Abstract
A mathematical model is presented, in which the yield loss (YL) and the decline in polymerization of carbohydrates is comprehended. The model is applicable to the treatment of cellulose and hemicelluloses in alkaline media, and it features the actions of peeling, stopping, and alkaline hydrolysis of the polymer chains. The peeling reaction is further subdivided into primary and secondary peeling depending on whether it originates from an initial reducing end-group (REG) or from an REG created by alkaline hydrolysis. Fitting the model to experimental data provides estimates of the various reaction rate constants. When available, simultaneous observations of the YL and the decrease in chain length contribute to the evaluation of the parameters. Alternatively, if the data are limited to the YL, the obtained parameter estimates allow for a projection of the time development of chain length. The model has been applied on data from two types of experiments: soda-anthraquinone treatment of cotton linters and kraft treatment of Scots pine. It was possible to evaluate the impact of the different processes on degradation as well as the portions of polymer chains possessing active or stabilized REGs.
Acknowledgments
The authors acknowledge the Finnish Bioeconomy Cluster Oy (FIBIC), The Finnish Funding Agency for Technology and Innovation (Tekes), Andritz Oy, Danisco Sweeteners Oy, Metsä Fibre Oy, Stora Enso Oyj, UPM, and the International Doctoral Programme in Bioproducts Technology for financial support.
References
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©2015 by De Gruyter
Articles in the same Issue
- Frontmatter
- Effect of hydroxide and sulfite ion concentration in alkaline sulfite anthraquinone (ASA) pulping – a comparative study
- Novel insight in carbohydrate degradation during alkaline treatment
- Activated hydrogen peroxide decolorization of a model azo dye-colored pulp
- Effects of inorganic salts on the degradation of 2,5-dihydroxy-[1,4]-benzoquinone as a key chromophore in pulps by hydrogen peroxide under basic conditions
- Analysis of degradation products in rayon spinning baths
- Effect of cellulase-assisted refining on the thermal degradation of bleached high-density paper
- Synthesis and characterization of functionalized 4-O-methylglucuronoxylan derivatives
- Hydrophobic materials based on cotton linter cellulose and an epoxy-activated polyester derived from a suberin monomer
- Depolymerization of cellulose during cold acidic chlorite treatment
- Enhanced stability of PVA electrospun fibers in water by adding cellulose nanocrystals
- Micro-nanoparticle gels obtained from bark for their use alone and with chitosan and Na-CMC in paper coatings
- Conversion of sulfur-free black liquor into fuel gas by supercritical water gasification
- Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatment
- Preparation of lignin-containing porous microspheres through the copolymerization of lignin acrylate derivatives with styrene and divinylbenzene
- Wood-based activated carbons for supercapacitors with organic electrolyte
- Functionality and physico-chemical characteristics of wheat straw lignin, Biolignin™, derivatives formed in the oxypropylation process
- Antioxidant activity of various lignins and lignin-related phenylpropanoid units with high and low molecular weight
- Characterization of technical lignins by NMR spectroscopy: optimization of functional group analysis by 31P NMR spectroscopy
- Chemical composition of volatiles extracted from indigenous tree species of Uganda: composition of bark extracts from Psorospermum febrifugum and Milicia excelsa
Articles in the same Issue
- Frontmatter
- Effect of hydroxide and sulfite ion concentration in alkaline sulfite anthraquinone (ASA) pulping – a comparative study
- Novel insight in carbohydrate degradation during alkaline treatment
- Activated hydrogen peroxide decolorization of a model azo dye-colored pulp
- Effects of inorganic salts on the degradation of 2,5-dihydroxy-[1,4]-benzoquinone as a key chromophore in pulps by hydrogen peroxide under basic conditions
- Analysis of degradation products in rayon spinning baths
- Effect of cellulase-assisted refining on the thermal degradation of bleached high-density paper
- Synthesis and characterization of functionalized 4-O-methylglucuronoxylan derivatives
- Hydrophobic materials based on cotton linter cellulose and an epoxy-activated polyester derived from a suberin monomer
- Depolymerization of cellulose during cold acidic chlorite treatment
- Enhanced stability of PVA electrospun fibers in water by adding cellulose nanocrystals
- Micro-nanoparticle gels obtained from bark for their use alone and with chitosan and Na-CMC in paper coatings
- Conversion of sulfur-free black liquor into fuel gas by supercritical water gasification
- Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatment
- Preparation of lignin-containing porous microspheres through the copolymerization of lignin acrylate derivatives with styrene and divinylbenzene
- Wood-based activated carbons for supercapacitors with organic electrolyte
- Functionality and physico-chemical characteristics of wheat straw lignin, Biolignin™, derivatives formed in the oxypropylation process
- Antioxidant activity of various lignins and lignin-related phenylpropanoid units with high and low molecular weight
- Characterization of technical lignins by NMR spectroscopy: optimization of functional group analysis by 31P NMR spectroscopy
- Chemical composition of volatiles extracted from indigenous tree species of Uganda: composition of bark extracts from Psorospermum febrifugum and Milicia excelsa