This r eport describes the purification and determination of freezing points and purity of 37 hydrocarbons of the API-Standard and API-NBS series, including 7 heptanes, 16 octanes, 6 pentenes, cyclopentene, and 7 CgH 12 alkylbenzenes.

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 230 0 to 250 0 C and pressures of hydrogen from 170 to 210 atm, the fractions were completely hydrogenated and that no breakdown of the molecules occurred. CONTENTS

Th is report describes the purification and determination of freezing points and pu rity of 29 h ydrocarbons of the API-Standard and API-N BS series, incl uding 8 nonan cs, 11 alkylcyclopcnta nes, 6 a lkyl cyclohexa ncs, and 4 bu ty lbcnzenes.

No abstract

This paper is the first report on the separation of the hydrocarbons in the kerosene fraction of petroleum, which investigation is being carried on as part of the work of the American Petroleum Institute Research Project 6. That part of the petroleum distilling between 114 0 and 144 0 C at a pressure of 56 mm Hg (corresponding approximately to 200 0 and 230 0 C at 760 mm Hg) was separated into a series of substantially constant-boiling fractions. From the material distilling between 127 0 and 133 0 C (at 56 mm Hg), n-dodecane was isolated by crystallization. All of the material except the isolated n-dodecane was then subjected to a systematic extraction with reflux in a two-solvent process in order to separate the aromatic hydrocarbons from the paraffins and naphthenes. The "clean-up" of the traces of aromatic hydrocarbons was accomplished by adsorption with silica gel. The aromatic fractions were then systematically distilled in fractionating columns of high efficiency. From the material boiling at 56 mm Hg between 127.0 0 and 127.5 0 C, 145 0 and 146.5 0 C, and 148.5 0 to 149.0 0 C, respectively, naphthalene, 2-methylnaphthalene, and 1-methylnaphthalene were isolated by fractional crystallization.