Question

The distillation technique most suited for separating glycerol from spent-lye in the soap industry is :(a) Steam distillation.(b) Distillation under reduced pressure.(c) Simple distillation(d) Fractional distillation

Answer 1

option c is correct

Glycerol is high boiling liquid with boiling point 290°C. It can be separated from spent lye by the method of distillation. In this method, liquid is made to boil at lower temperature than its normal temperature by lowering the pressure on its surface. So if the external pressure is reduced, then the boiling point of the liquid is lowered.