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

Options

A. Fractional distillation
B. Steam distillation
C. Distillation under reduced pressure
D. Simple distillation

Answer

C

Explanation

Glycerol is high boiling liquid with B.P. `290^(@)C`. It can be separated from spent-lye by distillation under reduced pressure. Liquid is made to boil at lower temperature than normal temperature than by lowering pressure on its surface, so external pressure and B.P. of liquid is lowered hence glycerol is obtained wihout decomposition at high temperature.