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Table 1 Composition of pretreated solids at different pretreatment conditions

From: A novel hybrid organosolv: steam explosion method for the efficient fractionation and pretreatment of birch biomass

Pretreatment conditions Biomass solubilization (% of initial biomass) Cellulose (% w/w) Hemicellulose (% w/w) Lignin (% w/w)
Ethanol effect 30 min 50% v/v 47.9 65.9 (1.2%) 15.1 (74.8%) 6.7 (81.2%)
60% v/v 48.9 67.1 (1.3%) 21.0 (65.7%) 7.1 (80.5%)
70% v/v 41.5 61.7 (0.0%) 21.9 (59.0%) 8.7 (72.6%)
Time effect 60% v/v 15 min 44.7 66.3 (0.0%) 22.0 (61.1%) 7.8 (77.0%)
30 min 48.9 67.1 (1.3%) 21.0 (65.7%) 7.1 (80.5%)
60 min 40.0 60.7 (0.0%) 19.1 (63.4%) 13.2 (57.5%)
Catalyst effect 15 min—60% v/v ethanol 0% 44.7 66.3 (0.0%) 22.0 (61.1%) 7.8 (77.0%)
0.2% 45.0 61.1 (3.2%) 25.8 (54.5%) 7.4 (78.2%)
1% 63.1 77.9 (17.2%) 8.9 (89.5%) 7.0 (86.2%)
  1. All results are expressed based on dry mass. Numbers in parenthesis represent the mass fraction of each component (i.e., cellulose, hemicellulose, and lignin) that was solubilized at the end of the pretreatment (calculated using Eq. 1). Compositional analysis was performed in duplicates, and the standard error was > 5% of the value. All the trials were done with the explosive discharge step at the end of the treatment