorption process, numerical simulation of the acetone desorption from activated carbon was carried out. Experimental and theoretical analysis showed that small temperature changes were caused by desorption; therefore, the change of the mass transfer coefficient and concentration caused by the temperature change is also small. In different desorption phases, a coupled effect on the mass transfer coefficients have different influences on the concentration curve. For the same initial adsorption capacity, the greater the partial pressure of the acetone, the larger the mass transfer coefficient. Obtaining the mass transfer coefficient and axial dispersion coefficient by sections can make the numerical results coincide well with the experimental data, and the axial diffusion coefficient should not be ignored in vacuum desorption.

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Gas sorption kinetics by differential closed-loop recycle method: Effect of heat of adsorption

Cited by 8 publications

References 13 publications

Removal of heat of adsorption from adsorbent by forced convection

Removal of heat of adsorption from adsorbent by forced convection

Adsorption Modeling with Soret-Like and Dufour Effects of a Two-Component Organic Gas on Activated Carbon

Estimation of Volatile Organic Compound Mass Transfer Coefficients in the Vacuum Desorption of Acetone from Activated Carbon

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