Post on 20-Dec-2015
Batch Distillation
John Ozbek
Murat Ozkaya
11/25/08
Outline
Introduction Without Rectification
– System Diagram– Experimental Data– Material Balance– Results
With Rectification– System Diagram– Experimental Data– Material Balance– Results
Conclusion
Introduction
Batch Distillation 1 L of Ethanol-H2O @ Azeotrope
9 L of H2O Re-Boiler Power @ 1500W
System Diagram Experimental Data Material Balance Results
Without Rectification
REBOILER
nTotal = 518 molesxEtOH = 0.032 mol/mol
COLUMN
D (moles)
xD (mol EtOH/mol)
Q = 1500 W
System Diagram
CONDENSER Q
Batch Distillation No Reflux
20
30
40
50
60
70
80
90
100
30 35 40 45 50Time (minutes)
Tra
y T
em
pe
ratu
re (
de
g-C
)
Tray 1 T
Reboiler TT = 81 oC
Experimental Data
T-xy Diagram of Ethanol (A) and Water (B)
78.0
80.0
82.0
84.0
86.0
88.0
90.0
92.0
94.0
96.0
98.0
100.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0xA, yA
T (
oC
)
xD=0.350
Material Balance
4.47
)350.0(0320.0518
D
D
Dxxn DEtOHTotal
moles
Results
Distillate Liquid Ethanol Composition = 0.350
The Time Required for the Process to Reach that Composition was around 50 min.
With Rectification
System Diagram Experimental Data Material Balance Results
System Diagram
REBOILER
nTotal = 518 molesxEtOH = 0.032 mol/mol
COLUMN
Q = 1500 W
D (moles)
xD (mol EtOH/mol)
CONDENSER Q
Experimental Data
Batch Distillation Changing Reflux
78
79
80
81
40 70 100 130
Time (minutes)
Tra
y T
emp
erat
ure
(deg
-C)
Tray 1 T
Tray 2 T
Tray 3 T
Tray 4 T
Tray 5 TT = 79.1 oC
T-xy Diagram of Ethanol (A) and Water (B)
78.0
80.0
82.0
84.0
86.0
88.0
90.0
92.0
94.0
96.0
98.0
100.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0xA, yA
T (
oC
)
xD=0.600
Material Balance
6.27
)600.0(0320.0518
D
D
Dxxn DEtOHTotal
moles
Results
Distillate Liquid Ethanol Composition = 0.600
The Time Required for the Process to Reach that Composition was around 120 min.
Conclusions
Reflux vs. Time
0
10
20
30
40
50
60
70
80
90
100
Time (min)
WithReflux
0%Reflux
Reflux vs. Purity
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Distillate Purity
0%Reflux
With Reflux
Conclusion
Reflux increases the time of the distillation process while increasing distillate purity.