Elementary Principles 71 - 4.39 (cont'd) b. nH 2 nC2 H2 . =...

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4- 30 4.39 (cont’d) b. n n H CH 2 22 2 2 2 2 H islimitingreactant molH fed molC H fed molC H required (theoretical) excess C H mol fed mol required mol required =<⇒ ⇒⇒ = ×= 15 20 15 10 075 100% 333% .. . % . . c. 41 0 300 24 3600 1000 1 300 2 1 200 1 206 6 × = tonnes C H yr 1 yr days 1 day h 1 h s kg tonne kmolC H kgC H kmolH kmolC H kgH kg H / s 26 2 2 2 2 . . . d. The extra cost will be involved in separating the product from the excess reactant. 4.40 a. 45 4 6 4 125 NH O NO H O 5 lb- mole O react lb- mole NO formed lb- mole O react / lb- mole NO formed 32 2 2 2 +→ + = . b. n n O theoretical 3 2 2O fed 2 2 kmol NH h kmol O kmol NH kmol O excess O kmol O kmol O di bg == ⇒= = 100 5 4 125 40% 140 125 175 . c. 500 17 294 1000 32 3125 3125 106 5 4 ./ . . . . kgNH 1 kmolNH kgNH kmolNH kgO 1 kmolO kmolO O is the limiting reactant 33 3 3 2 2 O NH fed O NH stoich 2 2 3 2 3 b g b g = = F H G I K J < F H G I K J n n n n Required NH 3 : 3125 4 5 250 . . kmolO kmolO 23 2 3 = %excessNH excessNH
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This note was uploaded on 02/27/2012 for the course CHEMICAL E 312 taught by Professor Cheung during the Fall '11 term at The University of Akron.

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