Ponca City 6 crude

Fig. 16. Plot like that shown in Fig. 11 with curves showing values of log /H2 consistent with ratios of hydrocarbons in the Ponca City 6 crude...

Fig. 19. Plot of log fH.2 against temperature showing the values of /H2 calculated for each of the samples reported in the references given for which both acetic and propanoic acids were measured (see text and appendix). Also shown are the values of log /H2 consistent with ratios of hydrocarbons in the Ponca City 6 crude...

Crude Petroleum. This method, in principle, should be applicable to all carbonaceous materials regardless of origin. Preliminary C13 measurements made on a sample of Ponca City crude oil (original petroleum of Project 6, American Petroleum Institute) yielded an aromaticity value of 0.15. 

There are very few data available on alkane isomers above C7 for comparison of petroleum or any other natural product. Some analyses, however, are available for the Cs isomers from alkanes from crude oils. Predicted results from the Fischer-Tropsch equation with / = 0.1 are given in Table II along with analyses of Cs alkanes from two crude oils (2, 4). A very definite exception to the predicted values appears in Table I, namely, the predominance of 2-methylheptane over 3-methylheptane. This observation is contrary to the prediction of the equation. According to scheme B (1) other Ck analyses from crudes made available to the author by M. J, O Neal show the same predominance cf the 2-methyl isomers. A total of four Ch analyses available for comparison represent crudes from western and southwestern United States. As mentioned in (8), 11 out of 14 analyses through the Ct s showed the reversal the three that did not have the predicted reversal also came from the Southwest. It would be of interest to have analyses of Cs s in crudes from other parts of the world in order to study this reversal. For Cn alkanes only partial analyses are available they are Ponca City, Okla. crude (4) and a commercial mixture... 

Fig. 1. Relative quantities and boiling range of major hydrocarbon classes in the crude oil from Ponca City Field (Venuto and Habib, 1978).

Table II. Predicted Composition of Octane Isomers Compared with Values Observed in Two Crude Oils, Mole Percent Predicted, C Alkanes Crude Oils f = 0.1 East Ponca Texas (2) City (4) ...

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