Transcript Distillation Column ENGR 435 Team Members James Linder

Distillation Column
ENGR 435
Team Members
James Linder
Marc Moss
Corita Suber
Brian Vandagriff
December 1, 1998
Topics of Discussion
• Background
• System Diagram
• Batch Distillation
• Continuous Distillation
• Conclusions
• Questions
Background
• To separate by vaporization
• Binary mixture
• Determine initial composition (BP test)
• Equilibrium diagrams (x,y and x,y,T)
• Two methods: Batch and Continuous
System Diagram
Batch Distillation
Production of vapor by boiling the
liquid mixture to be separated and
condensing the vapors without
allowing any liquid to return to the
still.
Batch Results
E 435 Distillation Column Analysis
Actual
Theoretical
Time (min) Volume (L) Temperature (o C)
0
15
77.509
Time (min) Volume (L) Temperature (o C)
0
15
77.874
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
14.994
14.988
14.983
14.976
14.968
14.961
14.953
14.946
14.939
14.932
14.925
14.918
14.91
14.903
14.896
77.648
77.57
77.646
77.635
77.649
77.649
77.649
77.65
77.691
77.794
77.651
77.75
77.794
77.791
77.792
1.772
3.511
5.216
6.889
8.531
10.142
11.724
13.278
14.804
15
14.74
14.486
14.237
13.993
13.754
13.52
13.291
13.066
12.845
12.817
78.064
78.256
78.451
78.65
78.852
79.057
79.265
79.477
79.693
79.722
Actual Volume Change with Time
15.02
Reboiler Volume (L)
15
14.98
14.96
14.94
14.92
14.9
14.88
0
2
4
6
8
Time (min)
10
12
14
16
Theoretical Volume Change with Time
15.5
Reboiler Volume (L)
15
14.5
14
13.5
13
12.5
0
2
4
6
8
Time (min)
10
12
14
16
Continuous Distillation
Based on the return of part of the
condensate to the still under such
conditions that this returning liquid
is brought into intimate contact with
the vapors on their way to the
condenser.
Continuous Results
Tray
Temperature (o C)
7
64.83
8
65.8
9
66.18
10
68.59
11
69.53
12
74.63
Reboiler
79.45
Xm
0.992
0.932
0.89
0.75
0.69
0.42
0.265
Efficiency (%)
125
54.5
42.9
110
34
89.3
41.2
Conclusions
• Theoretical reboiler volume not
same as actual
• Distillate formed during total reflux
• Possible reflux valve malfunction
• Trays 1-6 below B.P. of methanol
• RTD’s need recalibration