Abstract
Coprocessing of Forestburgh subbituminous coal with Cold Lake vacuum bottoms in the presence of H 2S as a promoter using a continuous-flow bench scale pilot plant resulted in high coal and pitch conversions and distillate yields. On the basis of the results, it is proposed that H 2S acts as a hydrogen donor under coprocessing conditions. The hydrogen transfer from H 2S to radicals that are formed from coal or bitumen can take place directly or via coal-derived liquids. The activity of H 2S under coprocessing conditions is also compared with the activity of pulverized coal impregnated with iron sulphate.
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