Abstract
Pulp and black liquor produced by alkaline sulfite anthraquinone (ASA) process were comprehensively characterized to evaluate the effects of ion concentration on the delignification and polysaccharide preservation. Scots pine wood meal was pulped at 160°C with a sulfite-to-hydroxide ion ratio of 0.75 and liquor-to-wood ratio of 200:1. Two concentration levels were studied in presence and absence of anthraquinone (AQ). Contrary to the expectations, already the lower concentration level (L-ASA) revealed rapid delignification in presence of AQ, while only moderate acceleration was obtained at the high concentration level (H-ASA). However, H-ASA liquor resulted in a slightly higher pulp yield of 1–2% (based on wood) but only in case of pulps with kappa numbers (KN) above 60. With progressing delignification, the yield advantage was gradually lost. The higher pulp yield at H-ASA conditions was mainly due to improved galactoglucomannan retention, which was around 2% on KN60 pulp and around 0.5% after prolonged delignification. The xylan content, on the other hand, was found to be 1% (based on wood) lower under H-ASA conditions compared to L-ASA conditions, which may be attributed to an increased solubility of short-chain polysaccharides at high alkali concentration.
Acknowledgments
The authors would like to acknowledge the Finnish Funding Agency for Technology and Innovation (Tekes) and FIBIC Ltd. 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