Novel Green Liquor Pretreatment of Loblolly Pine Chips to Facilitate Enzymatic Hydrolysis into Fermentable Sugars for Ethanol Production

Softwood species generally have been found very recalcitrant to enzymatic hydrolysis of the carbohydrate fractions to monomeric sugars. To solve this problem, loblolly pine chips were pretreated with green liquor at 12-20% Total Titratable Alkali (TTA) (as Na 2 O on wood) at 170°C for 800 H-factor....

Full description

Saved in:
Bibliographic Details
Published in:Journal of wood chemistry and technology 2010-07, Vol.30 (3), p.205-218
Main Authors: Wu, Shu-fang, Chang, Hou-min, Jameel, Hasan, Philips, Richard
Format: Article
Language:English
Subjects:
Biofuel
Chemical reactions
Conversion
Enzymes
Ethanol
Ethyl alcohol
Fermentation
green liquor
Hardwoods
Hydrolysis
loblolly pine
Pine
pretreatment
Refining
Sugar
Sugars
Wood
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Softwood species generally have been found very recalcitrant to enzymatic hydrolysis of the carbohydrate fractions to monomeric sugars. To solve this problem, loblolly pine chips were pretreated with green liquor at 12-20% Total Titratable Alkali (TTA) (as Na 2 O on wood) at 170°C for 800 H-factor. The yield of resulting pulp was 76.5-78.6% and the lignin content decreased from 29.2 to 20.2-22.4% and the total polysaccharide decreased from 62.6 to 53.8-55.0%, all based on the weight of original wood. When the pulp was subjected to enzymatic hydrolysis using 40 Filter Paper Unit (FPU)/g pulp, only 41% of the polysaccharides in wood were converted to monomeric sugars. This conversion figure is much lower than that of mixed southern hardwoods (80%) treated under similar conditions. If the green liquor treated pulp was further subjected to either oxygen delignification or mechanical refining prior to the enzymatic hydrolysis, the conversion rate increased to around 55% and 60%, respectively. Furthermore, combination of oxygen delignification and refining further increased the total sugar conversion to 78% of the total sugar in wood, approximately equal to that of the mixed southern hardwoods.
ISSN:0277-3813
1532-2319
DOI:10.1080/02773811003746717