化学反应工程作业.docx

1、化学反应工程作业The Final Examination ofChemical Reaction Engineering Used by graduate students of 2010 2011-6 Name: Class: Grade: Student Number:1: For a gas reaction at 400 K the rate is reported as (a)What are the units of the rate constant?(b)What is the value of the rate constant for this reaction if t

2、he rate equation is expressed as 2: For the elementary reactions in seriesfind the maximum concentration of R and when it is reached.3: Given a gaseous feed, T0=1000 K, 0=5 atm, CA0=100, CB0=200, T=400 K, =4 atm, CA=20. Find XA, XB, CB.4: A gaseous feed of pure A (1 mol/liter) enters a mixed flow re

3、actor (2 liters) and reacts as follows: Find what feed rate (liter/min) will give an outlet concentration CA=0.5mol/lliter.5: The kinetics of the aqueous-phase decomposition of A is investigated in two mixed flow reactors in series, the second having twice the volume of the first reactor. At steady

4、state with a feed concentration of 1mol A/liter and mean residence time of 96 sec in the first reactor, the concentration in the first reactor is 0.5 mol A/liter and in the second is 0.25 mol A/liter.Find the kinetic equation for the decomposition.6: T is the desired product and CA0=5.Under ultravio

5、let radiation, reactant A of CA0=10 kmol/m3 in a process stream (v=lm3/min) decomposes as follows.We wish to design a reactor setup for a specific duty. Sketch the scheme selected, and calculate the fraction of feed transformed into desired product as well as the volume of reactor needed.7: When oxy

6、gen is bubbled through a high-temperature batch of A-containing liquid material, A oxidizes slowly to give a slowly decomposing intermediate X and final product R. Here are the results of an experiment:We have no way of analyzing for X; however, we are safe in assuming that at any time CA+CR+CX=CA0.

7、What can we say about the mechanism and kinetics of this oxidation? Hint: plot the data and examine the plot.8: Phthalic Anhydride from Naphthalene. The accepted mechanism for the highly exothermic solid catalyzed oxidation of naphthalene to produce phthalic anhydride isand whereA=naphthalene (react

8、ant)R=naphthaquinone (postulated intermediate)S=phthalic anhydride (desired product)T=CO2+H2O (waste products)and the Arrenhius activation energy is given in units of J/mol. This reaction is to be run somewhere between 900 K and 1200 K.A local optimum reactor setup discovered by the computer see exa

9、mple1, Chem. Eng. Sci., 49, 1037-1051(1994) l is shown in Fig.P10.19.Figure P10.19(a) Do you like this design? Could you do better? If so, how ?(b)If you could keep the whole of your reactors at whatever temperature and 7 value desired, and if recyle is allowed, how much phthalic anhydride could be produced per mole of naphthalene reacted?Suggestion: Why not determine the values of k1, k2, k3,and k4, for both extremes of temperature, look at the values, and then proceed with the solution?