Table 3 Structure and operating conditions of the proposed VFAs’ recovery process
From: Eco-efficient recovery of bio-based volatile C2–6 fatty acids
Variable | EX I | SR I | DS I | EX II | AZ I | AZ II | DS II | DS III |
|---|---|---|---|---|---|---|---|---|
Structural | ||||||||
Tray no. | 20 | 43 | 23 | 18 | 14 | 42 | 53 | 52 |
Feed | 1 | 28 | 12 | 1 | 7 | 1 | 22 | 42 |
Solvent | 20 | 18 | ||||||
Operating | ||||||||
Pressure (MPa)—top | 0.12 | 0.12 | 0.12 | 0.12 | 0.12 | 0.12 | 0.12 | 0.12 |
Temp. (°C) | ||||||||
Overhead | 30 | 123 | 104 | 30 | 114 | 105 | 150 | 127 |
Bottom | 30 | 234 | 160 | 30 | 178 | 107 | 184 | 232 |
Feed (kg/h) | 10,000 | 962 | 42.6 | 9960 | 11,531 | 388 | 11,368 | 492 |
Solv. (kg/h) | 920 | 11,363 | ||||||
Prod. (kg/h) | ||||||||
Overhead | 962 | 42.6 | 2.2 | 11,531 | 258 | 274 | 492 | 56.8 |
Bottom | 9960 | 920 | 40.3 | 9906 | 11,368 | 114 | 10,876 | 435/0.2 |
Reflux (kg/h) | 130 | 10 | 95.1 | 388 | 7 | 600 | ||
Vap. boil. (kg/h) | 1657 | 53.1 | 5628 | 286 | 4902 | 1046 | ||
Cool. duty (MW) | 0.03 | 0.006 | 0.05 | 0.07 | ||||
Reb. duty (MW) | 0.12 | 0.007 | 0.50 | 0.17 | 0.38 | 0.08 | ||
Pre./recv. (MW) | 0.04/0.12 | 0.64/1.08 | –/0.01 | 0.3 | ||||
Comp. (mass frac.) | ||||||||
Feed | ||||||||
Acetic acid | 0.005 | 0.004 | 0.099 | 0.005 | 0.005 | 0.073 | 0.004 | 0.093 |
Product | Ovd. | Ovd. | Bot. | Ovd. | Ovd. | Ovd. | Ovd. | Ovd. |
Acetic acid | 0.004 | 0.099 | 0.101 | 0.005 | 0.033 | 0.084 | 0.093 | 0.803 |