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8105002 
Journal Article 
Coprocessing coal with hydrogenated vacuum pyrolyzed tire oil 
Shi, Y; Shao, L; Olson, WF; Eyring, EM 
1997 
42 
4 
1039-1042 
English 
A two-step coprocessing of waste rubber tires with a high volatile bituminous coal is advantageous. The first step involves pyrolyzing the waste rubber tires under vacuum at 600 °C. The condensed volatile material, called vacuum pyrolyzed tire oil (VPTO), is then used as a coal solvent. This solvent increases coal conversion to liquids by 20% when compared to coal conversion with waste rubber tire crumb. GC/MS and NMR analyses of the VPTO show the presence of nonhydrogen donor molecules, such as naphthalene, anthracene, phenanthrene. pyrene, and their methylated derivatives. Partial hydrogenations of VPTO were carried out using different types of presulfided hydrogenation catalysts, including Ni/Al2O3, CoMo/Al2O3, NiMo/Al2O3, NiW/Al2O3, Ni/SiO2-Al2O3, Pd/activated carbon, unsulfided Pt/Al2O3 and Pt/activated carbon. The hydrogenations of VPTO were also investigated under different temperatures and hydrogenation pressures when the catalyst was Ni/Al2O3. The hydrogenated products were characterized by NMR, GC, GC/MS and elemental analysis. The partially hydrogenated VPTO (HVPTO) products were then coprocessed with different coal ranks at different reaction temperatures and pressures with and without finely dispersed Mo naphthenate, Mo(CO)6, (NH4)2MoS4 and Mo/Fe2O3/SO4 catalysts. Several model compounds were coprocessed with coal in order to make comparisons with the HVPTO. 
Coal; Coprocessing; Hydrogenation; Vacuum pyrolyzed tire oil