Pressure Swing Adsorption for Air Purification. 1. Temperature Cycling and Role of Weakly Adsorbed Carrier Gas

Mahle, John J.; Friday, David K.; LeVan, M. Douglas

doi:10.1021/ie950475c

Cited by 22 publications

(13 citation statements)

References 21 publications

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“…In writing Eq. 1, consistent with our systems and pressure‐swing adsorption processes,47, 48 we have assumed that changes in the molar density of the gas phase due to temperature effects are small compared with those due to pressure effects.…”

Section: Materials and Energy Balancessupporting

confidence: 84%

Master curves for mass transfer in bidisperse adsorbents for pressure‐swing and volume‐swing frequency response methods

Wang¹,

LeVan²

2010

AIChE Journal

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A general model has been developed for pressure-swing and volume-swing frequency response methods with analytical solutions derived to analyze various mass transfer resistances in biporous adsorbents. The model can consider a combination of distributed mass transfer resistances acting independently or in series including macropore diffusion, micropore diffusion, and a surface barrier resistance at the entrance of micropores. Heat effects are included for nonisothermal systems. Temperature variations are shown to be less for pressure-swing compared with volume-swing systems. The general model is developed in such a way that information extracted from it is independent of whether a system is batch volume swing or flow-through pressure swing. Simulation results demonstrate that mass transfer mechanisms can be easily discriminated by the master curves. Isothermal models exhibit one-step curves, whereas nonisothermal effects are represented by two-step curves. Examples are given to demonstrate the use of the master curves to describe experimental data.

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Section: Materials and Energy Balancessupporting

confidence: 84%

Master curves for mass transfer in bidisperse adsorbents for pressure‐swing and volume‐swing frequency response methods

Wang¹,

LeVan²

2010

AIChE Journal

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“…Fluid-phase concentrations are assumed to be much more dependent on pressure than temperature because of the large pressure swing between charge and discharge steps. This assumption is often used in pressure swing adsorption models in which the temperature swing is negligible compared to the change in pressure (Mahle et al, 1996). Heat capacities for all components in the feed are assigned constant gas-phase values, which are consistent with the thermodynamic path used to develop the energy balance (Walton et al, 2003).…”

Section: Modeling Assumptionsmentioning

confidence: 99%

Natural gas storage cycles: Influence of nonisothermal effects and heavy alkanes

Walton

LeVan

2006

Adsorption

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A mathematical model is developed for examining the influence of nonisothermal effects and accumulation of heavy alkanes on natural gas storage cycles. The model is solved for the charge and discharge steps of the cycle. This is the first study to solve the natural gas storage problem for a nonisothermal charge of natural gas containing impurities. We examine both adiabatic and isothermal operation of natural gas and pure methane storage cycles on BPL carbon and an activated carbon prepared from coconut shells. Our simulations show for both carbons that the adiabatic gas storage cycles operate under subcooled conditions with respect to the feed temperature due to long discharge times and the desorption heat. It is also shown that degradation of gas storage performance due to impurities depends more on selectivity of the material for heavy alkanes than on adsorption capacities.

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“…But in this study only one overall energy balance was utilised by combining the two energy balances in the gas and stationary phases under an assumption that the adsorbent, adsorbed gas and gas phases are at their thermal equilibrium in the control volume (Mahle et al 1996;Richard et al 2009).…”

Section: Introductionmentioning

confidence: 99%

New momentum and energy balance equations considering kinetic energy effect for mathematical modelling of a fixed bed adsorption column

et al. 2015

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It was aimed to derive rigorous momentum and energy balance equations where the change of kinetic energy in both spatial and temporal domains of a fixed-bed adsorption column was newly taken into account. While the effect of kinetic energy on adsorption column dynamics is negligible in most cases, it can become more and more influential with an adsorption column experiencing a huge pressure drop or with the gas velocity changing abruptly with time and along the column. The rigorous momentum and energy balance equations derived in this study have been validated with two limiting cases: (1) an inert gas flow through a packed column with a very high pressure drop and (2) blowdown of an adiabatic empty column. The new energy balance including the kinetic energy effect paves a way for simulating with an improved accuracy a Rapid Pressure Swing Adsorption process that inherently involves a very high pressure drop along the column and requires very high pressure change rates for column blowdown and pressurisation.

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Pressure Swing Adsorption for Air Purification. 1. Temperature Cycling and Role of Weakly Adsorbed Carrier Gas

Cited by 22 publications

References 21 publications

Master curves for mass transfer in bidisperse adsorbents for pressure‐swing and volume‐swing frequency response methods

Master curves for mass transfer in bidisperse adsorbents for pressure‐swing and volume‐swing frequency response methods

Natural gas storage cycles: Influence of nonisothermal effects and heavy alkanes

New momentum and energy balance equations considering kinetic energy effect for mathematical modelling of a fixed bed adsorption column

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