1.
5 marks questions
a)
At 360 K the vapour
pressure of n-heptane and toluene are 71.2 kPa and 48.9 kPa respectively.
Determine the composition of the liquid and vapour in equilibrium at 360 K and
65 kPa for ideal mixture.
b)
SO2 reacts
with O2 to form SO3. If the reaction is carried out with
50% excess air, but reaction goes 60% completion. Calculate mol fraction of
gases in reactants and products.
c)
If 50 kg of dry solid
containing 6% water is obtained by drying 65 kg of wet material, what was the
initial moisture content?
2. 10 marks questions
a) A
triple effect evaporator is used to concentrate 1000 kg of aqueous solution
from a concentration of 20% solute to 80% solute. Assuming an equal amount of
vaporization in each effect, calculate the composition and weight of solution
entering the second and third effects.
b)
A continuous
distillation column is used to regenerate solvent for use in a solvent
extraction unit. The column treats 200 kmol/h of a feed containing 10% (mol %) ethyl
alcohol and rest water. The overhead product (89 % alcohol) is sent to the
extraction unit and bottom product (0.3% alcohol) is wasted. What is the daily
requirement of make-up alcohol in the solvent extraction unit?
c)
The gaseous reaction A→2B+C
takes place isothermally in a constant pressure reactor. The feed mixture
containing 50% A and the rest inert materials, the ratio of final to initial
volume is found to be 1.8. Find the percent conversion of A
d) A feed of 100 kmol/h of
air is to be partially separated by membrane. Calculate the amounts of two
products (retentate and permeate) for the following cases: i) 50% recovery of O2
to the permeate and 87.5% recovery of N2 to the Retentate ii) 50%
recovery of O2 to the permeate and 50 mol% purity of O2
in the permeate
Ref: STOICHIOMETRY AND PROCESS CALCULATIONS
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