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JEE Main · 2020 · 03 Sep 2020 · Shift 1 · Chemistry in Everyday Life

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Glycerol is separated in soap industries by:
  1. (A)Differential extraction
  2. (B)Fractional distillation
  3. (C)Distillation under reduced pressure✓ Correct
  4. (D)Steam distillation

Answer: (C)

Solution

The glycerol freed during saponification boils high, around C, and would decompose if heated to that temperature at ordinary pressure. Distilling under reduced pressure lowers its boiling point so it can be separated from the spent lye without breaking down; glycerol is thus recovered by distillation under reduced pressure.

JEE Main · 2020 · 03 Sep 2020 · Shift 1 · Single correct option

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