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Intraparticle diffusion coefficients in packed columns: Measurement by arrested‐flow gas chromatography
Author(s) -
Park InSoo,
Smith J. M.,
McCoy B. J.
Publication year - 1987
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690330706
Subject(s) - tortuosity , thermal diffusivity , packed bed , chemistry , diffusion , chromatography , helium , porous medium , porosity , tracer , particle (ecology) , composite number , analytical chemistry (journal) , thermodynamics , materials science , composite material , physics , oceanography , organic chemistry , nuclear physics , geology
Arrested‐flow chromatography was used to determine intraparticle diffusivities of large‐pore particles packed in columns. Particle and column tortuosity factors were determined for helium tracer in nitrogen carrier gas at 40°C and atmospheric pressure. Semiempirical modifications of Maxwell's, Burger's, Jeffrey's, and Rayleigh's relations for the composite diffusivity of spherical particles in a stationary medium are proposed for the effective composite diffusion coefficient for a packed bed of porous particles. The equations, modified to represent accurately the extraparticle void diffusion based on measurements for beds of nonporous particles, are used to evaluate intraparticle diffusivities from experimental data obtained by arrested‐flow chromatography.