Shale nonpolar fraction

APPROX. COLUMN TEMP..-C NONPOLAR FRACTION OF SHALE OIL... 

NONPOLAR FRACTION OF SHALE OIL OMOV-101 35 X. 03" PLOT COLUMN... 

Figure 4, Gas chromatogram of nonpolar fraction of TOSCO 11 (Green River) shale oil on a 100 X, 03 in. i,d. FFAP PLOT column. Substrate Chromosorb R6470-1 temperature program 40°-225°C at 4" C/min,...

Despite the usual preference in GC for the application of more polar stationary phases for the resolution of polar species, the former may be applied usefully for nonpolar separations. Figure 4 illustrates the resolution of the alkane-alkene pairs of the hydrocarbon fraction of shale oil (sample as in Figure 2), on a FFAP PLOT column (100ft). FFAP is Carbowax 20M terminated with terephthalic acid residues. This column selectively retains olefins and enables base-line resolution of the alkane-alkene pairs. The only disadvantage of this phase is its temperature limitation of ca. 250°C. Identification of the numbered peaks in Figure 4 was achieved by interfaced MS (components are listed in Table 1). 

On considering the optimal chromatographic conditions for analysis of the more polar constituents of shale oil it becomes apparent that both packed columns and PLOT columns have useful features. An example involves the acid-component fraction of shale oil obtained by sodium hydroxide extraction, removal of nonpolar species with benzene, methyl-... 

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