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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Seventh Semester B.Tech Degree Examination (Regular and Supplementary), December 2020

Course Code: CH405
Course Name: CHEMICAL ENGINEERING DESIGN II
Max. Marks: 100 Duration: 3 Hours
Instructions:
1. Graph sheets may be provided
2. Missing data may be assumed suitably
3. The following materials are allowed in the examination:
i. Perry’s Chemical Engineers Hand book (original print and attested photocopies),
McGraw-Hill Int. Edn.
ii. Steam Table (original print), IS Codes, Psychrometric chart.
iii. Attested copies of relevant equations and charts for design of sieve tray from ‘Mass
Transfer Operations’ by Robert E. Treybal (pages 169, 532 to 538), McGraw-Hill Int.
Edn

The attestation must be done by the concerned faculty engaging the subject with official seal.
Answer any two full questions, each carries 50 marks. Marks
1 a) A double-effect long tube evaporator is to concentrate a 10% solution of Sodium (50)
Hydroxide to 40%. The feed is fed at 38°C and carries 5000 kg/hr of NaOH.
Steam is available at 113°C and a vacuum of 710 mm Hg may be maintained in
the last effect. Heat transfer coefficients may be assumed to be 6240 and 3400
W/m’K in the 1" and 2™ effects respectively. Radiation losses and losses by
entrainment may be neglected. Design an evaporator for the purpose. Also sketch
the sectional elevation of the designed evaporator.
2 a) 1000 kg/hr of a mixture containing 60 mole percent acetic acid and 40 mole (50)
percent water is to be fractionated to a distillate containing 95 mole percent water
and a residue containing 97 mole percent acetic acid using a total condenser and
feed is 40% vapour. The enthalpy-concentration data for the water - acetic acid at

1 atm pressure are as follows:

20

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