Table 2 Pretreatment liquor composition of the first stage pretreatment and of the second stage with different 2-naphthol dosages
From: Two-stage steam explosion pretreatment of softwood with 2-naphthol as carbocation scavenger
1st-stage | 2nd-stage: 2-naphthol in mol/mol | ||||
|---|---|---|---|---|---|
0 (ctrl) | 0.051 | 0.103 | 0.205 | ||
pH | 3.35 | 3.34 | 3.18 | 3.26 | |
Volume (ml) | 2532 | 655 | 787.5 | 789.6 | 790 |
Monomeric (g/l) | |||||
Glucose | 0.38 | 3.04 | 2.45 | 2.70 | 2.50 |
Mannose | 1.55 | 3.69 | 3.52 | 3.05 | 3.17 |
Total (g/l) | |||||
Glucose | 3.35 | 4.07 | 3.50 | 3.62 | 3.52 |
Mannose | 14.47 | 3.30 | 3.45 | 2.65 | 2.91 |
Acetic acid | 0.68 | 2.01 | 1.68 | 1.83 | 1.74 |
HMF | 0.16 | 3.26 | 2.74 | 3.12 | 2.89 |
Furfural | 0.24 | 0.45 | 0.33 | 0.28 | 0.28 |
2-Naphthol | 0 | 0 | 0 | 0.044 | 0.062 |
Monomeric (g/kg raw biomass) | |||||
Glucose | 2.61 | 5.40 | 5.24 | 5.78 | 5.36 |
Mannose | 10.67 | 6.55 | 7.52 | 6.53 | 6.80 |
Total (g/kg raw biomass) | |||||
Glucose | 22.98 | 7.23 | 7.49 | 7.76 | 7.54 |
Mannose | 99.42 | 5.87 | 7.37 | 5.69 | 6.24 |
Acetic acid | 4.64 | 3.58 | 3.60 | 3.92 | 3.72 |
HMF | 1.10 | 5.8 | 5.85 | 6.70 | 6.20 |
Furfural | 1.62 | 0.62 | 0.71 | 0.60 | 0.59 |
2-Naphthol | 0 | 0 | 0 | 0.10 | 0.13 |