Gas Chromatographic Analyses of Polar Fractions in Distillable Liquid from Wandoan Coal Hydrogenation Produc

Abstract

The qualitative and quantitative analyses of polar fractions in distillable liquid from Wandoan coal hydrogenation product have been carried out on a Hewlett-Packard 5880 A GC and a Hewlett-Packard 5992 A GC/MS equipped with a fused-silica capillary column (50 m × 0.2 mm)coated with cross-linked methylsilicone. From the distillate (180-420°C) of the coal liquid were separated three polar fractions, acidic, basic and neutral polar fractions.
As shown in Fig.1 and Table 3, the acidic fraction was mainly composed of alkylphenols (76%) and alkylindanolsfalkyltetrahydronaphthols (12%). Since FID gas chromatogram of the basic fraction (Fig.2) was similar to that of NPD, all components in this fraction were concluded to contain nitrogen. As shown in Table 4, this fraction consisted of pyridines, anilines, quinolines, tri- and tetracyclic nitrogen compounds and their hydrogenated compounds. NPD gas chromatogram of the neutral polar fraction showed that the nonbasic nitrogen components, indoles and carbazoles, were contained. Some components of the acidic and neutral polar fractions were observed by FID gas chromatography to overlap each other. The phenolic components with fewer alkyl carbons were in the acidic fraction and the ones with more alkyl carbons were in the neutral polar fraction.