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Table 1 Pretreatment conditions and yields.

From: Laboratory-scale method for enzymatic saccharification of lignocellulosic biomass at high-solids loadings

Sample 1 2 3 4 5
Reactor VR SE SE HR HR
Acid concentration* 48 7.25 7.25 4.5 2.5
pH 1.3 1.6 to 2.7† 1.6 to 2.2† 2.2 2.3
Reactor Temperature 190°C 170°C 150°C 150°C 150°C
Residence time 1 min 30 min 30 min 3 to 5 min‡ 2 to 4 min‡
Combined Severity§ 1.3 0.8 to 1.9 0.8 to 1.3 -0.2 to 0 -0.5 to -0.2
Xylan removed 88.9% 88.9% 86.7% 83.1% 19.6%
Monomeric xylan Yield 72.1% 69.6% 61.3% 53.4% 2.1%
Total xylan yield 81.4% 79.2% 83.4% 79.9% 19.1%
Furfural yield 9.7% 9.7% 3.3% 3.3% 0.5%
Cellulose content 59.1% 62.9% 59.1% 57.0% 42.2%
  1. *Concentration in mg Acid/g dry biomass.
  2. † Addition of steam throughout reaction dilutes the sample and changes the pH.
  3. ‡Residence time distribution (± 2 standard deviations).
  4. §Calculated as reported by van Walsum [21]