Comparison of pulp species in IONCELL-P: selective hemicellulose extraction method with ionic liquids
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Annariikka Roselli
Abstract
In our recent studies, it was demonstrated that the IONCELL-P process selectively dissolves hemicelluloses from bleached birch kraft pulp in a mixture of 1-ethyl-3-methylimidazolium acetate ([emim][OAc]) and water as a solvent system. The IONCELL-P method refines paper-grade pulp to dissolving pulp with <5% hemicelluloses and allows isolation of polymeric xylan without yield losses or polymer degradation. This paper is a comparative study where paper-grade pine, birch, and eucalyptus pulps are subjected to the IONCELL-P process with two [emim]-based ionic liquids (ILs), i.e. [emim]acetate and [emim]dimethylphosphate. Also, the effect of an endoglucanase pretreatment was investigated to check whether 1) the pulp viscosity could be adjusted for the following process steps before the hemicellulose extraction and 2) the decreasing pulp viscosity would open the fiber structure and thus enhance the extraction. Under optimum conditions, the birch xylan content could be reduced from 25.4% down to 1.3% and for eucalyptus from 16.6% to 2.4%. Pine pulp xylan and glucomannan were decreased from 8.1% and 7.1% to 0.9% and 2.2%, respectively. The residual hemicellulose contents of the pine pulp could be further decreased with a hemicellulase pretreatment. The selectivity of the dissolution towards hemicelluloses was better for hardwoods. Adjusting the pulp viscosity by endoglucanase prior to the IONCELL-P process reduced the selectivity as short-chain cellulose molecules were extracted along with the hemicelluloses.
Acknowledgments
This research was conducted as part of the Future Biorefinery programs (FuBio) coordinated by the Finnish Bioeconomy Cluster (FIBIC), and as a separate project funded by Metsä Fibre Oy. The funding from companies linked to the FuBio programs and the Finnish Funding Agency for Technology and Innovation (TEKES) enabled long-time research.
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©2016 by De Gruyter
Articles in the same Issue
- Frontmatter
- Original Articles
- Ferulates and lignin structural composition in cork
- Comparison of pulp species in IONCELL-P: selective hemicellulose extraction method with ionic liquids
- A novel and highly efficient polymerization of sulfomethylated alkaline lignins via alkyl chain cross-linking method
- Curing of wood treated with vinyl acetate-epoxidized linseed oil copolymer (VAc-ELO)
- Screening of juvenile Pinus radiata wood by means of Py-GC/MS for compression wood focussing on the ratios of p-hydroxyphenyl to guaiacyl units (H/G ratios)
- Characterization of adhesive penetration in wood bond by means of scanning thermal microscopy (SThM)
- Critical moisture conditions for fungal decay of modified wood by basidiomycetes as detected by pile tests
- Synthesis of fire retardants based on N and P and poly(sodium silicate-aluminum dihydrogen phosphate) (PSADP) and testing the flame-retardant properties of PSADP impregnated poplar wood
- Monitoring electrical properties of thermally modified wood as a possible tool for quality assessment
- Formation and properties of polyelectrolytes/TiO2 composite coating on wood surfaces through layer-by-layer assembly method
- The effect of temperature and moisture content on the fracture behaviour of spruce and birch
- A three-dimensional void reconstruction method for analyzing fractal dimensions of void volume in wood-strand composites
- Erratum
- Erratum to: Standard and non-standard deformation behaviour of European beech and Norway spruce during compression
Articles in the same Issue
- Frontmatter
- Original Articles
- Ferulates and lignin structural composition in cork
- Comparison of pulp species in IONCELL-P: selective hemicellulose extraction method with ionic liquids
- A novel and highly efficient polymerization of sulfomethylated alkaline lignins via alkyl chain cross-linking method
- Curing of wood treated with vinyl acetate-epoxidized linseed oil copolymer (VAc-ELO)
- Screening of juvenile Pinus radiata wood by means of Py-GC/MS for compression wood focussing on the ratios of p-hydroxyphenyl to guaiacyl units (H/G ratios)
- Characterization of adhesive penetration in wood bond by means of scanning thermal microscopy (SThM)
- Critical moisture conditions for fungal decay of modified wood by basidiomycetes as detected by pile tests
- Synthesis of fire retardants based on N and P and poly(sodium silicate-aluminum dihydrogen phosphate) (PSADP) and testing the flame-retardant properties of PSADP impregnated poplar wood
- Monitoring electrical properties of thermally modified wood as a possible tool for quality assessment
- Formation and properties of polyelectrolytes/TiO2 composite coating on wood surfaces through layer-by-layer assembly method
- The effect of temperature and moisture content on the fracture behaviour of spruce and birch
- A three-dimensional void reconstruction method for analyzing fractal dimensions of void volume in wood-strand composites
- Erratum
- Erratum to: Standard and non-standard deformation behaviour of European beech and Norway spruce during compression