Research Article
Design of Batch Distillation Columns Using Short-Cut Method at Constant Reflux
Table 2
Actions and equations used in batch distillation column operating at constant reflux.
| Step | Action | Sundaram-Evans | Diwekar-Madhavan |
| 0 | Data needed | (a) | |
| 1 (Used to begin the cycles) | Using as number of stages, estimate molar fraction of reference component at distillate () | (b) = heaviest component | |
| 2 (Used to begin the cycles) | Calculate molar fraction of nonreference component at distillate | (c) Fenske: | (d) Hengstebek-Geddes: |
| 3 | Stepping forward in time and calculating new molar mass at bottom and new molar fraction of all components |
(e) | |
(f) | |
| 4 | With Gilliland (Eduljee) and Underwood, solve simultaneously for and |
(g)
| | (h) | |
| 5 | With the new value of , estimate the molar fraction of the reference component at distillate | (i) | |
| 6 | With the new value of , calculate molar fraction of nonreference component at distillate | (j) | |
| 7 | Repeat steps 3 to 6 for several cycles. | | |
| 8 | Stop | | |
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