Table 2
Operating conditions and results of the design of experiments and phase compositions in the experimental design (W1: neutral oil; W2: Free fatty acids content; W3: solvent content (water + ethanol)).
| Operating conditions | Measures | Extraction yield | Initial mixture | Oil-rich phase | Alcohol-rich phase | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Test No | Ethanol content in solvent (% wt.) | Initial FFA content (% OA eq.) | O/S ratio (g/g) | Acidity of distillated oil in the oil-rich phase (% OA eq.)  |
FFA extraction yield (%) tFFA | Neutral oil losses (%) tNO | W1 | W2 | W3 | W1 | W2 | W3 | W1 | W2 | W3 |
| 1 | 80.0 | 7.6 | 0.50 | 4.1 | 48.4 | 0.9 | 30.82 | 2.52 | 66.67 | 89.85 | 3.82 | 6.33 | 0.44 | 1.85 | 97.72 |
| 2bis | 80.0 | 11.7 | 0.75 | 7.5 | 39.3 | 0.3 | 37.83 | 5.01 | 57.16 | 85.23 | 6.87 | 7.90 | 0.17 | 3.54 | 96.29 |
| 2 | 80.0 | 11.7 | 1.00 | 7.9 | 35.2 | 0.2 | 44.19 | 5.86 | 49.96 | 84.17 | 7.24 | 8.59 | 0.22 | 4.33 | 95.44 |
| 3 | 80.0 | 7.6 | 1.00 | 5.2 | 33.1 | 0.4 | 46.19 | 3.77 | 50.03 | 89.16 | 4.89 | 5.95 | 0.40 | 2.58 | 97.02 |
| 4 | 80.0 | 3.1 | 0.75 | 2.3 | 26.2 | 0.8 | 41.48 | 1.32 | 57.20 | 92.90 | 2.20 | 4.91 | 0.58 | 0.62 | 98.80 |
| 5 | 87.8 | 3.1 | 0.50 | 1.3 | 58.5 | 1.5 | 32.31 | 1.03 | 66.66 | 92.81 | 1.24 | 5.95 | 0.73 | 0.91 | 98.36 |
| 6 | 87.8 | 11.7 | 0.50 | 5.4 | 58.2 | 2.3 | 29.43 | 3.90 | 66.67 | 85.97 | 4.87 | 9.16 | 1.00 | 3.41 | 95.59 |
| 7 | 87.8 | 11.7 | 1.00 | 6.5 | 48.0 | 0.4 | 44.19 | 5.86 | 49.96 | 84.65 | 5.86 | 9.50 | 0.40 | 5.85 | 93.75 |
| 8 | 87.8 | 3.1 | 1.00 | 1.9 | 40.5 | 0.7 | 48.45 | 1.54 | 50.01 | 92.21 | 1.76 | 6.04 | 0.75 | 1.30 | 97.95 |
| 9 | 95.6 | 7.6 | 0.50 | 2.8 | 66.5 | 4.6 | 30.83 | 2.52 | 66.66 | 88.76 | 2.55 | 8.69 | 2.12 | 2.50 | 95.38 |
| 10 | 95.6 | 11.7 | 0.75 | 4.7 | 64.1 | 3.2 | 37.84 | 5.01 | 57.15 | 84.75 | 4.16 | 11.09 | 2.14 | 5.66 | 92.20 |
| 11 | 95.6 | 7.6 | 1.00 | 3.7 | 54.5 | 2.5 | 46.23 | 3.78 | 50.00 | 87.38 | 3.33 | 9.29 | 2.41 | 4.25 | 93.34 |
| 12 | 95.6 | 3.1 | 0.75 | 1.4 | 57.5 | 2.7 | 41.51 | 1.32 | 57.17 | 90.69 | 1.26 | 8.05 | 2.00 | 1.37 | 96.63 |
| 13 | 87.8 | 7.6 | 0.75 | 4.0 | 49.7 | 1.4 | 39.62 | 3.24 | 57.15 | 88.80 | 3.70 | 7.50 | 1.01 | 2.87 | 96.12 |
| 14 | 87.8 | 7.6 | 0.75 | 3.9 | 50.8 | 1.3 | 39.65 | 3.24 | 57.11 | 88.78 | 3.61 | 7.61 | 0.92 | 2.94 | 96.14 |
| 15 | 87.8 | 7.6 | 0.75 | 3.9 | 51.0 | 1.3 | 39.62 | 3.24 | 57.14 | 88.85 | 3.61 | 7.55 | 0.94 | 2.94 | 96.12 |
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