An Improved Molecular Sieving Procedure for the Determination of Total Normal Paraffins in Microcrystalline Wax

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Abstract
An improved molecular sieving technique has been developed for the determination of the total normal paraffin content of microcrystalline waxes. The absorption of normal paraffins is carried out at 180°C from a decalin solution without refluxing. Experimental results obtained during the development of the new technique indicated that absorption of normal paraffins from microcrystalline waxes containing aromatics was incomplete when conventional sieving techniques were employed. The apparent “aromatic inhibiting” effect observed appears to be specific to the highly substituted monoaromatics found in microcrystalline waxes. Principal advantages of the new technique are: 1) the procedure is applicable to both paraffin and microcrystalline waxes, 2) no prior removal of aromatics from microcrystalline waxes is necessary and 3) complete absorption of normal paraffins is attained in less time than that required with the conventional technique.

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