Completion of Distillation Lecture Outline.docx

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Completion of Distillation Lecture Outline Azeotropes Mixtures with a fixed composition that cannot be altered by simple or fractional distillation. Will act like a pure compound even though it is a mixture Boiling point will remain constant during distillation Composition of liquid= composition of vapor On the boiling point composition graph the liquid and vapor curves pinch together at the azeotropic composition See Fig. 5.4 for representative graph Can be minimum (below pure boiling points of both liquids) Can be maximum (above pure boiling points of both liquids) List two methods to form 100% ethanol from 95% ethanol: This is an azeotrope? What kind is it? Reaction with calcium oxide Removing water as an azeotrope with another liquid Vacuum Distillation A distillation carried out under reduced pressure Used when neither ordinary distillation not steam distillation is practical For compounds that decompose at boiling points or sensitive to oxidation (something
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  • Fall '08
  • Govindarajoo
  • Distillation, pure boiling points

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