Chemometric Study on Alkaline Pre-treatments of Wood Chips Prior to Pulping

BioResources

Jarmo Louhelainen¹  Petteri Malkavaara¹  Michał Drożdżek¹  Joni Tapani Lehto²  Hannu Pakkanen²  Teresa Kłosińska²  Raimo Alén³ 

[1] Finland;University of Jyväskylä;University of Tampere;

关键词: Alkaline pre-treatment;    Biorefining;    Chemical pulp;    Chemometrics;    Lignin;    Molar mass distribution;    Principal component analysis;    Scots pine;    Silver/white birch;   

DOI  :  10.15376/biores.11.2.4621-4632

来源: DOAJ

【 摘 要 】

Alkaline pre-treatments were performed for the production of organics-containing effluents from silver/white birch (Betula pendula/pubescens) and Scots pine (Pinus sylvestris) chips prior to chemical pulping. Pre-treatment conditions were varied with respect to time (from 30 min to 120 min), temperature (130 °C and 150 °C), and alkali charge (1, 2, 3, 4, 6, and 8% of NaOH on oven-dried wood). The analytical data (total content, weight average molar mass, and molar mass distribution) on dissolved lignin were subjected to principal component analysis to examine the relationship between molar mass and molar mass distributions in lignin removed from different wood species under varying alkaline pre-treatment conditions. Using this method, differences between the wood species and effects of the various pre-treatment process variables (i.e., time, temperature, and alkali charge) were determined.

【 授权许可】

Unknown