Abstract
The mass transfer coefficients in the gas chromatography of n-heptane on several kinds of Porapak, Porapak Q modified with various loadings of F-60 silicone oil, some inorganic adsorbent, and an F-60 silicone oil gas-liquid chromatographic (GLC) packing were determined at 150°. The sorbent phase mass transfer coefficients of unmodified Porapak P and Q are comparable with those of alumina and Alusil and do not differ substantially from the liquid phase mass transfer coefficient of the GLC packing. The findings indicate that there is a substantial contribution to the mass transfer resistance due to surface diffusion with all the adsorbents studied. It appears that the sorption mechanism involved in gas chromatography on Porapaks is adsorption rather than bulk dissolution.
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