Table 3. Yields of Other Products under Different Reaction Conditions.
| alkali concentration (mol/L) | time (h) | O2 (MPa) | temperature (°C) | p-hydroxybenzaldehyde yield (%) | vanillin yield (%) | syringic acid (%) |
|---|---|---|---|---|---|---|
| 0.5 | 2.5 | 0.8 | 160 | 1.23 ± 0.22 | 5.33 ± 0.56 | 0.44 ± 0.07 |
| 1.0 | 2.5 | 0.8 | 160 | 1.35 ± 0.15 | 6.16 ± 0.47 | 0.42 ± 0.07 |
| 1.5 | 2.5 | 0.8 | 160 | 1.32 ± 0.12 | 6.32 ± 0.64 | 0.33 ± 0.08 |
| 2.0 | 2.5 | 0.8 | 160 | 1.29 ± 0.21 | 6.34 ± 0.52 | 0.30 ± 0.02 |
| 2.5 | 2.5 | 0.8 | 160 | 1.27 ± 0.11 | 5.12 ± 0.44 | 0.27 ± 0.03 |
| 3.0 | 2.5 | 0.8 | 160 | 1.23 ± 0.34 | 4.39 ± 0.52 | 0.22 ± 0.07 |
| 1.0 | 0.5 | 0.8 | 160 | 0.52 ± 0.14 | 4.34 ± 0.44 | 0.24 ± 0.08 |
| 1.0 | 1.0 | 0.8 | 160 | 0.94 ± 0.52 | 4.27 ± 0.23 | 0.25 ± 0.02 |
| 1.0 | 1.5 | 0.8 | 160 | 1.17 ± 0.11 | 4.35 ± 0.52 | 0.34 ± 0.03 |
| 1.0 | 2.0 | 0.8 | 160 | 1.33 ± 0.13 | 6.44 ± 0.61 | 0.37 ± 0.01 |
| 1.0 | 2.5 | 0.8 | 160 | 1.37 ± 0.53 | 6.21 ± 0.59 | 0.41 ± 0.03 |
| 1.0 | 3.0 | 0.8 | 160 | 1.37 ± 0.14 | 6.33 ± 0.47 | 0.47 ± 0.04 |
| 1.0 | 2.5 | 0.2 | 160 | 0.94 ± 0.21 | 4.37 ± 0.36 | 0.22 ± 0.08 |
| 1.0 | 2.5 | 0.4 | 160 | 1.24 ± 0.17 | 5.11 ± 0.58 | 0.21 ± 0.07 |
| 1.0 | 2.5 | 0.6 | 160 | 1.32 ± 0.21 | 5.36 ± 0.46 | 0.37 ± 0.06 |
| 1.0 | 2.5 | 0.8 | 160 | 1.34 ± 0.30 | 6.18 ± 0.44 | 0.41 ± 0.07 |
| 1.0 | 2.5 | 1.0 | 160 | 1.30 ± 0.22 | 5.22 ± 0.85 | 0.52 ± 0.04 |
| 1.0 | 2.5 | 1.2 | 160 | 1.28 ± 0.11 | 4.14 ± 0.75 | 0.55 ± 0.03 |
| 1.0 | 2.5 | 0.8 | 100 | 1.12 ± 0.12 | 4.16 ± 0.49 | 0.51 ± 0.05 |
| 1.0 | 2.5 | 0.8 | 120 | 1.27 ± 0.15 | 5.43 ± 0.85 | 0.47 ± 0.04 |
| 1.0 | 2.5 | 0.8 | 140 | 1.31 ± 0.19 | 5.77 ± 0.72 | 0.45 ± 0.08 |
| 1.0 | 2.5 | 0.8 | 160 | 1.36 ± 0.14 | 6.15 ± 0.74 | 0.44 ± 0.04 |
| 1.0 | 2.5 | 0.8 | 180 | 1.41 ± 0.14 | 6.09 ± 0.22 | 0.46 ± 0.03 |