A saturated vapor feed flowing at 200 kmol/hr ia a mixture of 80 mol% water, 20 mol%
butanol. The feed is condensed and sent to a liquid-liquid separator. The water layer is taken off
as the water product (at a composition equal to the highest water purity that can be obtained at
the azeotropic point). The butanol (top layer) is sent to a stripping column with a partial reboiler.
The bottoms from the stripping column is the butanol product and contains 4 mol% water. The
stripping column has a boilup ratio of 4. The pressure is 10-1.3 kPa.
a) Find the flow rates of the products (B = butanol, W = water in kmol/hr). B ~ 38
kmol/hr
b) Find the number of stages for the stripping column. ~2 stages + reboiler

  

MA 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 0.1 0.2 0.3 0.4 0.5 Xw 0.6 0.7 0.8 0.9 1