Coupound class separation of petroleum resids : relating coke yields and heteroatom content to chemical structure

Coke precursors are clearly concentrated in the acid and base fractions of each resid. Their tendency toward coke formation can simply be attributed to their relatively low H/C ratio, rather than to any specialized functional group effects. The partitioning of nitrogen and nickel between MCR volatiles and solids show a dependance on composition of the resids