Abstract
The use of OPN/Porasil-C, a porous silica with polar o-phthalonitrile groups chemically bonded to the Porasil-C support medium, for the class separation of nitrogen compounds in colat tars is described. Sequential elution of an anthracene oil with solvents of increasing polarity yielded clearly-defined neutral and vasic nitrogen fractions which were characterised by gas chromatography, mass spectrometry and elemental analyses. The neutral and basic nitrogen fractions contained predominantly pyrrolic compounds and aza heterocycles, respectively, but the presence of nitriles in the neutral fraction was confirmed by infrared spectroscopy. The class separation has made it possible to distinguish more easily between isomeric compound types, and has facilitated the identification of peaks in the complex chromatogram of the unfractionated anthracene oil recorded using nitrogen-selective alkali flame detection.
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