Graduate Thesis Or Dissertation
 

A mathematical model for capillary gas chromatography

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/n009w464r

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  • In the study of gas chromatography a model is presented to simulate a capillary gas chromatographic system. The model was developed to study the concentrations of sample gas as a function of time and space as it travels through the capillary column. The molecular migration was approximated by elementary diffusion theory and the adsorption processes were described with Langmuir theory. A computer code was written to solve numerically the two coupled differential equations derived for the model. A commercial gas chromatograph fitted with a capillary column, was used for aquisition of data. The experimental system consisted of a translucent teflon tubing, .0381 cm I.D., as the capillary column. Boron trifluoride was used as the sample gas and argon was used as the carrier gas. The computer code based upon the derived model was used to evaluate the diffusion coefficient, mean adsorption time, and the probability of adsorption from experimental data. Reasonable correlations were obtained.
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