Production of ethanol

• 4 uses of ethanol

  Drinks

  Chemical feedstock

  Solvent

  Fuel
• How is ethanol made from ethene

  Reacted with steam at high temp, high pressure and with a phosphoric acid catalyst
• Word equation for the reaction of making ethanol from ethene

  Ethene + water —> ethanol
• Pros of making ethanol from ethene

  Cheap

  Efficient
• Cons of making ethanol from ethene

  Made from crude oil which is non-renewable
• Fermentation

  Anaerobic respiration of sugars by yeast cells to produce ethanol and carbon dioxide
• Word equation for the reaction of making ethanol by fermentation

  Glucose —> ethanol + carbon dioxide
• Conditions for fermentation

  Glucose for yeast to respire

  Yeast

  30-40°C

  Anaerobic conditions (no oxygen)
• Pros of making ethanol by fermentation

  Glucose is renewable and yeast is easy to grow
• Cons of using fermentation to make ethanol

  Can be slow and the ethanol isn’t pure so much be distilled by fractional distillation
• Why are temperatures of 30-40° C used when making ethanol by fermentation

  Catalysed by enzymes so that’s the optimum temperature for them to function