temperature, t/°C 115 Benzene/Toluene (1atm) 110 105 100 95 95 96 90 888 85 80 75 15 0.2 0.4 0.6 0.8 x, y (benzene) 1.0 Data: • t-x-y diagram of the benzene/toluene system, at 1 atm. • Average values of Cp and AHvap between 80°C and 115°C. (J°C¹mol¹) Benzene 158.0 Toluene 184.8 cy (J°C-'mol-¹) 105.8 132.3 AHvap (kJ/mol) 29.76 34.13

500 Kmol/h of an equimolar mixture of benzene and toluene will be partially vaporized by flash distillation. It is intended that in the separator, the temperature is 95°C. Taking the reference temperature as 85°C:

a) Calculate the composition of the streams leaving the separator.
Obtain the feed fraction that is vaporized (V/F) and the liquid and vapor flow rates.

b) What is the enthalpy of the liquid, feed, and vapor?

c) Calculate the feed temperature.