Corn Based Ethanol By David Acselrod 4/12/07. Overview Process History Viable Source of Energy...
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Transcript of Corn Based Ethanol By David Acselrod 4/12/07. Overview Process History Viable Source of Energy...
Process
• Cultivation of Corn
• Fermentation
• Distillation (95% Water Free)
• Dehydration (99.9% Water Free)
• Denaturing
)(2)(2)( 2626126 gasCOaqueousOHCaqueousOHC
History• Used as Fuel Since 1908• Gasoline Found to be Cheaper (debatable)• Used as Knock Suppressive 1920s,1930s• Lead Found to be Cheaper (debatable)• 1973 Oil Embargo Renews Interests• Energy Tax Act of 1978, Reformations• Accounts Presently for 3% of US Fuel Use
Viable Source of Energy
• Net Energy Value (NEV)• Inputs
– -Farm Energy– -Corn Transport– -Ethanol Conversion– -Distribution– +Coproducts (primarily animal feed)
• Output– +Combustible Fuel (HHV≈84,000Btu/gal)
Pimentel’s Calculations
• Corn Yields Date from pre 1992
• Values for Energy to Create Fertilizer Come from 1990 Worldwide Values
• Value for Energy Needed to Convert Corn to Ethanol (within plant) date pre 1980
• Assumes all Corn is Irrigated (only 16% is)
• Low Energy Credits for Co-products