scholarly journals Chemical composition and fiber properties of fast-growing species in Latvia and its potential for forest bioindustry

2017 ◽  
Vol 66 (1) ◽  
pp. 27-32 ◽  
Author(s):  
Inese Sable ◽  
Uldis Grinfelds ◽  
Laura Vikele ◽  
Linda Rozenberga ◽  
Dagnija Lazdina ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Kraft Pulp ◽  
Lignin Content ◽  
Lodgepole Pine ◽  
Pulp Yield ◽  
Fine Content ◽  
Fast Growing ◽  
Pulp Fibres ◽  
Global Energy Supply ◽  
Fast Growing Species

AbstractBioenergy, including energy from wood, currently provides about 9–13% of the total global energy supply. Every fibre of fast-growing wood has a value for its potential use as a material in both pulp and paper and wood chemical industries. The aim of this study was to assess the chemical composition and fibre’s properties of fast-growing species in Latvia – aspen, hybrid aspen, lodgepole pine, poplar and willow. Results showed a variation of cellulose, lignin, extractives and ash contents among the species. Kraft pulp yield and amount of residual lignin were measured and properties of pulp fibres determined. Form factor and fine content in pulp were measured. Poplar and aspen wood had the highest content of cellulose, while lodgepole pine had the highest lignin content in wood and the longest kraft pulp fibres. Willow had 20% of fines in pulp. Individual results suggest the most suitable application of each species.

scholarly journals Inclusion of a pressurized acidolysis stage in chemical pulp bleaching

BioResources ◽  
2011 ◽  
Vol 6 (1) ◽  
pp. 823-840
Author(s):  
Samar K. Bose ◽  
Aaron Leavitt ◽  
Bertil Stromberg ◽  
Dipankar Kanungo ◽  
Raymond C. Francis
Keyword(s):  
Kraft Pulp ◽  
Model Compound ◽  
Lignin Content ◽  
Control Sample ◽  
Major Change ◽  
Pulp Yield ◽  
Pulp Bleaching ◽  
Lignin Model Compound ◽  
Chemical Pulp ◽  
Lignin Model

Hardwood soda-AQ pulps are believed to be rich in benzyl sugar ethers (BSE) that can be partially cleaved by aqueous acidic treatments. The aim of this investigation was to evaluate the effect of acidolysis on final bleached brightness for kraft and soda-AQ (SAQ) hardwood pulps. The increase in final brightness due to acidolysis at 110 °C was twice as high for a eucalyptus SAQ pulp as compared to the kraft pulp. An oxygen delignified maple C-SAQ pulp (carbonate pre-treated SAQ) was acidolyzed at 120 °C and pH 2.6 for 30 min. When 1.60% ClO2 + 0.25% H2O2 on pulp was used in DEPD final bleaching of the control sample a brightness of 91.5% was achieved. When only 1.00% ClO2 + 0.25% H2O2 on pulp was used for the acidolyzed sample a brightness of 92.0% was attained. Analyses of the maple pulp after the acidolysis showed no major change in lignin content, brightness, or pulp yield. The minor changes suggest that a facile reaction such as benzyl ether cleavage was responsible for the improved bleachability. Preliminary research involving a lignin model compound and commercial birch xylan showed that lignin-carbohydrate condensation products were generated under SAQ cooking conditions. Furthermore, a fraction of these lignin-carbohydrate moieties were subsequently cleaved by acidolysis at pH 2.5 and 105 °C.

Kraft pulp yields and wood properties of fertilized red spruce

1980 ◽  
Vol 10 (2) ◽  
pp. 183-189
Author(s):  
Robert K. Shepard Jr. ◽  
James E. Shottafer ◽  
Joseph M. Genco
Keyword(s):  
Kraft Pulp ◽  
Lignin Content ◽  
Volume Growth ◽  
Wood Properties ◽  
Kappa Number ◽  
Red Spruce ◽  
Unit Weight ◽  
Pulp Yield ◽  
Average Yield ◽  
Posttreatment Period

Red spruce (Picearubens Sarg.) near Princeton, Maine, U.S.A. fertilized with 168 kg N/h in 1970 increased in volume growth by nearly 50% over pretreatment rates during the 8-year posttreatment period; specific gravity was not affected. Average pulp yield per unit weight of posttreatment wood from fertilized trees was 1.9% greater than average yield from pretreatment wood, but rejects increased by 2.2% and kappa number by 17.7 mL. Average pulp yield per unit weight of posttreatment wood from unfertilized trees was 1.2% less than from pretreatment wood; rejects were 0.4% less and kappa number 2.6 mL higher. Fertilization increased the lignin content of posttreatment wood by about 3% and the resin content by 2%. Ash content also increased after fertilization.

scholarly journals Wood and Veneer Properties of Fast Growing Species from Batai, Eucalyptus and Kelampayan

