The oxygen and nitrogen compound types present in the 700-850 °F fraction of a California crude oil were analyzed by means of a standard separation scheme, high resolution mass spectrometry, and other techniques. All compound types present in other than trace amounts were accounted for; their molecular structures were determined and their concentrations were measured. Major compound types (>0.1% wt) included the indoles, carbazoles, benzcarbazoles, pyridines, quinolines, phenanthridines, hydroxypyridines, hydroxyquinolines, dibenzofuranes, naphthobenzofuranes, phenols, aliphatic ketones, carboxylic acids, and sulfoxides. Lesser amounts of azaindoles, azacarbazoles, phenyl ketones, 2-hydroxybiphenyls, benzofuranes, aliphatic esters and ethers, and aliphatic di-carbonyl compounds (diketones, diesters, etc.) were also present. However, several of the structural assignments for these minor compound types are

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The resolution of normal and isoparaffins in any 100°to 400°F.hydrocarbon mixture containing less than 3.0% olefin, using data from a single mass spectrometer run, is carried out as an extension of any hydrocarbon-type analysis which expresses results in liquid volume per cent. The procedure adds less than half an hour to the hydrocarbon-type analysis.

The usual mass spectrometric procedure for the determination of hydrocarbon types in nonolefinic gasolines containing Cg and lighter hydrocarbons is encumbered by a preliminary distillation to remove the C5 and lighter hydrocarbons. Now, however, the need for preliminary depentanization can be eliminated by the use of gas chromatography in conjunction with the mass spectrometric analysis. Cg and lighter hydrocarbons are determined by any gas chromatographic method which expresses results in liquid volume per cent. On the basis of these data, the mass spectrum of the total gasoline is mathematically corrected for the presence of Cg and lighter hydrocarbons. No loss of accuracy is experienced, and costly distillation time, 2 to 4 hours, is eliminated.

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