Abstract
A method for determination of waxes contained in asphalts using silica gel chromatography which had been developed by Schwartz has been studied. The chromatographic method utilized Davison grade 70 and grade 912 silica gel as the adsorbents, and cyclohexane as solvent, to separate saturates. The saturates were isolated from the asphalts which were mixed with known weight of paraffin wax or microcrystalline wax and from paving asphalts on the market, then the saturates were separated into wax and oil by conventional solvent dewaxing. The dewaxing operation was carried out by cooling to -20°C, a methyl isobutyl ketone solution containing the saturates. The procedure described showed good repeatability for determination and provided a comparatively rapid method of determining waxes contained in asphalts.
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