In analyzing mineral oils, gas oils, etc., in terms of groups of molecules of the same hydrocarbon type, it is desirable to separate the sample into fractions, each of which contains a single hydrocarbon type. Of the separation processes useful for this purpose, chromatography is outstanding. Three chromatographic methods of analysis were examined in a study of the hydrocarbon type composition of a IN THE study of petroleum refining processes it is frequently necessary to determine compositions of liquid hydrocarbons boiling in the gas oil and higher ranges. The approach to the analysis of these petroleum fractions has resolved itself into three lines of attack during recent years-i.e., analysis in terms of individual hydrocarbons, number of carbon atoms in rings and in alkyl chains, and molecular types.

A laboratory arrangement is described which allows for efficient distillations. Each stall Is designed to accommodate any one of a variety of types of columns and is provided with utilities for operation at atmospheric or subatmospheric pressures. Selected

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