Table 4.
Resulting acid index, esterification yield, and percentages of organic (OP) and aqueous (AP) phases obtained after esterification.
| Biochar | Impregnation | Acid Index | Esterification Yield |
OP (%) |
AP (%) |
|---|---|---|---|---|---|
| 1 | No | 172.2 | 5.5 | - | - |
| 2 | No | 180.7 | 0.3 | - | - |
| 4 | Yes | 13.1 | 92.8 | 63.9 | 32.1 |
| 5 | Yes | 16.1 | 91.2 | 64.1 | 22.8 |
| 6 | No | 183.7 | 0.0 | - | - |
| 6 | Yes | 26.7 | 85.3 | 52.1 | 26.9 |
| 7 | Yes | 17.4 | 90.4 | 60.8 | 36.8 |
| 8 | Yes | 12.9 | 92.9 | 58.5 | 26.5 |
| 9 | Yes | 8.8 | 95.2 | 61.0 | 28.5 |
| 10 | Yes | 9.8 | 94.6 | 62.8 | 23.7 |
| 11 | Yes | 7.1 | 96.1 | 55.3 | 25.3 |
| 12 | Yes | 7.0 | 96.2 | 63.7 | 26.6 |
| 13 | Yes | 10.3 | 94.3 | 57.7 | 23.0 |
| 15 | Yes | 8.7 | 95.2 | 49.2 | 28.9 |
| 16 | Yes | 8.4 | 95.4 | 67.3 | 24.8 |
| 17 | Yes | 7.8 | 95.7 | 59.9 | 25.7 |