Table 5.
Retention times, relative abundances, assignment to guaiacyl-type (G) or syringyl-type (S) aromatic lignin subunits of pyrolysis products and respective S/G ratios of the Organosolv lignin (OL) used and one of the produced PU sample (PU-3:1).
| # | Pyrolysis Product | RT (min) |
PU-3:1 (%) |
OL (%) |
|---|---|---|---|---|
| 1 | Guaiacol | 16.07 | 1.3 | 6.7 |
| 2 | 5-Methylguaiacol | 19.48 | 0.4 | 0.5 |
| 3 | Creosol | 20.01 | 0.7 | 4.6 |
| 4 | 5-Methoxyresinol | 22.53 | - | 2.8 |
| PU-D1 | Trimethylolpropane | 23.13 | 15.0 | - |
| 5 | 4-Ethylguaiacol | 23.15 | - | 1.0 |
| 6 | 4-Vinylguaiacol | 24.39 | 0.7 | 2.6 |
| PU-D2 | 2.6-Diisocyanate toluene | 25.65 | 9.1 | - |
| 7 | Syringol | 25.75 | - | 15.1 |
| PU-D3 | 2,4-Diisocyanate toluene | 25.95 | 63.3 | - |
| 8 | Dihydroeugenol | 26.25 | - | 0.4 |
| 9 | Methylsyringol | 26.60 | 0.2 | 1.1 |
| 10 | Vanillin | 27.31 | 0.1 | 1.6 |
| 11 | Isoeugenol, cis | 27.63 | - | 1.4 |
| 12 | Vanillic acid | 28.94 | 1.1 | 8.5 |
| 13 | Isoeugenol, trans | 29.01 | 0.4 | 1.6 |
| 14 | Lauryl chloride | 29.63 | - | 3.4 |
| 15 | 1-Dodecanol | 29.75 | - | 1.6 |
| 16 | Acetoguaiacone | 30.18 | - | 0.9 |
| 17 | Guaiacylacetone | 31.59 | 0.1 | 0.9 |
| 18 | 3,5-Dimethoxyacetophenone | 32.67 | 0.6 | 3.9 |
| 19 | Methoxyeugenol | 33.80 | 0.1 | 0.7 |
| PU-D4 | 4-Penten-2-ol | 35.08 | 2.7 | - |
| 20 | Syringaldehyde | 35.52 | - | 3.7 |
| 21 | Myristyl chloride | 35.89 | - | 2.7 |
| 22 | Ferulic acid | 36.68 | 0.4 | 2.8 |
| 23 | Acetosyringone | 37.61 | 0.1 | 2.6 |
| 24 | Myristyl alcohol | 37.73 | - | 2.7 |
| 25 | Stearic acid | 38.29 | 0.1 | 0.4 |
| 26 | Homosyringic acid | 38.67 | 0.3 | 3.2 |
| S/G ratio | - | 1.0 |