Abstract
Gas chromatography-mass spectrometry (GC-MS) has been used to identify nitrogen compounds in basic fractions from three coal liquefaction products. Selective chemical derivatisation was used to assist in distinguishing between the various possible isomeric compounds types. The compounds thus identified were quantified by GC in conjunction with flame-ionisation detecton (FID); they were largely aza heterocycles and anilines, no higher aromatic primary amines being identified. The use of a nitrogen-selective alkali-flame detector for the direct GC determination of nitrogen compounds in unfractionated coal liquefaction samples was evaluated, and the results agreed satisfactorily with those obtained by GC-FID analysis of the basic fractions.
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