A continuous fractionating column is to be designed to separate 30,000 kg/h of a mixture of 40 percent benzene and 60 percent toluene into an overhead product containitig 97 percent

benzene and a bottom product containing 98 percent toluene. These percentages are by

weight. A reflux ratio of 3.5 kmol to 1 kmol of product is to be used. The molar latent heats of

benzene and toluene are 7360 and 7960 cal/g mol, respectively. Benzene and toluene form an

ideal system with a relative volatility of about 2.5, the equilibrium data is shown in Table 1:

(a) Calculate the moles of overhead product and bottom product per hour

(b) Determine the number of ideal plates needed for the separation Use the Mc-Cabe

Thiele Method. (Molecular weight of benzene is 78 and that of toluene is 92

Equilibrium data are:

Mole fraction of benzene in liquid

0.1, 0.2,0.3, 04, 0.5, 0.6, 0.7, 0.8, 0.9

mole fraction of benzene in vapour

0.22 0.38 0.51 0.63 0.70 0.78, 0.85, 0.91, 0.96

A continuous fractionating column is to be designed to separate 30.000 kg/h of a mixture of 40 percent benzene and 60 percent toluene into an overhead product containing 7 percent benzene and a bottom product containing 98 percent toluene. These percentages are by weight. A reflux ratio of 3.5 kmol to 1 kmol of product is to be used. The molal latent heats of benzene and toluene are 7360 and 7960 calig mol, respectively Benzene and toluene for an ideal system with a relative volatility of about 25, the equilibrium data is shown in Tapie 1 (a) Calculate the moles of overhead product and bottom product per hour (5) Determine the number of ideal plates needed for the separation Use the Mo-Cabe Thiele Method. [Molecular weight of benzene is 78 and that of toluere is 921 Equilibrium data are: Mole fraction of benzene in liquid Mole fraction of benzene in vapour 01 02 0.3 0.4 0.5 0.6 070.B 0.9 0.22 0.38 0.51 0.63 0.70 0.78 0.85 0.91 685