chemicalreactionengineering3ededition作者octaveLevenspiel课后习题标准答案Word文件下载.docx

1、32,000 m3/dayTreatment plant Clean water 200 mg O2needed/literMean residencetime =8 hr Zero O2 neededFigure P1.1Solution:1.2 Coal burning electrical power station. Large central power stations （about 1000 MW electrical） using fluiding bed combustors may be built some day （see Fig.P1.2）. These giants

2、 would be fed 240 tons of coal/hr （90% C, 10%H2）, 50% of which would burn within the battery of primary fluidized beds, the other 50% elsewhere in the system. One suggested design would use a battery of 10 fluidized beds, each 20 m long, 4 m wide, and containing solids to a depth of 1 m. Find the ra

3、te of reaction within the beds, based on the oxygen used.Chapter 2 Kinetics of Homogeneous Reactions2.1 A reaction has the stoichiometric equation A + B =2R . What is the order of reaction? Because we dont know whether it is an elementary reaction or not, we cant tell the index of the reaction.2.2 G

4、iven the reaction 2NO2 + 1/2 O2 = N2O5 , what is the relation between the rates of formation and disappearance of the three reaction components? 2.3 A reaction with stoichiometric equation 0.5 A + B = R +0.5 S has the following rate expression-rA = 2 C0.5 ACB What is the rate expression for this rea

5、ction if the stoichiometric equation is written as A + 2B = 2R + S No change. The stoichiometric equation cant effect the rate equation, so it doesnt change.2.4 For the enzyme-substrate reaction of Example 2, the rate of disappearance of substrate is given by-rA = , mol/m3s What are the units of the

6、 two constants?2.5 For the complex reaction with stoichiometry A + 3B 2R + S and with second-order rate expression -rA = k1AB are the reaction rates related as follows: rA= rB= rR? If the rates are not so related, then how are they related? Please account for the sings , + or - .2.6 A certain reacti

7、on has a rate given by -rA = 0.005 C2 A , mol/cm3min If the concentration is to be expressed in mol/liter and time in hours, what would be the value and units of the rate constant?2.7 For a gas reaction at 400 K the rate is reported as - = 3.66 p2 A, atm/hr （a） What are the units of the rate constan

8、t? （b） What is the value of the rate constant for this reaction if the rate equation is expressed as -rA = - = k C2 A , mol/m3（a） The unit of the rate constant is （b） Because its a gas reaction occuring at the fined terperatuse, so V=constant, and T=constant, so the equation can be reduced to So we

9、can get that the value of 2.9 The pyrolysis of ethane proceeds with an activation energy of about 300 kJ/mol. How much faster the decomposition at 650 than at 500?2.11 In the mid-nineteenth century the entomologist Henri Fabre noted that French ants （garden variety） busily bustled about their busine

10、ss on hot days but were rather sluggish on cool days. Checking his results with Oregon ants, I find Running speed, m/hr5370Temperature, 1316222428 What activation energy represents this change in bustliness?Suppose , so intercept-3.1780-3.1135-2.7506-2.5017-2.27523.49473.45843.38813.36533.3206-y = -

11、5147.9 x + 15.686Also , intercept = 15.686 ,Chapter 3 Interpretation of Batch Reactor Data3.1 If -rA = - （dCA/dt） =0.2 mol/litersec when CA = 1 mol/liter, what is the rate of reaction when CA = 10 mol/liter?Note: the order of reaction is not known. Information is not enough, so we cant answer this k

12、ind of question.3.2 Liquid a sedomposes by first-order kinetics, and in a batch reactor 50% of A is converted in a 5-minute run. How much longer would it take to reach 75% conversion? Because the decomposition of A is a 1st-order reaction, so we can express the rate equation as:We know that for 1st-order reaction, , So equ（1） equ（2）So 3.3 Repeat the previous problem for second-order kinetics. We know that for 2nd-order reaction, ,So we have two equations as fol