Partitioning and adsorption in gas-liquid-solid chromatography: Models of temporal moments for retention and variance |
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Authors: | B J McCoy |
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Institution: | (1) Department of Chemical Engineering, University of California, 95616 Davis, CA, USA |
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Abstract: | Summary The resolution of gaseous chemical species in gasliquid-solid chromatography is influenced by absorption (partitioning) in the liquid and adsorption at the liquid-solid interface. We consider fundamental mass transfer models with adsorption and partitioning effects for solid chromatographic supports covered with thin films of stationary liquid. The dynamic models, based on mass-balance partial-differential equations, include the significant phenomena: convection, axial dispersion, gas-liquid mass transfer, intraparticle diffusion, and liquid-solid adsorption. Expressions for retention time and band variance (first and second temporal moments) are presented and evaluated for four distinct models: (1) capillary tube with inner surface covered with a uniform-thickness liquid film, (2) column of nonporous spheres covered with a uniform-thickness liquid film, (3) porous spherical particles with intraparticle pores covered with a uniform-thickness liquid film, (4) porous spherical particles with intraparticle pores completely filled with liquid. |
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Keywords: | Gas-liquid-solid chromatography Partitioning Adsorption Mass transfer Retention Variance |
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