The vapor phase alkylation of phenol is carried out by a selective zeolite catalyst to yield a mixture of 35 mole p - cresol and the rest phenol. The mixture which is at its bubble point is to be...

The vapor phase alkylation of phenol is carried out by a selective zeolite catalyst to yield a mixture of 35 mole p - cresol and the rest phenol. The mixture which is at its bubble point is to be separated at 1 atm pressure in a stripping column having nine ideal trays and a partial reboiler at a rate of 50 kmol / h to yield 95% p - cresol as the bottom product. The relative volatility of phenol in the mixture is 1.76. Calculate (a) the composition of the top product and (b) the boil - up rate, Vm / W.