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Why is impure glycerol purified by disti...

Why is impure glycerol purified by distillation under reduced pressure?

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The boiling point of glycerol is 563K under normal pressure and it undergoes decomposition below this temperature. Thus, simple distillation cannot be used for its purification. Under a reduced pressure of 12 mm Hg, the boiling point of glycerol is reduced and then at 453 K it can be distilled without getting decomposed.
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