Chemical Technology - Dec 2015
Chemical Engineering (Semester 5)
TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.
Write short note on (any four):
1 (a) Differentiate between Soaps and detergents.(5 marks)
1 (b) Differentiate between HDPE and LDPE.(5 marks)
1 (c) Describe Mercury cell for Caustic soda.(5 marks)
1 (d) What is starch? What are its sources? Enumerate its applications.(5 marks)
1 (e) Differentiate between refining and cracking.(5 marks)
2 Describe DCDA process for sulfuric acid manufacture from elemental sulphur with reference to:
i) Why multistage reactor used?
ii) Why interpass absorption done?
iii) How energy conservation achieved?
iv) What are typical process conditions?
v) What is the typical SO2 conservation achieved and composition of tail gas?(20 marks) 3 (a) Explain manufacture of phenol using Toluene as a raw material in brief.(10 marks) 3 (b) Describe manufacture of sugar from sugar cane. And explain inversion of sugar.(10 marks) 4 (a) Describe the manufacturing process used for synthesis of ethylene by naphtha cracking.(10 marks) 4 (b) Explain the manufacture of Soda ash by Solvay process.(10 marks) 5 (a) Describe manufacturing process of styrene starting from ethyl benzene. What are the major engineering problems associated with the process? How will you produced 99.9% pure styrene.(12 marks) 5 (b) Describe the manufacture of PTA with simple sketch.(8 marks) 6 (a) Describe manufacture of Polytheylene in details.(10 marks)
Write short note on (any two):
6 (b) (i) Hydrogenation of oil.(5 marks) 6 (b) (ii) Dyes and intermediates.(5 marks) 6 (b) (iii) Energy picture of india.(10 marks)