Abstract
This chapter discusses the pretreatment of coals with supercritical solvents under coal liquefaction conditions. In a study described in the chapter, sample coals were dried in an atmosphere of nitrogen, were ground to pass 200 Tyler mesh, and were slurried with a large amount of the concerned solvent. Most of the experiment was carried out at temperatures of 400°C under high pressures of 20, 40, and 60 MPa using a self-made tubular-type reactor. The products were recovered and divided into low-boiling fractions as a distilled solvent and a high-boiling fraction as residue. This was accompanied using a vacuum distillation until the distillates were no longer detectable. The high-boiling fraction was further fractionated into hexane-soluble, benzene-soluble, tetrahydrofuran-soluble materials, and unreacted residue. In tetralin, the coal conversion gradually increased up to 100 daf %; the pretreatment profiles were similar with those of usual coal hydroliquefaction profiles.
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