A New Method for Characterizing Mixtures of Creosote and Petroleum Oils

This method, called the “Glycol-Insoluble” method, is an alternative selective-solvent method of characterization that appears to be a completely adequate replacement for the ODPN test, now no longer available. Triethylene glycol (TEG) and Skellysolve C, a solvent naphtha, can be used in the recommended proportions as a two-component selective-solvent system to detect the presence of petroleum or petroleum products in creosote-petroleum solutions, either as adulterants or as desired components in such solutions. The test is based on the partition of the more aromatic, the less aromatic, and the aliphatic constituents of such blends between the two solvents. The complex solubility relationships operating in the application of this empirical test are at present not clearly definable. The data are determined on a volumetric basis, and are reported as percent glycol-insoluble. The insoluble values or “indices” agree closely with data previously obtained with the ODPN test.

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