step change cut off 40% in reflux percent. delta m = 40%
Post on 20-Dec-2015
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Step Change
• Cut off 40% in Reflux Percent.
• Delta M = 40%
Step Change AnalysisTime versus Reflux Temperature
65
70
75
80
85
90
95
0 2 4 6 8 10 12 14 16
Time (min)
Re
flu
x T
em
pe
ratu
re (
oC
)
Step Change AnalysisTime versus Reflux Temperature
65
70
75
80
85
90
95
0 2 4 6 8 10 12 14 16
Time (min)
Re
flu
x T
em
pe
ratu
re (
oC
)
Delta C = 23.7oC
Step Change AnalysisTime versus Reflux Temperature
65
70
75
80
85
90
95
0 2 4 6 8 10 12 14 16
Time (min)
Re
flu
x T
em
pe
ratu
re (
oC
)
Delta C = 23.7oC
to = 0.28 min
Step Change AnalysisTime versus Reflux Temperature
65
70
75
80
85
90
95
0 2 4 6 8 10 12 14 16
Time (min)
Re
flu
x T
em
pe
ratu
re (
oC
)
Delta C = 23.7oC
to = 0.28 min
0.632deltaC
Step Change AnalysisTime versus Reflux Temperature
65
70
75
80
85
90
95
0 2 4 6 8 10 12 14 16
Time (min)
Re
flu
x T
em
pe
ratu
re (
oC
)
Delta C = 23.7oC
to = 0.28 min
0.632deltaC
t2 = 2.94 min
X,Y vs T diagram for methanol-water
METHANOL-WATER
335
340
345
350
355
360
365
370
375
0 0.2 0.4 0.6 0.8 1
x,y Composition
T (
K)
T50% Reflux
T99.9% Reflux
X,Y vs T diagram for methanol-water
METHANOL-WATER
335
340
345
350
355
360
365
370
375
0 0.2 0.4 0.6 0.8 1
x,y Composition
T (
K)
slope=-109
Slope=-16
X = 0.0585
Step Change Parameters
• to = 0.28 min
• K = (0.0585/40) = 0.00146 composition/%
• Tau = to – t2 = 0.66 min
• EBc = EBt/m = 0.2828/62.5 = 0.00452