STUPIDSID
1(a)
Define q factor is distillation and give its significance.
4 M
1(b)
Discuss the selection criteria for solvent liquid-liquid extraction.
4 M
1(c)
Explain the factors affecting leaching operation.
4 M
1(d)
Give the properties of adsorbents.
4 M
1(e)
State and explain the &Delta
4 M
2
For a binary system of heptane-ethylbenzene the equilibrium data are as follows:
A feed mixture composed of 42 mole% heptane and 58 mole% ethyl benzene is to be fractionated to yield an overhead product of 197 mole% heptane and a residue of 99 mole ethyl benzene.
(i) Using reflux ratio of 1.5 find the number of equilibrium stages needed for saturated liquid feed and a bubble point reflux by the McCabe-Thiele method.
(ii) Find the minimum reflux ratio.
(iii) Find the number of equilibrium stages at total reflux.
| x | 0 | 0.08 | 0.185 | 0.251 | 0.333 | 0.487 | 0.651 | 0.788 | 0.914 | 1 |
| y | 0 | 0.233 | 0.428 | 0.514 | 0.618 | 0.729 | 0.834 | 0.904 | 0.963 | 1 |
A feed mixture composed of 42 mole% heptane and 58 mole% ethyl benzene is to be fractionated to yield an overhead product of 197 mole% heptane and a residue of 99 mole ethyl benzene.
(i) Using reflux ratio of 1.5 find the number of equilibrium stages needed for saturated liquid feed and a bubble point reflux by the McCabe-Thiele method.
(ii) Find the minimum reflux ratio.
(iii) Find the number of equilibrium stages at total reflux.
20 M
3(a)
Give the procedure to find the height of packed bed for liquid-liquid extraction tower.
10 M
3(b)
Derive Fenske's equation for minimum no. Of stages at total reflux.
10 M
4(a)
Explain the construction and working of Bollmann extractor.
6 M
4(b)
For extraction of dioxane from water, benzene is used as an extraction solvent. At 298K, the equilibrium distribution of dioxane between water and benzene is as given below:
At these concentrations, water and benzene are substantially insouluble 1000kg of solution containing 25% dioxane is to be extracted with benzene to remove 95% of the dioxane free benzene is used.
(i) calculate the solvent requirement for single batch operation.
(ii) If the extraction were done: in four stages cross current unit using 750 kg of pure benzene each time, determine the final raffinate concentration and the percentage removal of dioxane from feed solution.
| Weight % dioxane in water | 5.1 | 18.9 | 25.2 |
| Weight % dioxane in benzene | 5.2 | 22.5 | 32 |
At these concentrations, water and benzene are substantially insouluble 1000kg of solution containing 25% dioxane is to be extracted with benzene to remove 95% of the dioxane free benzene is used.
(i) calculate the solvent requirement for single batch operation.
(ii) If the extraction were done: in four stages cross current unit using 750 kg of pure benzene each time, determine the final raffinate concentration and the percentage removal of dioxane from feed solution.
14 M
5(a)
Discuss the adsorption in fixed beds. Explain break through curve and adsorption zone.
10 M
5(b)
A hot solution of 5000kg containing Na2CO3 and water with a concentration of 25% by weight Na2CO3 is cooled to 20°
10 M
Write short notes on any Four out of following
6(a)
Minimum and maximum boiling azeotropes.
5 M
6(b)
Ion Exchange
5 M
6(c)
Hollow and spiral wound membranes
5 M
6(d)
Reverse osmosis
5 M
6(e)
Oslo cooling crystallizer
5 M
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