Showing papers on "Carbochemistry published in 1998"

A kinetic scheme for catalytic coliquefaction of coal and waste tire

Abstract: Catalytic liquefaction of two bituminous coals and one subbituminous coal was studied separately and with waste tire as solvent at different temperatures and tire/coal ratios. The tire sample represented a mixture of waste, recyclable tires. A ferric-sulfide-based catalyst impregnated in situ in the coal was used as catalyst. Runs were made in a batch tubing-bomb reactor at 350−450 °C. The results indicate that the primary products of coal liquefaction are the asphaltenes, but a significant fraction of the subbituminous coal is also converted directly to oil and gas. The primary products of tire liquefaction are in the oil range. For all the coals, the addition of tire shows a synergistic effect on coal conversion, the synergism being mainly manifested in an increase in the yield of asphaltenes. The extent of synergism depends on process conditions and the coal type. The conversions of all coal types increase dramatically using the catalyst, the catalytic effect being mainly on the coal-to-asphaltenes rea...