Profiles of alkali concentration and galactoglucomannan degradation in kraft impregnation of Scots pine wood: Experimental observations and modeling
-
Pablo N. Montagna
,
Herbert Sixta
Abstract
A deep understanding of alkali impregnation including the profiles of alkali concentration and hemicellulose degradation is necessary to analyze the optimization of current and innovative processes. In this paper, the impregnation of Scots pine (Pinus sylvestris L.) wood is analyzed and modeled under consideration of deacetylation, reactions of acidic group, and galactoglucomannan (GGM) degradation. The immobile anionic groups activated by the ionization of lignin-derived OH groups are also considered for the assessment of the Donnan effect. Predicted profiles of sodium and hydroxide ions and acetyl group concentrations are compared to experimental results. The balance between impregnation and hemicellulose degradation levels is discussed based on the developed models. Expectedly, higher concentrations and temperatures speed up the impregnation process. Nevertheless, a higher OH-concentration has two benefits for the same impregnation front position – the alkali charge inside the chip is higher and the GGM degradation is lower.
Acknowledgments
The authors wish to thank Universidad Nacional del Litoral (UNL) (Projects: CAID+D 11-2013 n°: 50020110100059 y CAID+D n°50120110100538), and Consejo Nacional de Investigaciones Científicas y Tecnicas (CONICET) (project PIP 114 20110100400) of Argentina for their financial support. The research leading to these results was performed as part of the “Value through Intensive and Efficient Fibre Supply” (EffFibre) research programme of the Finnish Bioeconomy Cluster (FIBIC – former Forestcluster Ltd), Finland. The authors also wish to thank Metsä Fibre Oy and Tekes – the Finnish Funding Agency for Technology and Innovation – for their financial support.
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©2016 by De Gruyter
Artikel in diesem Heft
- Frontmatter
- Original Articles
- Profiles of alkali concentration and galactoglucomannan degradation in kraft impregnation of Scots pine wood: Experimental observations and modeling
- Solvent screening for the fractionation of industrial kraft lignin
- Pilot-scale demonstration of SPORL for bioconversion of lodgepole pine to bioethanol and lignosulfonate
- Interrelationship between lignin-rich dichloromethane extracts of hot water-treated wood fibers and high-density polyethylene (HDPE) in wood plastic composite (WPC) production
- A new cis-p-coumaroyl flavonol glycoside from the inner barks of Sophora japonica L.
- Modification of poplar wood with glucose crosslinked with citric acid and 1,3-dimethylol-4,5-dihydroxy ethyleneurea
- Influence of atmospheric pressure plasma treatments on the surface properties of ligno-cellulosic substrates
- Superhydrophobic conductive wood with oil repellency obtained by coating with silver nanoparticles modified by fluoroalkyl silane
- Wettability and swelling of acetylated and furfurylated wood analyzed by multicycle Wilhelmy plate method
- Pre-grading of spruce logs containing frozen and unfrozen water by means of frequency-based nondestructive testing (NDT)
- Cork structural discontinuities studied with X-ray microtomography
Artikel in diesem Heft
- Frontmatter
- Original Articles
- Profiles of alkali concentration and galactoglucomannan degradation in kraft impregnation of Scots pine wood: Experimental observations and modeling
- Solvent screening for the fractionation of industrial kraft lignin
- Pilot-scale demonstration of SPORL for bioconversion of lodgepole pine to bioethanol and lignosulfonate
- Interrelationship between lignin-rich dichloromethane extracts of hot water-treated wood fibers and high-density polyethylene (HDPE) in wood plastic composite (WPC) production
- A new cis-p-coumaroyl flavonol glycoside from the inner barks of Sophora japonica L.
- Modification of poplar wood with glucose crosslinked with citric acid and 1,3-dimethylol-4,5-dihydroxy ethyleneurea
- Influence of atmospheric pressure plasma treatments on the surface properties of ligno-cellulosic substrates
- Superhydrophobic conductive wood with oil repellency obtained by coating with silver nanoparticles modified by fluoroalkyl silane
- Wettability and swelling of acetylated and furfurylated wood analyzed by multicycle Wilhelmy plate method
- Pre-grading of spruce logs containing frozen and unfrozen water by means of frequency-based nondestructive testing (NDT)
- Cork structural discontinuities studied with X-ray microtomography
