✍ Scribed by Ana M. Benito; Maria T. Martínez; Isaias Fernández; Jose L. Miranda
No coin nor oath required. For personal study only.
A residue from deasphalting of liquids obtained by direct liquefaction of a Spanish subbituminous coal was processed by thermal treatment. This residue is rich in asphaltenes which do not undergo cracking easily and are coke precursors in thermal cracking. The kinetics of the cracking and coke formation reactions were studied and the viscosity, coke content, boiling point distribution, elemental analysis and aromaticity of the reaction products were determined. The experimental data fit the first-order kinetic model proposed. The main effects produced by the thermal treatment were a large decrease in the viscosity from 4608 mm2 s-l for the feedstock to 939 mm2 s-' for the product. The conversion of the heavy fraction (b.p. > 350°C and soluble in toluene) increased with the temperature and residence time, the conversion to coke being higher than the conversion to light products (b.p. < 350°C and soluble in toluene).
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