Question TWO (20-points) Two thousand pounds per hour of vacuum residue is fed into a flexicoker which has a CCR of 18%. Find the circulation rate of coke between the reactor and the burner in order to keep the temperature of the reactor, heater and burner (gasifier) at 1000,1300 and 1500F, respectively. The low Btu gas (LBG) flow rate is 2000lb/h. The specific heat of carbon =0.19 Btu/lbF and the specific heat (cp) for the gases =0.28Btu/lbF. The net coke production in this case is 2.0wt%. Assume 75% of the coke is consumed in the burner