Hardware-Independent Mathematical and Numerical Modeling of a Four Bed Molecular Sieve - Part 1: Modeling and Verification of Gas Adsorption on Zeolite 5A

Mohamadinejad, Habib; Knox, James C.; Finn, John E.; Smith, James E.

doi:10.4271/961405

Cited by 4 publications

(2 citation statements)

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“…For the adsorbent/adsorbate systems and concentrations studied, significant deviations from isothermal conditions were observed. , Therefore, energy balance equations for the gas (fluid), adsorbent, and column wall are included in the model. The gas-phase energy balance is provided in eq .…”

Section: Mathematical Modelmentioning

confidence: 99%

Limitations of Breakthrough Curve Analysis in Fixed-Bed Adsorption

Knox

Ebner

LeVan

et al. 2016

Ind. Eng. Chem. Res.

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This work examined in detail the a priori prediction of the axial dispersion coefficient from available correlations versus obtaining both it and mass transfer information from experimental breakthrough data and the consequences that may arise when doing so based on using a 1-D axially dispersed plug flow model and its associated Danckwerts outlet boundary condition. These consequences mainly included determining the potential for erroneous extraction of the axial dispersion coefficient and/or the LDF mass transfer coefficient from experimental data, especially when nonplug flow conditions prevailed in the bed. Two adsorbent/adsorbate cases were considered, i.e., CO 2 and H 2 O vapor in zeolite 5A, because they both experimentally exhibited significant nonplug flow behavior, and the H 2 O-zeolite 5A system exhibited unusual concentration front sharpening that destroyed the expected constant pattern behavior (CPB) when modeled with the 1-D axially dispersed plug flow model. Overall, this work showed that it was possible to extract accurate mass transfer and dispersion information from experimental breakthrough curves using a 1-D axial dispersed plug flow model when they were measured both inside and outside the bed. To ensure the extracted information was accurate, the inside the bed breakthrough curves and their derivatives from the model were plotted to confirm whether or not the adsorbate/adsorbent system was exhibiting CPB or any concentration front sharpening near the bed exit. Even when concentration front sharpening was occurring with the H 2 O-zeolite 5A system, it was still possible to use the experimental inside and outside the bed breakthrough curves to extract fundamental mass transfer and dispersion information from the 1-D axial dispersed plug flow model based on the systematic methodology developed in this work.

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Section: Mathematical Modelmentioning

confidence: 99%

Limitations of Breakthrough Curve Analysis in Fixed-Bed Adsorption

Knox

Ebner

LeVan

et al. 2016

Ind. Eng. Chem. Res.

Self Cite

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“…The subsystem operates in an open loop configuration with the desorbed CO 2 being vented overboard. Single-Bed Models [5] were developed which simulated gas adsorption in a flow-through bed. Multicomponent adsorption; thermal balances for the pellet, gas, and canister; and the momentum equation were included.…”

Section: H20 Il--__ I_air In Urineinmentioning

confidence: 99%