2020 ◽  
Vol 4 (8) ◽  
pp. 65-71
Keyword(s):  
Lignin Content ◽  
Chemical Properties ◽  
Hot Water ◽  
Fast Growing ◽  
Eucalyptus Pellita ◽  
Veneer Sheet ◽  
Chemical Determination ◽  
Bottom To Top ◽  
Physical And Chemical ◽  
Fast Growing Species

Anatomical, physical, chemical and veneer properties of wood are important aspect that affect applicability of wood based product. This study is focused on three fast growing species of Batai (Paraserianthes falcataria), Eucalyptus (Eucalyptus pellita) and Kelampayan (Neolamarckia cadamba). All trees were cut into three height portion (bottom, middle and top) and wood disc samples are taken for anatomical, physical and chemical determination from each part of height. Meanwhile veneer properties were determined for veneer sheet after peeling and drying process. Eucalyptus shows the highest number of vessel for 16 mm2 area and near pith has higher frequency of vessel occurrence than near bark. The highest specific gravity for Batai, Eucalyptus and Kelampayan were found in bottom portion, followed by middle and top portion. Percentages of moisture content for this tree species is increased going from bottom to top portion. Cold and hot water, alcohol toluene, ash content and lignin content were found to have significant differences for top, middle and bottom of tree portion. The highest of percentage of veneer shrinkage was shown by Kelampayan veneer. Meanwhile, Batai veneer exhibited the lowest contact angle. As the conclusion, species and tree portions were found to be significantly affected for the anatomical, physical and chemical properties. For veneer analysis, species were found to affect veneer parameters. The results are of importance in order to optimize the production of plywood from fast growing species in Malaysia.

The Importance of Xylan for the Strength Properties of Spruce Kraft Pulp Fibres

Holzforschung ◽  
2001 ◽  
Vol 55 (6) ◽  
pp. 639-644 ◽  
Author(s):  
C. Schönberg ◽  
T. Oksanen ◽  
A. Suurnäkki ◽  
H. Kettunen ◽  
J. Buchert
Keyword(s):  
Tensile Strength ◽  
Chemical Composition ◽  
Fracture Energy ◽  
Kraft Pulp ◽  
Fibre Length ◽  
Strength Properties ◽  
Total Charge ◽  
Pulp Fibres ◽  
Considerable Impact

Summary In this work the role of xylan in spruce kraft pulp fibres was investigated by selectively removing the pulp fibre xylan and also by sorbing xylan onto the pulp fibres. The effects of xylan removal and sorption on fibre properties were measured and the chemical composition of the fibres and also that of the selectively removed xylans was analyzed. According to the results the xylanase could act on both sorbed and native xylan located on accessible fibre surfaces. Xylan was found to affect the strength properties of handsheets. The location and the charge of xylan had a considerable impact on the formation of interfibre bonds. Scott Bond-values correlated with the amount of surface xylan on fibre surfaces, whereas tensile strength was affected by the total amount of xylan and particularly by the total charge of the fibres. The fracture energy was determined by the combined effect of interfibre bonding ability and effective fibre length.

scholarly journals Pulping of different parts of whole green jute (C. Capsularies) plant by Kraft process

2013 ◽  
Vol 48 (2) ◽  
pp. 105-108
Author(s):  
MR Alam
Keyword(s):  
Chemical Composition ◽  
Kraft Pulp ◽  
Energy Requirement ◽  
Strength Properties ◽  
Pulp Yield ◽  
Cellulose Content ◽  
Bottom Part ◽  
Kraft Process ◽  
Refining Operation ◽  
Different Parts

The chemical composition of the top, middle and bottom part of green jute plant (GJP) are not alike, thus the yield and strength properties of the pulp produced may vary if these are pulped separately. The alpha -cellulose content increases, whereas hemi-cellulose, lignin, ash and extractives decrease from top to bottom part of GJP. The Kraft pulp yield and strength properties increases (except tear) from top to bottom part of GJP. The pulp produced from GJP was found to undergo rapid beating in comparison to those of muli bamboo, jute cuttings. This indicates less energy requirement during refining operation of the GJP pulp. Low extractive (pectin) and high alpha-cellulose is favorable for pulping. Bangladesh J. Sci. Ind. Res. 48(2), 105-108, 2013 DOI: http://dx.doi.org/10.3329/bjsir.v48i2.15740

scholarly journals Growth performance and lignin content of Acacia mangium Willd. and Acacia auriculiformis A. Cunn. ex Benth. under normal and stressed conditions

2017 ◽  
Vol 63 (No. 8) ◽  
pp. 381-392
Author(s):  
Asif Muhammad Javed ◽  
Govender Nisha Thopla ◽  
Ang Lai Hoe ◽  
Ratnam Wickneswari
Keyword(s):  
Organic Matter ◽  
Soil Temperature ◽  
Growth Performance ◽  
Lignin Content ◽  
Acacia Mangium ◽  
Water Holding Capacity ◽  
Acacia Auriculiformis ◽  
Fast Growing ◽  
Water Holding ◽  
Fast Growing Species

