A system for separating a binary mixture by extractive distillation, followed by ordinary distillation for recovery and recycle of the solvent, is shown in Figure. Are the design variables shown sufficient to specify the problem completely? If not, what additional design variables showed sufficient to specify the problem completely? If not, what additional design variable(s) would youselect?

Essentially 1 atm pressute throughout System Benzene product Makeup chenal 30'C 1 atm 15 35 50.1 300 kma h kmalt/h Cyclohexane product 30 50 kmolihi 200 kmolih 10 1-atm bubble-point Nquid kmolih Phenol recycie Cyelohexane 55 Benzene 45 Steam Steam