Analysis of a coal-derived liquid obtained by mild hydrogenation: 3. Acid, base and polar fractions

✍ Scribed by Takashi Katoh; Koji Ouchi

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 868 KB
• Volume: 66
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(87)90025-1

✦ Synopsis

Polar fractions of a coal-derived liquid obtained by mild hydrogenation of Japanese Taiheiyo coal were investigated. The acid fraction was mainly composed of dimethyl or trimethyl phenols with a minor content of indanols. Z = -7 N (tetrahydroquinoline) and -9 N (octahydro-phenanthridine/acridine) series were dominant in the base fraction. Neutral oil was separated into six fractions (DSOl-06) by vacuum distillation and each fraction was further separated into saturate, aromatic and polar fractions by liquid chromatography. The polar sub-fractions of DSOl (b.p. 186281°C) and DS02 (b.p. 281-305°C) were analysed by f.i.m.s. and g.c.-m.s. Phenols and tetralinols (or indanols) both with long alkyl chains were major components of these fractions. Those of DS03%DS06, which were too complex to analyse by g.c. only, were repeatedly hydrogenated to eliminate the functional groups and then dehydrogenated to simpiify the subsequent analysis. The components in the hydrogenated/dehydrogenated products were identified by g.c. and g.c.-m.s. and compared with the type analysis data obtained from f.i.m.s. of each polar subfraction assuming that those aromatic nuclei having hydroxyl functional groups are partially hydrogenated, if at all. Thus a quantitative analysis of the neutral polar fractions was calculated, which shows them to be composed of only seven kinds of aromatic nuclei.