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To obtain information about the chemical constitution of the extract portion of the lubricant fraction from a midcontinent petroleum, fifteen selected fractions, prepared by extensive distillation and extraction, were completely hydrogenated. The hydrogenation procedure is described and there are tabula.ted and compared values for the physical constants of the fractions before and after hydrogenation. Evidence is presented to show that, under the conditions of these experiments, namely, temperatures from 2300 to 2500 C and pressures of hydrogen from 170 to 210 atm, the fractions were completely hydrogenated and that no break-down of the molecules occurred. CONTENTS Page

Hydrogenation of the "extract'' portion of the lubricant fraction from a midcontinent petroleum