Table 1. Pulp Characterization and pH of the Spent Liquor of the E. globulus Wood Chips Fractionation Experiments in 50 wt % GVL Solution at 180 °C, for 150 min with Varying L:W Ratios in the Air-Bath Digester.
| Solid Fraction (Pulp) |
|||||||
|---|---|---|---|---|---|---|---|
| L:W ratio (L/kg) | yielda (% odw) | celluloseb (% odp) | C5c (% odp) | C6d (% odp) | lignin (% odp) | viscosity (mL/g) | spent liquor pH |
| 10 | 48.8 | 90.8 | 5.1 | 1.2 | 2.9 | 640 | 3.68 |
| 8 | 48.4 | 91.2 | 5.0 | 1.3 | 2.5 | 597 | 3.66 |
| 6 | 47.2 | 91.3 | 5.0 | 1.2 | 2.5 | 556 | 3.53 |
| 4 | 47.2 | 91.8 | 4.6 | 1.1 | 2.5 | 531 | 3.45 |
| 3 | 46.3 | 91.4 | 4.4 | 1.0 | 3.2 | 517 | 3.06 |
| 2 | 45.5 | 92.0 | 4.0 | 0.8 | 3.2 | 390 | 2.99 |
a
Percent on oven-dried wood.
b
Percent on oven-dried pulp.
c
C5 hemicelluloses (xylan and arabinan).
d
C6 hemicelluloses (galactan, mannan, and rhamnan).