Table 1 Structural information and operating conditions used in the proposed process. The tray numbers are counted from the top
From: Energy-efficient recovery of fermented butyric acid using octyl acetate extraction
Variable | Extractor | Dist. Col. I | Dist. Col. II | Dist. Col. III |
|---|---|---|---|---|
Structural | ||||
Tray No. | 32 | 31 | 35 | 48 |
Feed | 1 | 14 | 18 | 14 |
Solvent | 32 | Â | Â | Â |
Recycle | 2 | Â | Â | Â |
Operating | ||||
Pressure (MPa)-top | 0.1 | 0.1 | 0.1 | 0.1 |
Temperature (°C) | ||||
 Overhead | 25 | 141.8 | 100.0 | 130.1 |
 Bottom | 25 | 214.0 | 164.7 | 162.7 |
Feed (kg/h) | 10,000 | 8831 | 343 | 269 |
Solvent (kg/h) | 8501 | Â | Â | Â |
Make-up (kg/h) | 13.0 | Â | Â | Â |
Recycle (kg/h) | 74.0 | Â | Â | Â |
Product (kg/h) | ||||
 Overhead | 8831 | 343 | 74 | 4.0 |
 Bottom | 9744 | 8488 | 269 | 265 |
Reflux (kg/h) | – | 789 | 259 | 296 |
Vap. boil up(kg/h) | – | 7491 | 1284 | 188 |
Cooling duty (MW) | – | − 0.17 | − 0.14 | − 0.03 |
Reboiler duty (MW) | – | 0.56 | 0.14 | 0.02 |
Preheat/cool (MW) | − 0.98 | 0.62 | 0.004 | 0.01 |
Comp. (mass frac.) | ||||
Feed | ||||
 Butyric acid | 0.0267 | 0.0311 | 0.8001 | 0.9849 |
Product | Ovhd | Ovhd | Btm | Btm |
 Butyric acid | 0.0311 | 0.8001 | 0.9849 | 0.9977 |