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Table 2 Effects of deacetylation and pretreatment residence times on acetate release from solubilized xylooligomers

From: The impacts of deacetylation prior to dilute acid pretreatment on the bioethanol process

a Kramer 34M95 Pretreatment residence times (min) Free acetate/xylose monomer (mol/mol) Free acetate/total solubilized xylose monomer (mol/mol)* Bound acetate/xylose oligomer Total acetate/total solubilized xylan** (mol/mol)
  Control 5 0.20 0.20 0.46 0.36
   10 0.21 0.21 0.57 0.36
   20 0.27 0.26 0.72 0.38
  Deacetylated 5 0.04 0.04 0.27 0.10
   10 0.07 0.07 0.33 0.11
   20 0.10 0.09 0.34 0.12
b Kramer 33B51 Pretreatment residence times (min) Free acetate/xylose monomer (mol/mol) Free acetate/total solubilized xylose monomer (mol/mol)* Bound acetate/xylose oligomer Total acetate/total solubilized xylan** (mol/mol)
  Control 5 0.17 0.17 0.45 0.34
   10 0.19 0.19 0.55 0.35
   20 0.25 0.25 0.69 0.39
  Deacetylated 5 0.05 0.04 0.30 0.11
   10 0.08 0.07 0.34 0.11
   20 0.11 0.10 0.40 0.14
  1. *total solubilized xylose monomer consists of solubilized xylose in monomer form and in degraded form (furfural)
  2. **total solubilized xylan consists of xylose monomer, xylose oligomer and furfural