课程名称︰化学反应工程 课程性质︰必修 课程教师︰吴纪圣 开课学院：工学院 开课系所︰化工系 考试日期（年月日）︰102/6/19 考试时限（分钟）：120 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : 1. The elementary reversible liquid phase reaction, A <--> B, takes place in a CSTR. Pure A enters reactor. (a) Derive an expression of G(T) as a function of heat of reaction, equilibrium constant, rate constant, volumetric flow rate, reactor volume and temperature. (b) Show a sample calculation of G(T) at T = 400 K. 2. The first order irreversible exothermic liquid phase reaction, A --> B, is to be carried out in a jacketed CSTR. Species A and inert I are fed to the reactor in equimolar amounts. The molar feed rate of A is 80 mol/min. What is the reactor temperature for a feed temperature (T0) of 450 K? Additional information: ΔHrx = -7500 cal/mol, CpA = CpB = 20 cal/mol-K, CpC = 30 cal/mol-K, k = 0.0066 1/min @ 350 K Ea = 40000 cal/mol, coolant temperature Ta = 300 K UA = 8000 cal/min-K 3. Describe the behavior of conversions (X) abd equilibrium conversions (Xe) aling the volume in a PFR with heat exchanger (the second row of Fig. 1). T: temperature, Ta: coolant temperature, T0: feed temperature 4. The combination of ideal reactors are used to model real reactors. Please draw a combination of PFRs and CSTRs (and/or a recycle system) to describe the RTDs shown in Fig. 2. 5. The elementary steps of a reaction A + B ==> C + D are followings. Derive the rate equations. (a) The surface reaction is the rate limiting step. (b) The desorption of C is rate limiting step. A + S --> AS (adsorption) B + AS + S --> CS + DS (irreversible surface reaction) CS --> C + S (desorption) DS --> D + S (desorption) ====== Figure 1 : http://ppt.cc/KW60 Figure 2 : http://ppt.cc/~Cdt ======= Design equations: CSTR : V = FA0 (Xout - Xin ) / (-rA)out PFR : FA0 dX/dV = -rA G(T) = (-ΔHrx) (-rA*V/FA0) = (-ΔHrx)(X) Tc = (T0*FA0*Cp0 + U*A*Ta)/ (UA + Cp0*FA0) = (kTa+T0)/(k+1) Gas constant : R = 8314 Pa-L/mol-K = 1.987 cal/mol -- 夜饮东坡醒复醉，归来彷佛三更。家僮鼻息已雷鸣，敲门都不应，倚杖听江声。 长恨此身非我有，何时忘却营营？夜阑风静縠纹平，小舟从此逝，江海寄余生。 --

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