a portion of the thesis submitted by Dewey Robert Levering to the Graduate School of Illinois Institute of Technology in partial fulfillment of the requirements for the Ph.D. degree, August 1950.

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The average numbers of primary CHs, secondary CH2, and aromatic CH groups in hydrocarbons are determined by absorption spectroscopy in the 1.10 to 1.25 µ (8000 to 9000 cm.-1) near-infrared region. A slightly modified, small glass prism

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A method is described for the analysis of wide boiling petroleum fractions with end points below 600°F. Chromatography is used to split the sample into four fractions: nonaromatic, intermediate, pure aromatic, and a pure aromatic "wash."The per cent aromatics in the intermediate fraction is determined by specific dispersion and the total aromatics in the sample is the sum of those found in the intermediate and final two fractions.Total olefins plus aromatics are determined by sulfonation and olefins by difference. Accuracies of 1% are attained with analysis times of less than 8 hours.

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