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Table 2 Mass balance of pretreatment of non-torrefied and torrefied wood of aspen and spruce

From: Comparison of [HSO4], [Cl] and [MeCO2] as anions in pretreatment of aspen and spruce with imidazolium-based ionic liquids

Sample Dry mass (mg)
RSMa Arabinan Galactan Glucan Xylan Mannan Ligninb
Aspen (control) 50.0 ± 0.1 0.16 ± 0.00 0.70 ± 0.01 22.63 ± 0.08 7.96 ± 0.03 1.32 ± 0.01 9.79 ± 0.03
[HSO4] Aspen solid 32.6 ± 0.4 NDc ND 20.44 ± 0.22 3.00 ± 0.04 1.11 ± 0.01 5.36 ± 0.23
liquid   0.07 ± 0.01 0.37 ± 0.01 0.34 ± 0.01 3.09 ± 0.06 0.15 ± 0.01  
[Cl] Aspen solid 43.6 ± 0.1 ND 0.50 ± 0.01 20.67 ± 0.09 7.22 ± 0.05 0.98 ± 0.01 9.34 ± 0.12
liquid   0.04 ± 0.01 0.17 ± 0.02 0.59 ± 0.02 0.04 ± 0.01 0.31 ± 0.02  
[MeCO2] Aspen solid 38.3 ± 0.1 ND 0.34 ± 0.01 20.40 ± 0.30 5.36 ± 0.07 0.88 ± 0.01 9.05 ± 0.24
liquid   0.06 ± 0.01 0.27 ± 0.02 0.22 ± 0.00 1.58 ± 0.38 0.14 ± 0.02  
T-aspen (control) 50.0 ± 0.1 ND ND 15.97 ± 0.03 1.32 ± 0.01 0.69 ± 0.01 27.32 ± 0.05
[HSO4] T-aspen solid 44.4 ± 0.6 ND ND 14.02 ± 0.33 0.63 ± 0.02 ND 26.27 ± 0.35
liquid   ND ND 1.12 ± 0.04 0.45 ± 0.02 0.09 ± 0.01  
[Cl] T-aspen solid 49.3 ± 0.1 ND ND 14.30 ± 0.11 1.11 ± 0.01 ND 27.34 ± 0.28
liquid   ND ND 0.32 ± 0.02 0.09 ± 0.01 0.03 ± 0.01  
[MeCO2] T-aspen solid 47.4 ± 0.6 ND ND 14.47 ± 0.39 0.99 ± 0.02 ND 26.93 ± 0.49
liquid   ND ND 0.61 ± 0.04 0.22 ± 0.02 0.05 ± 0.01  
Spruce (control) 50.0 ± 0.1 0.52 ± 0.01 0.98 ± 0.01 21.85 ± 0.06 3.02 ± 0.01 5.71 ± 0.02 16.27 ± 0.05
[HSO4] Spruce solid 38.7 ± 0.4 ND 0.28 ± 0.01 20.34 ± 0.18 1.45 ± 0.01 3.27 ± 0.03 12.73 ± 0.24
liquid   0.36 ± 0.05 0.51 ± 0.05 0.41 ± 0.04 0.95 ± 0.09 1.51 ± 0.15  
[Cl] Spruce solid 45.6 ± 1.1 0.47 ± 0.02 0.92 ± 0.03 19.93 ± 0.41 2.89 ± 0.07 5.07 ± 0.13 15.21 ± 0.36
liquid   0.03 ± 0.01 0.05 ± 0.01 0.08 ± 0.01 0.01 ± 0.01 0.29 ± 0.03  
[MeCO2] Spruce solid 42.6 ± 0.4 0.37 ± 0.02 0.76 ± 0.01 20.57 ± 0.21 2.09 ± 0.03 4.88 ± 0.04 13.21 ± 0.33
liquid   0.11 ± 0.01 0.10 ± 0.01 0.06 ± 0.00 0.70 ± 0.11 0.11 ± 0.01  
T-spruce (control) 50.0 ± 0.1 ND 0.29 ± 0.01 19.95 ± 0.09 0.79 ± 0.01 1.90 ± 0.01 26.81 ± 0.12
[HSO4] T-spruce solid 43.9 ± 0.1 ND ND 18.96 ± 0.04 0.40 ± 0.01 0.89 ± 0.01 23.27 ± 0.67
liquid   ND 0.15 ± 0.01 0.90 ± 0.06 0.30 ± 0.01 0.86 ± 0.06  
[Cl] T-spruce solid 48.8 ± 0.8 ND 0.27 ± 0.01 19.45 ± 0.46 0.74 ± 0.02 1.55 ± 0.05 24.11 ± 1.04
liquid   ND 0.02 ± 0.01 0.47 ± 0.03 0.04 ± 0.01 0.31 ± 0.01  
[MeCO2] T-spruce solid 47.5 ± 0.2 ND 0.22 ± 0.01 18.47 ± 0.11 0.58 ± 0.01 1.28 ± 0.03 22.52 ± 0.28
liquid   ND 0.03 ± 0.01 0.36 ± 0.02 0.07 ± 0.01 0.21 ± 0.01  
  1. a RSM recovered solid mass
  2. b Lignin sum of ASL and Klason lignin
  3. c ND not detectable
  4. Data based on quadruplicate measurements