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Chemical Engineering - Mass Transfer

Exercise : Mass Transfer - Section 12
21.
An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is
9.21
4.605
100
0.001
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
HETP is numerically equal to HTU, only when the operating line
lies below the equilibrium line.
lies above the equilibrium line.
and equilibrium lines are parallel.
is far from the equilibrium line.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads ?
Reflux conditions:
(i) Reflux stream is completely liquid and is at its bubble point.
(ii) Reflux stream is below its bubble point.
Condenser and reboiler loads are the same in both the cases.
Reboiler load is the same in both the cases but condenser load is higher in case (ii).
Condenser load is the same in both the cases but reboiler load is higher in case (ii).
Both condensor and reboiler loads are higher in case (ii) as compared to case (i).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
Steady state equimolal counter diffusion occurs in case of
leaching
absorption
binary phase distillation
liquid-liquid extraction
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
JD factor for mass transfer is a function of Reynolds number. Mass transfer by molecular diffusion from a single drop to surrounding still air is given by
Nsh = 2
Nst = 2
Nsc = 2
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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