COMPOSITIONAL STUDIES OF HIGH-TEMPERATURE COAL-TAR BY GC-FT-IR ANALYSIS OF MIDDLE OIL FRACTIONS

Capillary gas chromatography-Fourier transform infrared spectrometry-g as chromatography retention indices (g.c.-FT-i.r.-RI), combined with s lope factors for the relation between retention indices and boiling po ints for homologous series, enables the composition of middle oil frac tions in high-temperature coal tar to be determined. The identificatio n of a component can be confirmed by its g.c. retention index and a co mputerized search of spectral libraries. More than 41, 53, 64 and 60 c ompounds were isolated and identified in middle oil fractions F-3, F-4 , F-5 and F-6 respectively. There is an obvious immediate application in tar distillation processing and pollution monitoring where such com pounds may be present. (C) 1997 Elsevier Science Ltd.