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A correlation has been made of the properties of 179 fractions of oil prepared by extensive distillation and extraction of the extract portion of the lubricant fraction from a midcontinent petroleum. The correlation includes a comparison of the properties of these fractions with those of a selected 15 of the same fractions after complete hydrogenation, with those of synthetic hydrocarbons of high molecular weight, and with those of fractions· of "water-white" oil previously prepared from this same lubricant fraction. The following physical and chemical properties have been compared: Specific optical dispersion, specific optical refraction, specific optical rotation, aniline point, viscosity at 100° and at 210° F, kinematic-viscosity index, and boiling point at 1 mm Hg. The sulfur, oxygen, and nitrogen content and the value of x in the expression CnH 2n+z have also been considered. Concerning the chemical constitution of the lubricant fraction of a midcontinent petroleum from which the "wax" and "asphaltic" constituents have been removed, the following conclusions are drawn: (1) about 60 percent of the material consists of naphthenes with from 1 to 3 rings per molecule (a very small amount of material containing 4 naphthenic rings is probably present also); (2) about 15 percent of the material consists of molecules with 1 aromatic ring and from 1 to 3 naphthenic rings per molecule, together with a small amount of sulfur and oxygen compounds; (3) about 14 percent of the material consists of molecules with 2 aromatic rings (linked through two common carbon atoms) and about 2 naphthenic rings per molecule, together with a small amount of sulfur and oxygen compounds; (4) about 11 percent of the material consists of molecules with more than 2 aromatic rings (each probably linked through two common carbon atoms) and 1 or 2 naphthenic rings per molecule, together with some sulfur, nitrogen, and oxygen compounds. CONTENTS Page

Chemical constitution of the "extract" portion of the lubricant fraction from a midcontinent petroleum