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Title
Impact of hemicelluloses pre-extraction on pulp properties of sugarcane bagasse
Authors
P. F. VENA M. P. GARCIA-APARICIO M. BRIENZO J. F. GORGENS and T. RYPSTRA
Received
August 24, 2012
Published
Volume 47 Issue 5-6 May-June
Keywords
biorefinery, xylan extraction, sugarcane bagasse, chemical pulping, pulp quality, handsheet strengths
Abstract
The extraction of hemicelluloses, which otherwise would be wasted in the black liquor, can be integrated with chemical
pulping processes in a biorefinery approach that will generate a sugar-rich feedstock for production of fuels and
chemicals. Extractions of hemicelluloses from sugarcane bagasse under dilute sulphuric acid or mild alkaline
conditions were performed, using a central composite experimental design. Selected solid residues obtained after dilute
acid, hot water (zero acid) or mild alkaline pre-extractions were subjected to soda or soda-AQ pulping, and kraft
pulping of the dilute acid pre-extracted solid residue was also performed. The integration of hemicelluloses preextraction by alkaline methods into a soda-AQ-based pulping process was preferred for sugarcane bagasse as feedstock,
since it enabled xylan recovery of 69.1%, while providing pulps with superior tear strength and brightness.
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