Abstract
Gel permeation and gas chromatographic analyses of crude paraffinic waxes are reported. Molecular weights ( M n and M w and molecular-weight distributions of crude paraffinic waxes containing different amounts of oil have been determined using a gel permeation chromatographic calibration curve for n-paraffins. A fraction consisting mostly of n-C 18C 30 yields a distribution curve that peaks at 27.6 counts with a M w / M n ratio of 1.02 using four 4 ft. X 3/8 in. Styragel columns having pore volumes of 500, 500, 100 and 100 Å. A fraciton consisting of mostly oil (m.p. <23°) yeilds a distribution curve that peaks at 27.9 counts, with a M w / M n ratio of 1.09. It is shown that gel permeation chromatography gives reliable M n and M w values for crude paraffins having M w / M nn <1.05 or containing <30 wt. % oil, using a calibration curve for n-paraffins. Gas and gel permeation chromatograms of the fractions are presented and are found to complement each other well.
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