8/14/2019 CHE 254 1 Homework 11 Chapter 4
1/2
CHE254
Homework11Chapter4
TomBertalan,ChrisBarnes,YangHe,JamesRobinson
[email protected]
4.39
Acetyleneishydrogenatedtoformethane.Thefeedtothe eactorcontai
50mol/mol.r ns 1.
a) Calculate the stoichiometric reactant ratio (mol react/mol
reac) and the yield ratio (kmol formed/kmolreact).
b)
Determinethelimitingreactantandcalculatethepercentagebywhichth
reactantisinexcess.eotherc) Calculate the mass feed rate of
hydrogen (kg/s) required to produce 4 10 metric tons of ethane per
year
assumingthatthereactiongoestocompletionandthattheprocessoperatesfor24hoursaday,300daysayear.
d)
Thereisadefinitedrawbacktorunningwithonereactantinexcessratherthanfeedingreactantsinstoichiometricproportion.What
is it? [Hint: In theprocessofpart (c),whatdoes the
reactoreffluentconsistofandwhatwil
probablyhavetobedonebeforetheproductethanecanbesoldorused?]
8/14/2019 CHE 254 1 Homework 11 Chapter 4
2/2
CHE254
Homework11Chapter4
TomBertalan,ChrisBarnes,YangHe,JamesRobinson
[email protected]
4.47(ac)
Atlowtomoderatepressures,theequilibriumst
ftreactionateofthewatergasshi
is
approximately
described
by
the
relatio
n
0.0247 exp 4020
whereTisthereactortemperature,istheequilibriumconstant,and
isthiemolefractionofthespeciesinthereactorcontentsatequilibrium.
Thefeedtoabatchshiftreactyorcontains20.0mole%,10.0%,40.0%water,andthebalanceaninertgas.Thereactorismaintainedat
1123 .
a)
Assumeabasisof1molfeedanddrawandlabelaflowchart.Carryoutadegreeoffreedomanalysisofthereactorbasedonextentsofreactionanduseittoprovethatyouhaveenoughinformationtocalculatethe
compositionofthereactionmixtureatequilibrium.Donocalculations.
b)
Calculatethetotalmolesofgasinthereactoratequilibrium(ifittakesyoumorethan5secondsyouremissingthepoint)andthentheequilibriummolefractionofhydrogenintheproduct.(Suggestion:Beginbywriting
expressionsforthemolesofeachspeciesintheproductgasintermsoftheextentofreaction,andthenwrite
expressionorthespeciesmolefractions.)
c)
SupposeagassampleisdrawnfromthereactorandanalyzedshortlyafterstartupandthemolefractionofhydrogenIsignificantlydifferentfromthecalculatedvale.Assumingthatnocalculationmistakesor
measurementerrorshavebeenmade,whatisalikelyexplanationforthediscrepancybetweenthecalculated
andmeasured
hydrogen
yields?
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