Feedstock Conversion for Biofuel Production

ms.biomass.org

Feedstock Conversion for Biofuel Production

Feedstock Conversion for Biofuel

Production

Todd French

&

Rafael Hernandez

Dave C. Swalm School of

Chemical Engineering


Sugar Platform

• The sugar platform is completely sold on

producing ethanol

– Wet Milling or Dry Milling

– C 6 H 12 O 6 → 2C 2 H 6 O + 2CO 2

• Starch

– Pros

• Easy to produce ethanol from

Starches

• No loss of Hydrogen

– Cons

• Produce two moles of CO 2 for every

mole of glucose converted to ethanol

• Only produces alternatives to

gasoline


Ethanol Production

Dry Milling vs. Wet Milling

55 % of the Ethanol Production 45 % of the Ethanol Production

• One Bushel of Corn

‣ 30% Distillers Dried Grains

‣ 32 % Ethanol

‣ 29% CO 2


Utilization of the Sugars in

Liginocellulosic Biomass

• Switch Grass Composition

– ~40% Cellulose

– ~25% Hemicellulose

• Hardwood

– ~45% Cellulose

– ~30% Hemicellulose

• Softwood

– ~45% Cellulose

– ~28% Hemicellulose


Lignocellulose

http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookCHEM2.html


Starch vs. Cellulose

http://hyperphysics.phy-astr.gsu.edu/hbase/organic/imgorg/starchcellu.gif


Dilute Acid Hydrolysis

http://www1.eere.energy.gov/biomass/images/chart_hydrolysis_process.jpg


Concentrated Acid

http://www1.eere.energy.gov/biomass/images/chart_process_scheme.jpg


Utilization of the Sugars in

Liginocellulosic Biomass

• Traditional Ethanol

Production using Yeast

– Unmodified Yeast only

ferment hexoses

• Glucose

• Fructose

– Genetically Modified

Microorganisms

• Ferment Pentose to some

extent

• Economical

• Oil Production Using

Microorganisms

Conversion of Hexoses

• Glucose

• Fructose

• Maltose

• Lactose

Conversion of Pentoses

• Xylose

• Ribulose


QUESTIONS

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