Kinetics and mechanism of hemicelluloses removal from cellulosic fibers during the cold caustic extraction process

•Kinetics and mechanism of hemicelluloses removal from CCE were determined.•The process included bulk removal, transition and residual removal phase.•Hemicelluloses MW and fiber wall tortuosity controlled hemicelluloses removal.•Hemicelluloses with low MW and at outer region, were preferentially rem...

Full description

Saved in:
Bibliographic Details
Published inBioresource technology Vol. 234; pp. 61 - 66
Main Authors Li, Jianguo, Hu, Huichao, Li, Hailong, Huang, Liulian, Chen, Lihui, Ni, Yonghao
Format Journal Article
LanguageEnglish
Published England Elsevier Ltd 01.06.2017
Subjects
Caustics
Cellulose - chemistry
Cold caustic extraction
Diffusion
Hemicellulose removal
Hemicelluloses distribution
Kinetics
Kinetics and mechanism
Molecular Weight
Polysaccharides
Kinetics and mechanism
Hemicellulose removal
Hemicelluloses distribution
Cold caustic extraction
Molecular weight
Online AccessGet full text

Cover

More Information
Summary:•Kinetics and mechanism of hemicelluloses removal from CCE were determined.•The process included bulk removal, transition and residual removal phase.•Hemicelluloses MW and fiber wall tortuosity controlled hemicelluloses removal.•Hemicelluloses with low MW and at outer region, were preferentially removed. The effective separation of hemicelluloses and cellulose is desirable for the production of high-purity cellulose, which is a sustainable raw material for many value-added applications. For this purpose, the kinetics and mechanism of hemicelluloses removal from the cold caustic extraction (CCE) were investigated in the present study. The hemicelluloses removal process consists of: 1) the bulk phase, characteristic of significant hemicelluloses removal; 2) the transition phase, hemicelluloses transferring from the inner to the outer region of the fiber wall, with negligible overall hemicelluloses removal; 3) the residual phase, presenting a weak but continuing hemicelluloses removal. Furthermore, the enzymatic peeling method was adopted to study the fundamentals of hemicelluloses removal. The results showed that the molecular weight of hemicelluloses is the main parameter governing their diffusion/dissolution processes, and that the low molecular weight hemicelluloses are preferentially removed.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2017.03.026