課程名稱︰化學反應工程
課程性質︰必修
課程教師︰吳紀聖
開課學院：工學院
開課系所︰化工系
考試日期（年月日）︰103.04.01
考試時限（分鐘）：120
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
The First Midterm of Reaction Engineering (Class 2)
April 1, 2014 21:30~23:30 化工一
Close book
1. (20%) The gas-phase reaction, A → B + C is carried out isothermally
in a 20 dm^3 constant-colume batch reactor. Twenty moles of pure A is
initially placed in the reactor. The reactor is well mixed. (a) If the
reaction is first order: -rA = k CA, with k = 0.865 min^-1, calculate
the time necessary to reduce the number of moles of A in the reactor
to 0.2 mol. (b) If the reaction is second order: -rA = k CA^2 with
k = 2 dm^3/(mol-min), calculate the time necessary to consume 19.0 mol
of A. (c) If the temperature is 127 ℃, what is the initial total
pressure? What is the final total pressure assuming the reaction goes
to complete.
2. (30%) The exothermic reaction, A → B + C, was carried out
adiabatically and the following data recorded,
X (conversion) 0 0.2 0.4 0.5 0.6 0.8 0.9
-rA (mol/dm^3-min) 10 16.67 50 50 50 12.5 9.09
The entering molar flow rate of A was 300 mol/min. (a) What are the
PFR and CSTR columes necessary to achieve 40% conversion? (b) Over
what range of conversions, would the CSTR and PFR reactor colume be
identical? (c) What is the maximum conversion that can be achieved in
a 10.5 dm^3 CSTR?
3. (20%) The rate laws for the following reactions were obtained at low
temperatures. The reactions are highly exothermic and therefore
reversible at high temperatures. Suggest a rate law of each reaction
at high temperatures.
(a) A → B, -rA = k CA^2
(b) A + 2B → 2D, -rA = k CA^(1/2) CB
k PA PB
(c) A + B → C + D, -rA =