B0/àt = Bl/&t + Ha /At (II.3) Let, F = B0 / Ai; B = B\ / Ai ; Therefore,
The equivalent continuous distillation operation for a short interval of At can now be shown in Figure 4.1.(c).
The component balance:
"new
Bnew B
Note that x' from the current distillation step becomes x'F for the next
"new distillation step. At time, t = 0, x'p =x'B(j. The distillate compositions xlD are estimated using FUG method. Also note that Diwekar (1992, 1995) and Sundaram and Evans (1993a) developed alternative expressions for x' . Diwekar (1992,
"new
1995) describes the method for calculating the top composition (xlD) using modified FUG method. Fenske Equation:
Hengestebeck-Geddes ' Equation:
Summation of fractions and xXD estimation:
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