Question

Why we use fractional column in fractional distillation? ​

Answer 1

Answer:

Fractionating columns help to separate the mixture by allowing the mixed vapors to cool, condense, and vaporize again in accordance with Raoult's law. ... In a typical fractional distillation, a liquid mixture is heated in the distilling flask, and the resulting vapor rises up the fractionating column (see Figure 1).

Answer 2

Answer:

Since the boiling point of nitrogen and oxygen are very close to each other, hence, fractional distillation is used to separate the components of liquid air. The difference in the boiling point of nitrogen and oxygen is less than 20°C . Hence, simple distillation technique cannot be used to separtae the components of liquid air.