BRAINCAKEFractional Distillation
Fractional distillation separates a mixture of miscible liquids whose boiling temperatures are close together. Simple distillation cannot do this well, because the vapour from such a mixture contains a lot of both liquids.
A fractionating column is fitted between the flask and the still head. The column is packed with glass beads or rings, which give a large surface area. There is a temperature gradient up the column: it is hottest at the bottom and coolest at the top.
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More in Alcohols
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- Oxidation Reactions of Alcohols
- Purification by Simple Distillation
- Solvent Extraction
- Drying
- Test for Purity
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All 16 lessons in Alcohols · All Edexcel AS-level Chemistry topics