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mech5970-s11-ch12-hw-solns

# mech5970-s11-ch12-hw-solns - MECH 5970/6970 Spring 2011...

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MECH 5970/6970 Spring 2011 Intermediate Special Topics in Mechanical Engineering Renewable Energy Resources and Applications Biomass Text Problems 1. How much ethanol can be produced from a ton of glucose? The conversion reaction is C 6 H 12 O 6 2 C 2 H 5 OH + 2 CO 2 Molecular masses are: M G = 180 . 6 kg/kmol, M E = 46 . 1 kg/kmol. The mass of ethanol per mass of glucose is therefore m E m G = 2 M E M G = 0 . 51 or 0.51 tons of ethanol per ton of glucose. 2. How much methanol can be made from a ton of methane via the following reaction chain: CH 4 + H 2 O CO + 3 H 2 H 2 + CO 2 H 2 O + CO CO + 2 H 2 O CH 3 OH + O 2 The error in the third reaction, appearing in the text, has been corrected. The CO produced in the first reaction is converted to a methanol by the third. And the three H 2 produced in the first can be converted to three CO via the second, and the three CO converted to three CH 3 OH by the third. The three reactions will therefore produce four methanols for each methane; this information is enough to complete the problem once the molecular masses are brought in.

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mech5970-s11-ch12-hw-solns - MECH 5970/6970 Spring 2011...

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