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    Comparison of Structural Group Analyses by Spectrometric and Physical Property Methods

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    Recent advances in nuclear magnetic resonance and high molecular weight mass spectrometry have made it possible to obtain more detailed information on the composition of gas oils than has heretofore been available. The results obtainable by these techniques are discussed in other papers in this symposium and will not be reviewed in detail here. Because of the important position which catalytic cracking occupies in refining operations, and because of the need for more adequate feed characterization methods, it was believed desirable to examine a large number of catalytic cracking feed stocks (gas oils) by the two new methods. To assay the reliability of the new data, the results were compared on the basis of parameters determinable by other analytical methods. One such parameter is the sulfur content of the gas oil as determined by the Dietert method. Sulfur contents calculated from the mass spectrometer analyses generally agreed well with the observed sulfur contents. Comparisons of per cent CA (per cent of total carbon present in aromatic rings) and per cent CN (per cent of carbon present in naphthenic rings) with similar values obtained from available physical property correlations revealed certain discrepancies. Since the mass spectrometer and nuclear magnetic resonance values for CA showed excellent agreement, it was decided to investigate the validity of the various physical property methods by application to pure compounds. This is admittedly a severe test of correlation methods, but it served to uncover serious deficiencies and point the way to significant improvements. This paper summarizes the results of this study.

    Author Information:

    Hastings, S. H.
    Humble Oil and Refining Co., Baytown, Tex.

    Johnson, B. H.
    Humble Oil and Refining Co., Baytown, Tex.

    Lumpkin, H. E.
    Humble Oil and Refining Co., Baytown, Tex.

    Williams, R. B.
    Humble Oil and Refining Co., Baytown, Tex.

    Committee/Subcommittee: D02.04

    DOI: 10.1520/STP46931S