In the fluid coking process typified by flexicoking residual oil feeds are injected into the Reactor where they are thermally cracked yielding coke and wide range of vapor products vapor leave the reactor and are quenched in scrubber where entrained coke fines are removed the vapors are then fractionated coke from the reactor enters a theater and is devolatilized the volatiles from the heater are treated for fines and sulfur removal to yield