d) A distillation column is fed 100 kmol/h of a mixture of 50 mol % benzene...

Transcribed Image Text:

d) A distillation column is fed 100 kmol/h of a mixture of 50 mol % benzene and 50 mol % toluene at 101.32 kPa abs pressure. The feed is liquid at the boiling point. The distillate is to contain 90 mol % benzene and the bottoms 10 mol % benzene. The reflux ratio is 4.52:1 and equilibrium data for benzene-toluene system at 101.32 kPa are given below, where x and y are mole fraction of benzene. Using the McCabe-Thiele method, 0 0.130 0.258 0.411 0.581 0.780 1.000 y0 0.261 0.456 0.632 0.777 0.900 1.000 i) Calculate the kmol/h distillate, kmol/h bottoms, ii) Calculate the number of theoretical trays needed iii) On which ideal tray should the feed be introduced iv) If the efficiency is 85 per cent, calculate the number of actual plates. (2 marks] (6 marks) 12 marks] 12 marks v) If the tray spacing is suggested to be 1.5m, Determine the height of the column required [2 marks] d) A distillation column is fed 100 kmol/h of a mixture of 50 mol % benzene and 50 mol % toluene at 101.32 kPa abs pressure. The feed is liquid at the boiling point. The distillate is to contain 90 mol % benzene and the bottoms 10 mol % benzene. The reflux ratio is 4.52:1 and equilibrium data for benzene-toluene system at 101.32 kPa are given below, where x and y are mole fraction of benzene. Using the McCabe-Thiele method, 0 0.130 0.258 0.411 0.581 0.780 1.000 y0 0.261 0.456 0.632 0.777 0.900 1.000 i) Calculate the kmol/h distillate, kmol/h bottoms, ii) Calculate the number of theoretical trays needed iii) On which ideal tray should the feed be introduced iv) If the efficiency is 85 per cent, calculate the number of actual plates. (2 marks] (6 marks) 12 marks] 12 marks v) If the tray spacing is suggested to be 1.5m, Determine the height of the column required [2 marks]