Question:

Glycerol is separated in soap industries by :

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Glycerol has a very high boiling point and decomposes if heated to it.
Updated On: Nov 5, 2026
  • Fractional distillation
  • Distillation under reduced pressure
  • Differential extraction
  • Steam distillation
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The Correct Option is B

Solution and Explanation

In soap manufacture glycerol is left in the spent lye. Its boiling point (563 K) is very high and it decomposes near that temperature.
Lowering the pressure lowers its boiling point, so it can be distilled without decomposition. Hence distillation under reduced pressure is used.
Answer: (2) Distillation under reduced pressure
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