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with a partial pressure of ammonia of 2 kPa. Determine: (i) the volume of gas
leaving in one-hour (ii) kilograms of ammonia are recovered in one hour and
(111) percent recovery.
PART B
Answer any two full questions, each carries 15 marks.
The absolute humidity of a CO2- water vapour mixture at 310 K and 100 kPa is
measured to be 0.022 kg water per kg dry (02. Calculate: (i) the molal
humidity, (ii) the percent saturation and (iii) the percent relative saturation. The
vapour pressure of water in kPa is approximated by the Antoine equation as
3799.887
(T — 46.854)
An evaporator is fed with 100 kg/h of a solution containing 10 % NaCl, 10%

017: = 16.26205 —

NaOH and the rest water. During evaporation, water is removed as vapour and
NaCl crystallises and is removed. The mother liquor contains 50% NaOH and
2% NaCl. Calculate the amount of salt in kilograms, precipitated per hour.
Explain bypass and Recycle operation with the help of an example.
Derive Clausius - Clapeyron equation. Write the major assumptions.
An ideal solution containing 40% A and 60% B is in equilibrium with its
vapour. The vapour pressures of pure liquids at the equilibrium temperature are
80 kPa and 40 kPa for A and B respectively. Calculate: (i) the vapour
composition and (ii) total pressure.
A distillation column separated a feed mixture containing 40% Propane, 40%
Butane and remaining Pentane into an overhead containing 90% Propane, 8%
Butane and remaining Pentane and the bottom product containing 4% Propane.
The reflux ratio is 2 (ratio of recycle to top product). All the compositions given
are on mole basis. On the basis of 1000 moles of feed per hour, Compute:

i) The quantity the top and bottom product.

ii) Recovery of Propane in the top product and Pentane in the bottoms.

111) Recycle ratio (defined as moles recycled to moles fed)
Define: (i) percent saturation, (ii) Dew point, (iii) Wet bulb temperature and (iv)
Humid volume.
The dry bulb temperature and due point of air are 343 K and 308 K respectively.

Estimate the following using psychrometric chart.

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