Page 103 - Applied Process Design For Chemical And Petrochemical Plants Volume II

92 Applied Process Design for Chemical and Petrochemical Plants

Neglect the heavier than perchlor components in the
recufying section.
In order to carry the perchlor it is assumed at 0.0001
mol fraction in overhead and reflux, the P-Tri is reduced
1.4 0 XI co to 0.0005 mol fraction for these calculations being tighter
1.6 0.0768 0.346 29 specifications than the initial calculated balance. The
2.0 0.20 0.445 23.5 overall effect will be small.
3.0 0.40 0.312 18.8
4.0 0.52 0.245 17
00 - - 12.6
These values are plotted in Figure 8-52. From the curve, A 0.9994 975.02 0.9984 545.5 0.9971
the operating (L/D), was selected, and the theoretical B 0.0005 1.00 0.001024 1.0 0.001828
stages corresponding are 19. C 0.0001 0.273 0.000280 0.359 0.000656
L = 976.293 0.999704 546.859
Tray-&Tray Calculation-Ackers and Wa& Method (close
enough)
Rectlfyng Section, (L/D), = 3:l
Light key = Trichlor; Heavy key = fi Tn Typical calculations:
Relative Volatilities to start: Use average of top and feed

"a%
A 2.05
B 1.00
1
C 0.734 1 (3) (0.9994) + 0.9994
(:),=-[ 2.05 (3) (0.0005) 0.0005 = 975.02
+
Component B:
1
3 (0.0005) + 0.0005 = l.oo
3 (0.0005) + 0.0006

Component C:
1
[
(:) = - (0.0003) + 0.0005
1
3 (0.0001) + 0.0001 = o.272
3
0.734
(XA)
1 = 975.02/976.293 = 0.9984
(xB)~ 1.00/976.293 = 0.001024
=
(%)I = 0.273/976.293 = 0.000280
Tray 2: Component A
1
+
3 (0.9984) 0.9994 = 543.5
+
3 (0.00102) 0.0005
Component B
1
3 (0.00102) + 0.0005 = l.oo
+
3 (0.00102) 0.0005
Component C
Reflux Ratio, L/D
3 (0.00028) + 0.0001 = o.359
Figure 8-52. Gilliland Plot for multicomponent Example 8-28. 3 (0.0005) + 0.0005 1