7/24/2019 Worksheet 3 Atomic and Molecular Balance

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Names:__________________________CHE112P Worksheet 3:_________ Sec:_____ Atomic and Molecular Balance

Problem Solin!

1" Consider a continuous# stead$%state &rocess in 'hich the (ollo'in!reactions take &lace:

C)H12 * ) H2+ ) C+ * 12 H2C)H12 * H2 C)H1,

-n the &rocess# 2./ mole o( C)H12and 0// moles o( H2+ are (ed into thereactor each hour" he $ield o( H2is ,/"/ and the selectiit$ o( H2relatieto C)H1,is 12"/"

a. Draw the complete diagram.

b. Specify the basis and the amount of the species available.

c. Calculate the mole of Hydrogen gas obtained.

d. Calculate the amount of C6H1obtained.

e. !rite the elemental balances. "#or $tomic %alance &ethod'

f. Calculate the molar (ow rate of all components in the output stream.

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g. !rite the specie balances. "#or &olecular %alance &ethod'

h. Calculate the molar (ow rate of all components in the output stream.

2" Chlorobenene 4C)H.Cl5# is an im&ortant solent and intermediate in the&roduction o( man$ other chemicals# is &roduced b$ bubblin! chlorine !asthrou!h li6uid benene in the &resence o( (erric chloride catal$st" -n anundesired side reaction# the &roduct is (urther chlorinated todichlorobenene# and in third reaction to the dichlorobenene is chlorinatedto trichlorobenene"

he (eed to the chlorinator consists o( essentiall$ &ure benene and atechnical !rade o( chlorine !as 470 't Cl2# the balance !aseousim&urities5" he li6uid out&ut (rom the reactor contains )."/ 't C)H)#32"/ 't C)H.Cl# 2". 't C)H,Cl2# and /". 't C)H.Cl3" he !aseous out&utcontains onl$ HCl and the im&urities that entered 'ith chlorine"

8etermine the &ercenta!e e9cess o( benene# (ractional conersion o(benene# (ractional $ield o( chlorobenene# and the mass ratio o( the !as(eed to the li6uid (eed"

he reactions are:

C)H) * Cl2 C)H.Cl * HClC)H.Cl * Cl2 C)H,Cl2 * HCl

3" C)H,Cl2 * Cl2 C)H3Cl3 * HCl

a. Draw the complete diagram.

b. Specify the basis and the amount of the species available.

c. !rite the specie balances. "#or &olecular %alance &ethod'

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d. Determine the percent e)cess of ben*ene.

e. Calculate the fractional conversion of ben*ene.

f. Calculate the fractional yield of chloroben*ene.

g. Determine the mass ratio of the gas feed to li+uid feed.

h. #or $tomic balance, !rite the elemental balances and complete the materialbalance.