• Home
  • Search Results
  • Understanding of pH value and its effect on autohydrolysis pretreatment prior to poplar chemi-thermomechanical pulping.

Understanding of pH value and its effect on autohydrolysis pretreatment prior to poplar chemi-thermomechanical pulping.

Bioresource technology (2015-08-28)
Lihui Liu, Wei Liu, Qingxi Hou, Junwei Chen, Ningpan Xu
ABSTRACT

Autohydrolysis pretreatment with different severity factors was performed on poplar chips prior to chemi-thermomechanical pulping (CTMP) in order to investigate the change in pH value and its effect on the autohydrolysis pretreatment. The results showed that the dissolution amount of acetic acid increased with raising the severity factor of the pretreatment and declining the size of poplar chips, respectively. Besides, a logarithmic relationship between the amount of acetic acid released in the autohydrolysis liquor (AHL) and pH value of the AHL was observed. The amounts of glucose and xylose (including those in the form of monomers, oligomers, and polysaccharides) as well as furfural and hydroxymethylfurfural (HMF) also depended on the pH value of the AHL to some extent.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Acetic acid-12C2, 99.9 atom % 12C
Sigma-Aldrich
Sulfuric acid, 99.999%
Sigma-Aldrich
Acetic acid, natural, ≥99.5%, FG
Sigma-Aldrich
Acetic acid, ≥99.5%, FCC, FG
Sigma-Aldrich
Acetic acid, for luminescence, BioUltra, ≥99.5% (GC)
SAFC
Acetic acid, glacial
Sigma-Aldrich
D-(+)-Xylose, ≥99%
Sigma-Aldrich
D-(+)-Xylose, BioXtra, ≥99%
Sigma-Aldrich
5α-Androstan-17β-ol-3-one, ≥97.5%
Sigma-Aldrich
D-(+)-Xylose, ≥99%
Sigma-Aldrich
D-(+)-Xylose, BioUltra, ≥99.0% (sum of enantiomers, HPLC)