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Chapter:

Distillation

1. Find heat removed by condenser if net heat out of condenser is 25000 J and total moles are 25.

1000 J 10000 J 5000 J 2000 J

1000 J

Heat removed by condenser = net heat out/ net moles out
= 25000 J/ 25
= 1000.

Hint Answer

2. Express reflux ratio

$Express reflux ratio\r\n$

D/F R/D R/W R/F

R/D

The reflux ratio is ratio of reflux(R) to Distillate(D).

Hint Answer

3. Find point P in this enriching section.

$Find point P in this enriching section.\r\n$

Xd/R-1 Xd/R+1 R/Xd-1 R/Xd+1

Xd/R+1

Since intercept obtained from derivation for McCabe method is Xd/R+1.

Hint Answer

4. Look out distribution curve, if line PM is lesser than shown separation is more

$Look out distribution curve, if line PM is lesser than shown separation is more\r\n \r\n Where, x,y are concentrations in mole fractions$

Where, x,y are concentrations in mole fractions

True False

True

The separation will be less. Since distribution curve represents volatility variance.

Hint Answer

5. For a ternary mixture, number of cuts required is_________

1 2 3 4

2

The first two high volatile components are stored in two cuts and low volatile remains in still itself.

Hint Answer

6. Find heat given( in KJ) to feed for flash vaporization process if ratio of residue to distillate is 0.65 and enthalpy of feed, distillate and residue are 500, 800 and 200 KJ/kmol respectively. The feed rate is 100 kmol/hr.

4343 5353 6363 7373

6363

-W/D = (HD-(Hf+Q/f))/ (Hw- (Hf+Q/F))
On apply values, we get 6363 KJ

Hint Answer

7. Ordinary distillation cannot separate Azeotrope.

True False

True

For same vapour pressure (Azeotrope), it is not possible to separate by ordinary distillation for that we need azeotropic or extractive distillation.

Hint Answer

8. Find distillate rate by analysing fractionator given below.

$Find distillate rate by analysing fractionator given below.\r\n$

10 KJ 20 KJ 30 KJ 40 KJ

30 KJ

We have to calculate from n th tray
L*HL + G* Hg = DQ
Q=(50*20 + 40*10)/20 = 30 KJ.

Hint Answer

9. Simple distillation is a___________ process.

Batch Continuous Adiabatic None of the mentioned

Batch

Here, liquid mixture is filled in still for a certain time to attain vapour liquid equilibrium.

Hint Answer

10. If vapour pressure of two components in a binary mixture is same, n it is a________

Isotope Azeotrope Differential boiling point None of the mentioned

Azeotrope

Azeotrope is a mixture with a same boiling point.

Hint Answer

Nexttt

All Chapters

View all Chapter and number of question available From each chapter from Mass-Transfer

Modes and Diffusion

Modes and Diffusion

Interphase Mass Transfer

Interphase Mass Transfer

Equipment for Gas-Liquid Operations

Equipment for Gas-Liquid Operations

Humidification Operations

Humidification Operations

Gas Absorption

Distillation

Liquid Extraction

Liquid Extraction

Drying

Leaching and Mass Transfer Co-efficients

Leaching and Mass Transfer Co-efficients

Diffusion in Solids and Molecular Diffusion in Fluids

Diffusion in Solids and Molecular Diffusion in Fluids

Topics

This Chapter Distillation consists of the following topics

Distillation

Find heat removed by condenser if net heat out of condenser is 25000 J and total moles are 25.

Express reflux ratio

$Express reflux ratio\r\n$

;

Find point P in this enriching section.

$Find point P in this enriching section.\r\n$

;

Look out distribution curve, if line PM is lesser than shown separation is more

$Look out distribution curve, if line PM is lesser than shown separation is more\r\n \r\n Where, x,y are concentrations in mole fractions$

Where, x,y are concentrations in mole fractions

;

For a ternary mixture, number of cuts required is_________

Find heat given( in KJ) to feed for flash vaporization process if ratio of residue to distillate is 0.65 and enthalpy of feed, distillate and residue are 500, 800 and 200 KJ/kmol respectively. The feed rate is 100 kmol/hr.

Ordinary distillation cannot separate Azeotrope.

Find distillate rate by analysing fractionator given below.

$Find distillate rate by analysing fractionator given below.\r\n$

;

Simple distillation is a___________ process.

If vapour pressure of two components in a binary mixture is same, n it is a________

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