Flashcards in Making Ethanol Deck (13):
How is alcohol made from Renewable raw materials?
What is Fermentation?
Ethanol and Carbon Dioxide are produced from glucose solution using enzymes from yeast
What are the conditions for Fermentation?
Pressure = Normal atmospheric pressure
Temperature = 35 degrees
Enzyme = Yeast
Why is Fermentation carried out at 35 degrees?
Yeast cells become inactive if the temp. is too low and enzymes become denatured at 50 degrees
How is Alcohol made from Non-renewable materials?
Hydration of Ethene
How is Ethene obtained?
Crude Oil (non-renewable)
What are the conditions used for the Hydration of Ethene?
Temperature = 300 degrees
Pressure = 60 atmospheres
Catalyst = Phosphoric Acid
What is the difference in cost between Fermentation and Hydration?
Fermentation = Low cost
Hydration = High cost
What is the difference in conditions between Fermentation and Hydration?
Fermentation = Moderate pressure and temp.
Hydration = high temp. and pressure
What is the difference in energy requirements between Fermentation and Hydration?
Fermentation = Low energy requirements
Hydration = high energy requirements
What is the difference in rate of reaction between Fermentation and Hydration?
Fermentation = Low rate of reaction
Hydration = high rate of reaction
What is the difference in percentage yield between Fermentation and Hydration?
Fermentation = low (15%)
Hydration = High (95%)