Solution

The equilibrium data as indicated above are plotted in Fig. C2.1.. Table C2.1 lists the value of Y on the operating line between Yb and Ye, and the corresponding value of Y+.

In Table 7.3 1/(Y-Y+) has been computed. Column 4 in the table is based on Fig. C2.2. and column 5 indicates the corresponding values of (W-Wb)/Wa.

By means of column 6, which shows Y/Yo, Fig. C2.3 is plotted. The total number of transferred units is found in Table C2.1 to be 4.23. It is now possible by use of Fig. C2.3. to find f, as: 0.64.

m ye

g proie

ml"1

/

i-

/

/

y

/

/

/

/

y*

v

/' 3

■ /

m< -

I proti -

ing-i -

20 40 60

Figure C2.1. Equilibrium line and operation line.

Y-Yx

Theoretical column calculations

Y

Y*

1

dY

W-WB

Y

Y - Y*

Y-Y*

WA

Yo~

20

10

0.100

0

0

0.1

30

14

0.063

0.8

0.189

0.15

40

20

0.050

1.35

0.319

0.20

50

24

0.038

1.81

0.428

0.25

60

29

0.032

2.16

0.510

0.30

70

33

0.027

2.47

0.584

0.35

80

39

0.024

2.72

0.643

0.40

90

44

0.022

2.94

0.695

0.45

100

49

0.020

3.14

0.742

0.50

110

53

0.018

3.32

0.785

0.55

120

58

0.016

3.48

0.823

0.60

130

64

0.015

3.63

0.858

0.65

140

68

0.014

3.74

0.884

0.70

150

74

0.013

3.87

0.915

0.75

160

80

0.013

4.00

0.946

0.80

170

85

0.012

4.12

0.974

0.85

180

93

0.010

4.23

1.000

0.90

0 0

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