Thus, the minimum number of plates = 7.5, say 8.
11.7.7. Relation between reflux ratio and number of plates
Gilliland(30) has given an empirical relation between the reflux ratio R and the number of plates n, in which only the minimum reflux ratio Rm and the number of plates at total reflux nm are required. This is shown in Figure 11.42, where the group [(n + 1) — (nm + 1)]/(n + 2) is plotted against (R — Rm)/(R + 1).
Gilliland(30) has given an empirical relation between the reflux ratio R and the number of plates n, in which only the minimum reflux ratio Rm and the number of plates at total reflux nm are required. This is shown in Figure 11.42, where the group [(n + 1) — (nm + 1)]/(n + 2) is plotted against (R — Rm)/(R + 1).
Example 11.18
Using the data of Example 11.17, investigate the change in n with R using Figure 11.42. It may be assumed that Rm = 0.83 and (nm + 1) = 8.5
Solution
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