Abstract
The effect of column preconditioning temperature (Tcp) on the measured heats of adsorption of selected aliphatic and aromatic compounds for kaolinite and illite, two clay minerals commonly encountered in the oil sands industry, was studied using the technique of inverse gas chromatography (IGC). Tcp was varied from 100 to 340 °C. Our results showed that, as Tcp was increased from 100 to 170 °C, the heats of adsorption (affinities) of the selected aliphatic solutes for kaolinite increased slightly, but those for illite stayed nearly the same. At higher Tcp values (170–230 °C), solute adsorption exhibited essentially no dependence on Tcp for both kaolinite and illite. This observation is attributed to the decreasing hydrophilicity for kaolinite from 100 to 170 °C, but not for kaolinite from 170 to 230 °C or for illite from 100 to 230 °C. Higher Tcp values (230–340 °C) were used for the two aromatic solutes (benzene and toluene), and it was found that their heats of adsorption for illite were significantly r...
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