Distillation of Binary Mixtures

This is an MCQ-based quiz on the topic of Distillation of Binary Mixtures.

This includes the following:-

McCabe-Thiele Graphical Method for Trayed Towers
Rate-Based Methods for Packed Distillation Columns

Start Quiz

What is the goal of distillation?

To produce a distillate rich in light key and the bottoms product rich in high key To produce a distillate rich in high key and the bottoms product rich in light key To produce a distillate rich in light key and the bottoms product rich in light key To produce a distillate rich in high key and the bottoms product rich in high key

What is meant by light key (LK)?

A feed that contains less volatile components A feed that has less mass A feed that has higher concentration of less molecular weight solute A feed that contains more volatile components

What is meant by high key (HK)?

A feed that contains less volatile components A feed that has less mass A feed that has higher concentration of less molecular weight solute A feed that contains more volatile components

If LK=1 and HK=2, what is the formula for α 1,2 ?

α 1,2 =K1/K2 α 1,2 =K1*K2 α 1,2 =K1-K2 α 1,2 =K1+K2

For what value of α1,2 ,the separation cannot be achieved?

0.8 1.2 1.3 1.8

What is the formula for distillation rate according to mcCabe-thiele’s method?

D= F(z F – x B )/(x D + x B ) D= F(z F – x B)/(x D /x B ) D= F(z F – x D )/(x D – x B ) D= F(z F – x B )/(x D – x B )

What is λ= KV/L replaced by since the line for distillation is curved?

λ= mV/L λ= MVL λ= mL/V λ= mV/K

Which method uses McCabe-thiele diagram?

HETP method HTU method Ponchon-Savarit method HODL method

What happens when k x >k y ?

Resistance to mass transfer is mainly in vapor Resistance to mass transfer is mainly in liquid phase Resistance to mass transfer is mainly in solid phase All the resistances are equal

In which solution are the values of HTU and HETP constant?

Concentrated solution True solution Homogeneous solution Dilute solution

What is HETP if H OG = 1.5ft and λ=01.5?

1.23 1.43 1.65 1.78

What is the distillation rate if feed rate is 4moles/s and mole fraction of LK in feed is 0.7, and mole fraction of LK in distillate and bottom is 0.5, 0.4?

8 moles/s

12 moles/s

16 moles/s

20 moles/s

What is the distillation rate if feed rate is 20moles/s and mole fraction of LK in feed is 0.8, and mole fraction of LK in distillate and bottom is 0.5, 0.4?

80 moles/s

12 moles/s

16 moles/s

20 moles/s

What is the distillation rate if feed rate is 9moles/s and mole fraction of LK in feed is 0.7, and mole fraction of LK in distillate and bottom is 0.5, 0.3?

45 moles/s

16 moles/s

18 moles/s

20 moles/s

What is the distillation rate if feed rate is 31moles/s and mole fraction of LK in feed is 0.9, and mole fraction of LK in distillate and bottom is 0.6, 0.4?

23 moles/s

26 moles/s

28 moles/s

31 moles/s

Quiz/Test Summary

Title: Distillation of Binary Mixtures

Questions: 15

Contributed by: