Chemistry of solvents in coal liquefaction: Quantification of transferable hydrogen in coal-derived solvents

✍ Scribed by Masato Aiura; Toshio Masunaga; Kikuo Moriya; Yoichi Kageyama

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 602 KB
• Volume: 63
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(84)90201-1

✦ Synopsis

Hydrogen was evolved as hydrogen sulphide when coal-derived solvents for liquefaction were heated with sulphur (dehydrogenation method) and their naphthene contents were quantified by titration and 13C n.m.r. analysis to estimate the amount of transferable hydrogen from hydroaromatics present in the solvent. Examination of synthetic solvents consisting of model compounds confirmed the validity of. both approaches. The content of transferable hydrogen, thus measured, in the various solvents correlated well with their liquefaction activities using Morwell brown coal. This suggests that the sufficient stabilization of radical fragments derived thermally from the coal at the initial stage of its liquefaction leads to high conversion. It was also shown that the dehydrogenation method was applicable to nondistillable heavy fractions of coal-derived liquids such as SRC which are difficult to measure by n.m.r. because of the/r limited solubility.