Please write the solution by trial and error based on this graph.

(reference: ex 21.1 Mc.cabe Unit Operation textbook)

Homework 1 A mixture of 40 mole percent benzene and 60 mole percent toluene is subjected to flash distillation at a separator pressure of 1 atm. The incoming liquid is heated to a temperature that will cause 20 percent of the feed to flash. (a) What are the compositions of the vapor and liquid leaving the flash chamber? (b) What is the required feed temperature? (Hint: Ex. 21.1) T-x-y Diagram for Benzene-Toluene System at 1 atm 115.0 110.0 105.0 100.0 95.0 Temperature, degrees C 90.0 85.0 80.0 75.0 70.0 0.00 0.10 0.90 1.00 0.20 0.30 0.40 0.50 0.60 0.70 0.80 Mole Fraction of Benzene in Vapour (V) and Liquid (x)