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Chemical Engineering - Mass Transfer - Discussion

Discussion Forum : Mass Transfer - Section 2 (Q.No. 6)
Mass Transfer
6.
Pick out the correct statement.
Ponchan-Savarit method is more accurate than McCabe-Thiele method to determine the number of theoretical stages required for the separation of non-ideal binary system by distillation.
A sharp decrease in pressure drop is an indication of flooding in a distillation coloumn.
Solvent used in extractive distillation should be of high volatility.
Flash distillation is suitable for separating components which have very close boiling temperature.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
3 comments Page 1 of 1.
Amit Kumar said:   3 years ago
I think the Right answer is B.
KRR said:   3 years ago
Weeping (caused by low vapour flow) is indicated by a sharp pressure drop in the column and reduced separation efficiency.

Flooding (caused by excessive vapour flow) is detected by sharp increases in column differential pressure and significant decrease in separation efficiency.
Lekhanandu said:   1 decade ago
This is because Ponchan-Savarit method takes energy balance of the system into account which is not considered in McCabe-Thiele method because of this the dew point bubble point curves are not straight and the latent heat of vapourisation is not a constant.
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