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Posted By: b.thirumaya prabhu Member Level: Gold Posted Date: 22 May 2008
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2007 Anna University B.Tech Plastic and Polymer LT342 – THEORY AND MECHANISM OF INORGANIC TANNAGES 07 Question paper
ANNA UNIVERSITY :: CHENNAI – 600 025
MODEL QUESTION PAPER
VI - SEMESTER
B.TECH. LEATHER TECHNOLOGY
LT342 – THEORY AND MECHANISM OF INORGANIC TANNAGES
Time: 3hrs Max Marks: 100
Answer ALL Questions
PART – A (10 x 2 = 20 marks)
1. List the various factors influencing the 10 Dq value.
2. State the merits and demerits of two bath tanning.
3. How do you detect the absence of Cr(VI) in BCS.
4. List the merits and demerits of masking.
5. All transition elements do not have tanning potency. Comment.
6. Chromium does not give 100% exhaustion during tanning. State the reasons.
7. Aluminum tanning is reversible. State the reasons.
8. What are the implications of raising the pH to 4.0 during chrome tanning?
9. pH is critical of silica tanning. Evaluate the statement.
10. What is the amount of sulphuric acid required to lower the basicity of 2 kg of 60%
basic BCS to 33%?
PART – B (5 x 16 = 80 Marks)
Question No.11 Compulsory
11. Give a manufacturing procedure for the preparation of BCS. Discuss the influence of various parameters on the preparation of BCS salts.
12.a) Bring out the need for combination tannages. Give the mechanistic classification of the same with examples.
OR
12.b) Compare and contrast the tannage mechanism of aluminum and zirconium.
13.a) Explain in detail the various parameters that influence chrome tanning.
OR
13.b) Explain the mechanism of binding of chromium to collagen using various theories. Bring out the reasons for the high hydrothermal stability of chrome tanned leathers.
14.a) Explain in detail the valence bond and crystal field theory. State the most stable state of chromium based on these theories.
OR
14.b) Explain in detail olation, oxolation and polymerization. Bring out the significance of each.
15.a) Write short notes on:
(i) Stiasny series
(ii) Auxiliary uses of silica
(iii) Role of acid and salt in picking
OR
15.b) (i) Self-basifying chrome tanning system
(ii) Types of one bath tannage
(iii) Procter basicity
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