Abstract
The chemical composition of black liquors obtained from the soda-AQ pulping of birch (Betula pendula) sawdust was studied as a function of cooking time, effective alkali content, and hot-water pretreatment of the sawdust prior to delignification. Special attention was paid on the formation of lignin-derived materials and low-molecular-mass carbohydrate-derived degradation products containing aliphatic carboxylic acids. In the case of the hot-water-pretreated feedstock, less acetic acid and formic acid and more nonvolatile hydroxy acids (especially monocarboxylic acids) were obtained. The observations can be interpreted as a result of the extensive removal of hemicelluloses during the hot-water pretreatment.
Acknowledgments
Financial support within the framework of the FuBio JR2 Research Program (Finnish Bioeconomy Cluster, FIBIC) is gratefully acknowledged. Olli Byman and Petri Kilpeläinen from the Finnish Forest Research Institute (Metla) are gratefully acknowledged for providing necessary feedstock materials for the cooking experiments. Special thanks are due to Mrs. Marja Salo, Mr. Jukka Pekka Isoaho, Mr. Hannu Salo, and Mr. Hannu Pakkanen for their versatile help during the experimental work.
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©2015 by De Gruyter
Articles in the same Issue
- Frontmatter
- Original Articles
- Characterization of dissolved lignins from acetic acid Lignofibre (LGF) organosolv pulping and discussion of its delignification mechanisms
- Organic materials in black liquors of soda-AQ pulping of hot-water-extracted birch (Betula pendula) sawdust
- Effects of concentration and temperature on the rheological behavior of concentrated sodium lignosulfonate (NaLS) solutions
- Raman microscopic analysis of wood after treatment with the ionic liquid, 1-ethyl-3-methylimidazolium chloride
- Isolation and structural elucidation of norlignan polymers from the heartwood of Cryptomeria japonica
- Effect of ball milling on lignin polyesterification with ε-caprolactone
- Property enhancement of kenaf fiber composites by means of vacuum-assisted resin transfer molding (VARTM)
- Wood polypropylene composites prepared by thermally modified fibers at two extrusion speeds: mechanical and viscoelastic properties
- Numerical analysis of temperature profiles during thermal modification of wood: chemical reactions and experimental verification
- Fast online NIR technique to predict MOE and moisture content of sawn lumber
- Numerical study of the influence of veneer lathe checks on the elastic mechanical properties of laminated veneer lumber (LVL) made of beech
- Amination of pretreated ayous (Triplochiton scleroxylon) sawdust with two organosilanes: characterization, stability, and permselective property
- Damage evolution in wood – pattern recognition based on acoustic emission (AE) frequency spectra
- Mechanical stability of superhydrophobic epoxy/silica coating for better water resistance of wood
- Short Note
- Urea-formaldehyde resin penetration into Pinus radiata tracheid walls assessed by TEM-EDXS
- Obituary
- Professor Dr. Arnis Treimanis
Articles in the same Issue
- Frontmatter
- Original Articles
- Characterization of dissolved lignins from acetic acid Lignofibre (LGF) organosolv pulping and discussion of its delignification mechanisms
- Organic materials in black liquors of soda-AQ pulping of hot-water-extracted birch (Betula pendula) sawdust
- Effects of concentration and temperature on the rheological behavior of concentrated sodium lignosulfonate (NaLS) solutions
- Raman microscopic analysis of wood after treatment with the ionic liquid, 1-ethyl-3-methylimidazolium chloride
- Isolation and structural elucidation of norlignan polymers from the heartwood of Cryptomeria japonica
- Effect of ball milling on lignin polyesterification with ε-caprolactone
- Property enhancement of kenaf fiber composites by means of vacuum-assisted resin transfer molding (VARTM)
- Wood polypropylene composites prepared by thermally modified fibers at two extrusion speeds: mechanical and viscoelastic properties
- Numerical analysis of temperature profiles during thermal modification of wood: chemical reactions and experimental verification
- Fast online NIR technique to predict MOE and moisture content of sawn lumber
- Numerical study of the influence of veneer lathe checks on the elastic mechanical properties of laminated veneer lumber (LVL) made of beech
- Amination of pretreated ayous (Triplochiton scleroxylon) sawdust with two organosilanes: characterization, stability, and permselective property
- Damage evolution in wood – pattern recognition based on acoustic emission (AE) frequency spectra
- Mechanical stability of superhydrophobic epoxy/silica coating for better water resistance of wood
- Short Note
- Urea-formaldehyde resin penetration into Pinus radiata tracheid walls assessed by TEM-EDXS
- Obituary
- Professor Dr. Arnis Treimanis