Question

Which of the following distillation technique is most suited for separating glycerol from spent-lye in the soap industry?

• A. Fractional distillation
• B. Vacuum distillation
• C. Simple distillation
• D. Steam distillation

Answer 1

The correct option is B Vacuum distillation

Vacuum distillation : It is carried our for compounds which decompose at a temperature below their normal boiling point cannot be distilled at atmospheric pressure. On reducing the external pressure, the liquid will boil at lower temperature.
Examples:
Glycerine can be distilled at ${180}^{\circ }C(B.P.=280°C)$ at lower pressure
Separation of glycerol from spent-lye in soap industries.