Solucionario de Elementos de ingeniería de las reacciones químicas de Fogler tercera edición

2. '"~
3rd Edition. Solution Manual, Chapter 1
Chapter 1
General: The goal of theseproblems are to reinforce the definitions and provide an
understanding of the mole balancesof the different types of reactors. It lays the
foundation for step 1 of the algorithm in Chapter 4.
Pl-l. This problem might encouragestudents to get in the habit of writing down
what they learned from eachchapter.
Pl-2. Small open-ended question from which one could chooseone or two parts.
Parts (a),(b) or (e)arerecommended.
Pl-3. This problem use Example 1-3 to calculate a CSTR volume. It is straight
forward and gives the student an idea of things to come in terms of sizing
reactorsin chapter4. An alternative to PI-II and PI-12.
Pl-4. Alternative to Pl-3, PI-II, and PI-12. SeePl-3 above.
ProblemsPI-5, PI-6, and PI-7 review the definitions given in the chapter.
. Pl-S. This problem can be assigned to just be read and not necessarily to be
worked. It will give students a flavor of the top selling chemicals and top
chemical companies.
Pl-9. This problem will be useful when the table is completed and the students
can refer back to it in later chapters.Answers to this problem can be found
on ProfessorSusanMontgomery's equipment module on the CD-ROM. See
Pl-17.
Many students like this straight forward problem becausethey seehow CRE
principles can be applied to an everyday example. It is often assignedas an
in classproblem and part (g) is usually omitted.
Problems Pl-ll and PI-12 show a bit of things to come in terms of reactor sizing.
Can be rotated from year to year with PI-3 and PI-4. SeePl-3 above.
Pl-13. Asks for details of operation of an industrial reactor.
Pl-14. Encouragesand requires the student to go outside the text for information
related to CRE.May be a bit early in the text to assignthis problem.
Pl-15. Encouragesand requires using other sourcesto obtain information.
Pl-16. Encouragesusing other sourcesto obtain information.
-
. Pl-17. I strongly recommend this problem be assigned. It can be used in
~ conjunction with Problem Pl-9. Professor Susan Montgomery has done a
c
i-
~ p.1-1
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3. .; 3rd Edition. Solution Manual, Chapter 1 3rd Editi
great job pulling together the material on real reactors in her equipment Alternat
module on the CD-ROM. lr1
pJPI-IS. I always assign this problem so that the students will learn how to use as
POLYMATH/MatLab before needing it for chemical reaction engineering
problems. lime.
AI
Pl-19. As the WWW becomes more developed, it may be more and more prl
important to assign this Problem.
Difficult
CDPl-A Similar to problems 3,4,11, and 12. SJ
~
CDPl-B Points out difference in rate per unit liquid volume and rate per reactor
volume. K
M
Summar~ 0
Solution .Assigned Alternates Difficul~ Iimg. Civen Note th
P1-1 a No
. . Pl-2(b) AA 2(a),2(d),2(e) SF 15 c&d Yes
. Pl-3 AA 3,4,11,12,A. FSF 30 Yes
I Pl-4 AA 3,4,11,12,A FSF 30 Yes
Pl-5 I Yes
PI-6 I Yes
PI-7 I Yes
. PI-8 - ReadOnly SF 5 Yes
PI-9 0 Yes
PI-10 0 FSF 60 Yes
P1-11 AA 3,4,11,12,A FSF 30 Yes
PI-12 AA 3,4,11,12,A FSF 30 Yes
PI-13 I Yes i
Pl-14 SIC No
Pl-15 SIC Partial [
.;
Pl-16 SIC Partial
. Pl-17 SF 45 No
. Pl-1S SF 60 Yes ~
PI-19 I No ~
,CDPI-A AA 3,4,11,12,A FSF 30 ~
CDPI-B I FSF 30 t
Assigneg
,. =Always assigned,AA =Always assignone from the group of alternates, .
0 =Often,I = Infrequently,S= Seldom,G = Graduatelevel iJ
. I
~
p.1-2 ~

4. ~rd Edition, Solution Manual, Chapter 1
.her equipment Alternates
In problems that have a dot in conjunction with AA means that one of the
problem, either the problem with a dot or anyone of the alternates are always
1m how to use assigned.
on engineering
~
Approximate time in minutes it would take a B/B+ student to solve the
lore and more problem.
Qifficult~
SF =Straight forward reinforcement of principles (plug and chug)
FSF=Fairly straight forward (requires some manipulation of equations or an
rateper reactor intermediatecalculation).
IC =Intermediate calculation required
M =More difficult
OE=Somepartsopen-ended.
Solution
Given "Note the letter problems are found on the CD-ROM. For example A = CDPI-A.
No
c&d Yes
Yes Summary Table Ch-1
Yes
4:s Review of Definitions and 1,5,6,7,8,9
s Assumptions
es
Yes Introduction to the CD-ROM 17,18,A
Yes
Yes Make a calculation 10,11,12,13
Yes
Yes Open-ended 14,15,16
Yes
No Straight forward 2(b),3,13
Partial
Partial Fairly straight forward 4,11,12,B
No
Yes More difficult 10
No
f alternates,
p.1-3
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5. ~~
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18
Chapter 1
EJ.:.1 Nosolutionwill begiven.
~
(a) Reactantsmightnotbehotenoughtoreact.
(b) PlotCostvs.Volumeonlog-logpaper.Usethisgraphtogenerateanequationfor
costasafunctionof volume.
In (Cost) Ys.In (Volume)
13
.12 c
i' 11 ~
e fU I:'-" . io
c 10. - 9 Y=0.2901x + 9.4932
8
0 2 4 6 8 10
In (Volume) PI-4
From this we generatetheequation: Cost=13,270(V)°.29
We can usethis equationto fmd thedesiredprices: t
Fora6000gallonreactor: Cost=13,270(6000)°.29=$165,400 .
Fora 15,000gallonreactor: Cost=13,270(15,<xx»0.29=$215,740
(c) V =.!Q.~~~ ln~ L- =300.3dm3
0.23rom 0.001CAo
(d) For ConstantPressure:
rA=~~=~~~=~+~~ IV dt V dt dt V dt ~
dC C IrA =~+- A wtV.cos(wt) ..
dt Vo +VJsin(wt) !ij
(e) He/Shemight not be ableto respondto amalfunctionif he/shebecameinjured,and
. no onewould be thereto cometo his/heraid.
I-Lf