Environmental Engineering Reference
In-Depth Information
V
0
= 1250 kg/hr
V
0
=1250kg/hr
(
y
A
0
,
y
B
0
)=(0,0.01)
(
y
A
0
,
y
B
0
)=(0,0.01)
O
1
O
0
= 1000 kg/hr
O
2
1
2
(
x
A
0
,
x
B
0
)=(0.7, 0.3)
(
x
A
1
,
x
B
1
)
(
x
A
2
,
x
B
2
)
V
1
V
2
(
y
A
1
,
y
B
1
)
(
y
A
2
,
y
B
2
)
Figure 5.8
Schematic for water-acetic acid-isopropyl ether, Example 5.1.
100
90
80
70
60
50
40
O
0
30
O
1
O
2
20
M
1
10
M
2
V
1
V
2
V
0
0
10
20
30
40
50
60
70
80
90
100
Water (wt%)
Figure 5.9
Cross-flow cascade: water-acetic acid-isopropyl ether, Example 5.1.
Countercurrent cascade (Figure 5.10)
A countercurrent cascade allows for more complete removal of the solute, and the solvent
is reused from stage to stage so that less is needed.
Mass balance
:
O
1
+
V
1
=
O
2
+
V
0
(Stage 1)
∴
V
0
−
O
1
=
V
1
−
O
2
=
;
(5.3)
O
2
+
V
2
=
O
3
+
V
1
(Stage 2)
∴
V
1
−
O
2
=
V
2
−
O
3
=
.
(5.4)
So
represents the difference in flowrates of passing streams between stages. This “delta
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