cheme140-fall05-mt3-Radke-soln

cheme140-fall05-mt3-Radke-soln - Chemical Engineering 140...

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Chemical Engineering 140 November 21, 2005 Midterm #3 Exam 3 0 5 10 15 20 25 30 35 1-34 34-51 51-68 68-85 85- 102 102- 119 119- 136 136- 153 153- 170 Points Possible: 170 Avg = 82 StdDev = 29.9 High = 151 INSTRUCTIONS FOR REGRADES: Requests for regrades must be submitted in writing to one of the GSI’s by FRIDAY, DECEMBER 2. Please photocopy your exam and explain on this copy specifically (circles and arrows are helpful in addition to words) what you want addressed. Submit both the copy and original to your GSI.
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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. Sorbitol is the limiting reactant. The r eaction is run with 10% excess water. 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 2(gas) + 4H 2(gas) → CH 4(gas) + 2H 2 O (gas) The effluent of the reactor is sent to a flash tank where a vapor phase and liquid phase exit in equilibrium .
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