Color evolution of poplar wood chips and its response to lignin and extractives changes in autohydrolysis pretreatment

Xiaodi Wang, Qingxi Hou, Xin Zhang, Yongchao Zhang, Wei Liu, Chunlin Xu, Fangdong Zhang

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Combining chemi-mechanical pulping with autohydrolysis pretreatment is an efficient and value-added utilization approach for lignocellulosic biomass in paper industry. To further promote the utilization of autohydrolyzed biomass in chemi-mechanical pulping, the color evolution of poplar wood chips in autohydrolysis pretreatment and its chromogenic mechanism were investigated by using CIELab color system, FT-IR, NMR and GPC. The results showed that the total color difference ΔE* increased obviously, which were remarkable as the combined hydrolysis factor (CHF) increased. The lignin content led to a more significant influence on the color of poplar wood chips than the extractives. The autohydrolysis pretreatment with a higher CHF accelerated the degradation and subsequent condensation of lignin, resulting in the formation of chromophoric groups, such as Hibbert ketone, quinones and quinone methides. It is of great significance for biomass refinery and paper industry to reveal the color evolution of poplar wood chips caused by autohydrolysis pretreatment from the point of view of chemical components' structure.

Original languageEnglish
Pages (from-to)673-679
JournalInternational Journal of Biological Macromolecules
Volume157
DOIs
Publication statusPublished - 15 Aug 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Chromogenic mechanism
  • Color evolution

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