Abstract
Coal, slurried with tetralin, and heated rapidly to 400 °C, was converted to benzene-soluble, liquid products through a reaction path which appears to involve thermal cleavage of chemical bonds in the coal (so-called depolymerization). Free radicals formed pyrolytically were stabilized in the early stages by autogenous hydrogen transfer, and in later stages by abstraction of hydrogen from the hydrogen-donating tetralin (which was converted to dihydronaphthalene and then to naphthalene). Vitrinite of the coal particles became almost completely soluble in pyridine after 5 min reaction, and dispersed in the vehicle (tetralin) within about 10 min. Reaction in non-donor vehicles (naphthalene, dodecane) resulted in dispersion, but ‘repolymerization’ formed a benzene-insoluble material. Hydrogen transfer from tetralin increased exponentially with increased conversion of the coal to benzene-soluble material. Negligible influence of particle size (below 2–3 mm) implies that mass transfer is not a rate-limiting factor. High-volatile c bituminous coal and coals of lower rank converted at about the same rate and to the same extent (given equivalent petrographic compositions); approximately two-thirds of the ultimately achievable conversion occurs within 20 min. Higher-rank coals converted at a lower rate. Oxidation of the coal was deleterious to ultimate conversion.
Published Version
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