Acacia mangium Willdenow and Acacia auriculiformis A. Cunningham ex Bentham are fast-growing species with wide environmental adaptability. Fast-growing species which thrive in otherwise non-arable problematic soil and which hold the added advantage of improving the condition of the soil, can be used to increase production area, and, thus, are highly desired. We investigated the growth performance and lignin content under normal and stressed conditions for these Acacia mangium Willd. and Acacia auriculiformis A. Cunn. ex Benth. Normal growing conditions was represented by fertile soil, high water-holding capacity due to low soil drainage, high organic matter, low soil temperature, overall consistent rainfall and relatively milder temperatures, whilst stressed conditions were achieved with a sandy soil with low fertility, low water-holding capacity due to high drainage and low organic matter, and high soil temperature accompanied by inconsistent monthly temperature and rainfall. Growth performance under normal conditions was significantly better compared to the stressed conditions. A. mangium performed better than A. auriculiformis under the normal conditions. However A. auriculiformis performed better under stressed conditions due to better adaptability. The lignin content under normal conditions fluctuated from one DBH class to another. As for the stress conditions, A. mangium exhibited incremental increases in lignin content with increasing biomass. In contrast, lignin content in A. auriculiformis decreased with increasing biomass. The differences in performance may be attributable to both the micro- and macro-environments and adaptive differences between the two species. For growth under normal conditions, A. mangium appears to be the superior choice, whereas for problematic soils, A. auriculiformis can be recommended. However, for the selection of superior plants with a combination of desired growth rates and lower lignin content the breeding of interspecific hybrids would be a desirable approach.

Comprehensive evaluation of kraft pulp properties from fast-growing woods

TAPPI Journal ◽  
2010 ◽  
Vol 9 (6) ◽  
pp. 34-39
Author(s):  
AIYU QU ◽  
YANHUI AO ◽  
JUN YAN ◽  
GUIGAN FANG
Keyword(s):  
Kraft Pulp ◽  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Evaluation Index System ◽  
Evaluation Index ◽  
Wood Cellulose ◽  
Fuzzy Matrix ◽  
Fast Growing ◽  
Pulp Properties ◽  
Evaluation Index Systems

To develop new wood cellulose resources and fast-growing pulpwood plantation fiber sources, it is very important to evaluate their pulping properties. A comprehensive multi-index pulping-suitability evaluation model is investigated in this paper by considering four fast-growing wood species. First, a new evaluation-index system for kraft pulp was developed based on traditional evaluation-index systems. Then, the membership degree of every index was analyzed to obtain a fuzzy matrix. The proportional contribution of each parameter to the main pulping properties could then be determined. Finally, a comprehensive evaluation model of kraft pulp properties was developed. The model is reliable compared with traditional assessment methods. The results confirmed the feasibility and rationality of developing new wood cellulose resources and fast-growing pulpwood plantations using fuzzy comprehensive evaluations.

Genetic control of kraft pulp yield in Eucalyptus globulus

2010 ◽  
Vol 40 (5) ◽  
pp. 917-927 ◽  
Author(s):  
Desmond J. Stackpole ◽  
René E. Vaillancourt ◽  
Geoffrey M. Downes ◽  
Christopher E. Harwood ◽  
Brad M. Potts
Keyword(s):  
Genetic Control ◽  
Eucalyptus Globulus ◽  
Kraft Pulp ◽  
Near Infrared ◽  
Genetic Correlations ◽  
Basic Density ◽  
Pulp Yield ◽  
Narrow Sense Heritability ◽  
Selection Gradients ◽  
Economic Worth

Pulp yield is an important breeding objective for Eucalyptus globulus Labill., but evaluation of its genetic control and genetic correlations with other traits has been limited by its high assessment cost. We used near infrared spectroscopy to study genetic variation in pulp yield and other traits in a 16-year-old E. globulus trial. Pulp yield was predicted for 2165 trees from 467 open-pollinated families from 17 geographic subraces. Significant differences between subraces and between families within subraces were detected for all traits. The high pulp yield of southern Tasmanian subraces suggested that their economic worth was previously underestimated. The narrow-sense heritability of pulp yield was medium (0.40). The significant positive genetic correlation between pulp yield and diameter (0.52) was at odds with the generally neutral values reported. The average of the reported genetic correlations between pulp yield and basic density (0.50) was also at odds with our nonsignificant estimate. Pulp yield of the subraces increased with increasing latitude, producing a negative correlation with density (–0.58). The absence of genetic correlations within subraces between pulp yield and density suggests that the correlation may be an independent response of the two traits to the same or different selection gradients that vary with latitude.

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