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DEHYDRATION

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ETHANOL DEHYDRATION and PHASE SEPARATION

  • < DEHYDRATION > 
  • It is necessary to dehydrate ethanol to mix it with gasoline. 
  • Distillation leaves 3 to 5 % water in the ethanol.
  • Of the many forms of dehydration, 3 are used most commonly:
  • < PHASE SEPARATION >
    • When 'water laden' ethanol is blended with gasoline, its water content causes 'PHASE SEPARATION' 
    • This means that ethanol with 3 - 5 % water will act more like water than ethanol when mixed with gasoline.
  • It then seperates out and sets to the bottom of the tank, with all the gasoline ending on top of it
    • This is called 'PHASE SEPARATION'
  • Because of  phase separation we must dehydrate Ethanol before mixing it with gasoline.