midterm3 2005

midterm3 2005 - Chemical Engineering 140 Midterm #3...

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Chemical Engineering 140 November 21, 2005 Midterm #3 (170) Researchers at the University of Wisconsin-Madison have recently developed an alternative process for producing H 2 for the hydrogen economy 1 . This approach uses renewable resources such as biomass as opposed to nonrenewable resources such as natural gas and petroleum. In this process, glucose (obtained from starch) is first converted to sorbitol, which is then reformed over a platinum catalyst to form hydrogen. Sorbitol is reformed over a Pt/Al 2 O 3 catalyst in a tubular reactor at 498K and 29 bar according to the following stoichiometry. C 6 O 6 H 14(liq) +6H 2 O (liq) → 13H 2(gas) + 6CO 2(gas) where the subscripts “(liq)” and “(gas)” denote liquid and gas states. Water is fed in 10% excess to sorbitol. Conversion of sorbitol in the tubular reactor is 60%. As a side reaction, carbon dioxide and hydrogen readily react to form methane and water. CO
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This note was uploaded on 09/15/2009 for the course CHEM 1 taught by Professor Pines during the Spring '08 term at Berkeley.

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midterm3 2005 - Chemical Engineering 140 Midterm #3...

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