Question

The distillation technique most suited for separating glycerol from spent lye in the soap industry is

(a) fractional distillation

(b) steam distillation

(c) distillation under reduced pressure

(d) simple distillation

Answer 1

Correct Option (c) distillation under reduced pressure

Explanation:

Glycerol with high boiling point (290°C) can be separated from spent lye by distillation under reduced pressure. This process is used to purify liquids having very high boiling points, By this process, liquid is made to boil at lower temperature than its boiling point by lowering the pressure on its surface.