Low-and high-pressure "pyrolysis experiments employing tetradecane .aqd 4-(1naphthylmethyl)-bibenzyl (NBBM) as "model compounds--for polyethylene and coal, respectively; were conducted at 420"C at different reaetmit loadings both neat and in binary mixtures. These reaetion" sets demonstrated that when reacted in binary m!xtures, the conversion of.tetradecane increased while the selectivities to primary products of NBBM were enhanced in the gas phase. Variation of the relative concentrations of

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... he components revealed that the effat was'indeed a chemical one and not simply a result of dilution. As the polymer mimic to coal model compound ratio increased, there was a decrease in selfinteraetions of NBBM with minimal changes in the degradation products of tetradecane. Increasing the overall reaetion pressure in the system through addition of an inert gas from atmospheric pressure to 2360 psig resulted in small decreases in reactant conversions and altered product distributions only. slightIy. Overall, the experiments canied out demonstrated that favorable hiteraetions exist in the gas phz+e during coprocessing, and thẽ primary reaction 'pathways. ,apd mechanism governing~the interactions be@veen the feedstocks were elucidated.~L ,. ; 7.-.