Distillation ...
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PA 0XA+PB
PA 0–PB
PA 0–PB
And PT=XTPT 0=YTP.
Itnowremainstoestimatethesaturationvaporpressureasafunctionoftemperature,
0 XT XB+XT
0.9644
1.0233
1.0081
1.0021
0.9992
As0.0995isnearenoughto1.000,thenearpointmaybetakenas372.0K
Oneofthemostwidelyusedcorrelationsofsaturatedvaporpressureisproposedby
Antoine
P 42.305
So m-1 (m-1)xo+c
y–x = S m-1
y0–x0 S0 …………………………..2
V V
V f
diagram,theliquidtemperaturewhenx=0.42isseentogive366.5k
39
0
38
0
37
0
36
:Vn+1Yn+1+Ln-1Xn-1=VnYn+LnXn……………..2
Refluxratio(R)=L(from thecondenser)
Assumingconstantmolaroverflow,massflowratesareconstant.
D,xD
Vn+1Yn+1=LnXn+DXD…...................................................2
V.f Yn+1=Ln/Vn+1Xn+D/Vn+1XD………………...3a
Equation3aistheoperatinglineequationforthetopsectionofthedistillationcolumn.
Refluxratio(R)=L/D
Equation3cistheoperatinglineequationfortherectifyingsection
Lm Xm
m m
m +1
LmXm =Vm+1Ym+1+BXB…………………....5
Ym+1=Lm/Vm+1Xm –B/Xm+1XB……….....6a
ButVm+1=Lm –B
Equation3
Equation6
Vapor+liquid(o <q<1)
Yn*–Yn+1
Yn*–Yn+1
Yn+1=4/5Xn+0.19
PA 0–PB
PA 0–PB
And PT=XTPT 0=YTP.
Itnowremainstoestimatethesaturationvaporpressureasafunctionoftemperature,
0 XT XB+XT
0.9644
1.0233
1.0081
1.0021
0.9992
As0.0995isnearenoughto1.000,thenearpointmaybetakenas372.0K
Oneofthemostwidelyusedcorrelationsofsaturatedvaporpressureisproposedby
Antoine
P 42.305
So m-1 (m-1)xo+c
y–x = S m-1
y0–x0 S0 …………………………..2
V V
V f
diagram,theliquidtemperaturewhenx=0.42isseentogive366.5k
39
0
38
0
37
0
36
:Vn+1Yn+1+Ln-1Xn-1=VnYn+LnXn……………..2
Refluxratio(R)=L(from thecondenser)
Assumingconstantmolaroverflow,massflowratesareconstant.
D,xD
Vn+1Yn+1=LnXn+DXD…...................................................2
V.f Yn+1=Ln/Vn+1Xn+D/Vn+1XD………………...3a
Equation3aistheoperatinglineequationforthetopsectionofthedistillationcolumn.
Refluxratio(R)=L/D
Equation3cistheoperatinglineequationfortherectifyingsection
Lm Xm
m m
m +1
LmXm =Vm+1Ym+1+BXB…………………....5
Ym+1=Lm/Vm+1Xm –B/Xm+1XB……….....6a
ButVm+1=Lm –B
Equation3
Equation6
Vapor+liquid(o <q<1)
Yn*–Yn+1
Yn*–Yn+1
Yn+1=4/5Xn+0.19
