A Comparative Chromatographic Study of Liquid Adsorption and Diffusion in Microporous and Macroporous Adsorbents

Yue Sheng Lin; Yi Hua Ma

doi:10.1021/ie00089a020

A Comparative Chromatographic Study of Liquid Adsorption and Diffusion in Microporous and Macroporous Adsorbents

Yue Sheng Lin, Yi Hua Ma

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Abstract

Mathematical analysis is presented for mass transfer in liquid chromatographic columns packed with microporous and macroporous adsorbents using a pore diffusion model and a pore diffusion and adsorption model. The numerical solutions and moment equations show that the two models are mathematically identical, but with different values for the adsorption equilibrium constant, K_e, and the effective intraparticle diffusivity, D_e. The experimental results on D_e for liquids in silicalite crystals (micropores) and an activated alumina (macropores), however, suggest that the pore diffusion model is appropriate for microporous adsorbents, and the pore diffusion and adsorption model is suited for macroporous adsorbents. Experimental results also show that values of D_e for liquids are of a similar order as those for gases in silicalite and are about 3 orders of magnitude smaller than those for gases in the alumina.

Original language	English (US)
Pages (from-to)	622-630
Number of pages	9
Journal	Industrial and Engineering Chemistry Research
Volume	28
Issue number	5
DOIs	https://doi.org/10.1021/ie00089a020
State	Published - May 1 1989
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Industrial and Manufacturing Engineering

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title = "A Comparative Chromatographic Study of Liquid Adsorption and Diffusion in Microporous and Macroporous Adsorbents",

abstract = "Mathematical analysis is presented for mass transfer in liquid chromatographic columns packed with microporous and macroporous adsorbents using a pore diffusion model and a pore diffusion and adsorption model. The numerical solutions and moment equations show that the two models are mathematically identical, but with different values for the adsorption equilibrium constant, Ke, and the effective intraparticle diffusivity, De. The experimental results on De for liquids in silicalite crystals (micropores) and an activated alumina (macropores), however, suggest that the pore diffusion model is appropriate for microporous adsorbents, and the pore diffusion and adsorption model is suited for macroporous adsorbents. Experimental results also show that values of De for liquids are of a similar order as those for gases in silicalite and are about 3 orders of magnitude smaller than those for gases in the alumina.",

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AU - Lin, Yue Sheng

AU - Ma, Yi Hua

PY - 1989/5/1

Y1 - 1989/5/1

N2 - Mathematical analysis is presented for mass transfer in liquid chromatographic columns packed with microporous and macroporous adsorbents using a pore diffusion model and a pore diffusion and adsorption model. The numerical solutions and moment equations show that the two models are mathematically identical, but with different values for the adsorption equilibrium constant, Ke, and the effective intraparticle diffusivity, De. The experimental results on De for liquids in silicalite crystals (micropores) and an activated alumina (macropores), however, suggest that the pore diffusion model is appropriate for microporous adsorbents, and the pore diffusion and adsorption model is suited for macroporous adsorbents. Experimental results also show that values of De for liquids are of a similar order as those for gases in silicalite and are about 3 orders of magnitude smaller than those for gases in the alumina.

AB - Mathematical analysis is presented for mass transfer in liquid chromatographic columns packed with microporous and macroporous adsorbents using a pore diffusion model and a pore diffusion and adsorption model. The numerical solutions and moment equations show that the two models are mathematically identical, but with different values for the adsorption equilibrium constant, Ke, and the effective intraparticle diffusivity, De. The experimental results on De for liquids in silicalite crystals (micropores) and an activated alumina (macropores), however, suggest that the pore diffusion model is appropriate for microporous adsorbents, and the pore diffusion and adsorption model is suited for macroporous adsorbents. Experimental results also show that values of De for liquids are of a similar order as those for gases in silicalite and are about 3 orders of magnitude smaller than those for gases in the alumina.

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A Comparative Chromatographic Study of Liquid Adsorption and Diffusion in Microporous and Macroporous Adsorbents

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