pset06 - Homework 6 10.37 Spring 2007 Due Wednesday, March...

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Homework 6 10.37 Spring 2007 Due Wednesday, March 21 Problem 1 : Quoting from the Wilmington, DE Morning News , Aug. 3, 1977: “Investigators sift through the debris from blast in quest for the cause [why the new chemical plant exploded]. A company spokesman said it appears… likely that the [fatal] blast was caused by [rapid decomposition of] … ammonium nitrate [NH 4 NO 3 ] used to produce nitrous oxide [N 2 O].” In the process, a T=200 o F aqueous solution, 83 wt% ammonium nitrate, is fed into a CSTR. When the process is running normally at steady state, about 140 kg/hr of the aqueous solution is injected, and the temperature in the reactor, T R , is 510 o F. At this temperature, the water evaporates rapidly, but the molten ammonium nitrate remains in the CSTR, slowly decomposing by this reaction: NH 4 NO 3 (liquid) Æ N 2 O(g) + 2 H 2 O(g) k(T=510 o F) = 0.307/hour H rxn (T=510 o F) = -740 kJ/kg of ammonium nitrate Note that it takes about 2.2 MJ to convert a kg of liquid water at 200
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pset06 - Homework 6 10.37 Spring 2007 Due Wednesday, March...

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