Chapter 2: Continous Distillation

Question 1

What is condensation

Answer 1

When vapour turns to liquid

Question 2

Explain the key principle: Latent heat of condensation

Answer 2

🔥 How Does It Happen?
1. Vapour is hot = bcs it contains latent heat energy
2. When vapour touches a cold surface which is cooler than the vapour’s saturation temperature,
vapour loses heat
3. As it loses heat, the vapour condensed
4. This lost heat is called latent heat of condensation — and it’s released to the surface it touched.

Question 3

What does Xf denotes

Answer 3

Mole fraction of MVC of feed

Question 4

Then what does the mole fraction of LVC of feed denotes?

Answer 4

1-Xf

Question 5

Where and when does mass transfer between MVC and LVC occur?

Answer 5

• At each tray or packing
• Vapour contacts liquid and mass transfer of LVC and MVC occurs

Question 6

For top (distillate) and Bottom (bottom liquid), which part contains more MVC and LVC

Answer 6

Top : more MVC cause easy to boil
Bottom: more LVC cause hard to boil

Question 7

What is reflux ratio

Answer 7

quantity of liquid returned to the distillation column to quantity of liquid withdrawn as distillate