Research Article
Consecutively Preparing D-Xylose, Organosolv Lignin, and Amorphous Ultrafine Silica from Rice Husk
Table 2
Factors and levels for L9(3)4 orthogonal test.
| Variable | Levels | 1 | 2 | 3 |
| Ethanediol’s concentration (v/v) | 70 | 80 | 90 | Ratio of residue to ethanediol (g : mL) | 1 : 4 | 1 : 6 | 1 : 8 | Time (hour) | 4 | 5 | 6 | Temperature (K) | 473 | 483 | 493 |
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