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Quiz 4, F07

# Quiz 4, F07 - 2(wet basis in the product gas leaving the...

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ChE 2114 Fourth Quiz September 28, 2007 1. (30 points) An aqueous sugar solution which is 10.0 mass % sugar is fed to an evaporator which is in series with a second evaporator. The final product leaving the second evaporator is 20.0 mass % sugar. Equal amounts of water are evaporated in each of the two evaporators. What is the mass % sugar in the solution that flows from the first evaporator to the second evaporator? 2. (30 points) When ethane, C 2 H 6 , is combusted in a furnace with 15.0% excess air, there is 100% conversion of the fuel, but both CO 2 and CO are formed. The selectivity is 9 to 1. Desired reaction: C 2 H 6 + 7/2 O 2 2 CO 2 + 3 H 2 O Undesired reaction: C 2 H 6 + 5/2 O 2 2 CO + 3 H 2 O Calculate the mol % O

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Unformatted text preview: 2 (wet basis ) in the product gas leaving the furnace? 3. (40 points) Consider the production of ammonia by the reaction N 2 + 3 H 2 ↔ 2 NH 3 in a system involving recycle and purge. The fresh feed to the process is 1.50 mol % inerts (Ar ) and contains the N 2 and H 2 in stoichiometric proportions. The ammonia product is removed from the cooler/condenser as pure NH 3 and the recycle and purge contain no NH 3 . Given: the fresh feed rate is 100 mols/min the mol % Ar in the recycle is 8.00% (a) (20 points) What is the total molar flow rate for the purge stream? (b) (20 points) What is the overall % conversion for the process?...
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Quiz 4, F07 - 2(wet basis in the product gas leaving the...

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