Lec-38-Chap-12-4

Lec-38-Chap-12-4 - Reuters, Dec 1 2009 Ethanol was once...

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Reuters, Dec 1 2009 • “Ethanol was once widely touted as a green fuel, but the industry is now under criticism for diverting a third of the U.S. corn crop away from the food supply. Critics say this will worsen food shortages, raise prices and hurt the poor. Cellulosic ethanol my be a solution. Carbohydrates
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Ethanol as a biofuel • Combustion of ethanol produces energy, CO 2 , H 2 O • Similar to petroluem, but net CO 2 neutral (production of ethanol removes CO 2 from atmos.) 6CO 2 + 6H 2 O + light C 6 H 12 O 6 + 6O 2 C 6 H 12 O 6 2C 2 H 6 O + 2CO 2 + energy/heat C 2 H 6 O + 3O 2 2CO 2 + 3H 2 O + energy/heat • Net reaction: light Æ heat Ethanol as a biofuel Where do we get the ethanol? – Where do we get the glucose? 1. Corn – some argue for many drawbacks 2. Other bio sources? – “switchgrass”? – What are the challenges?
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Carbohydrates: glucose polymerization polymerization + C O H C O H + O C C O H H O H O H O O H O H polymer polymer disaccharide disaccharide polysaccharide polysaccharide
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Lec-38-Chap-12-4 - Reuters, Dec 1 2009 Ethanol was once...

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