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 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.

Development of near infrared reflectance analysis calibrations for estimating genetic parameters for cellulose content in Eucalyptus globulus

2002 ◽  
Vol 32 (1) ◽  
pp. 170-176 ◽  
Author(s):  
C A Raymond ◽  
L R Schimleck
Keyword(s):  
Eucalyptus Globulus ◽  
Kraft Pulp ◽  
Near Infrared ◽  
Genetic Correlations ◽  
Basic Density ◽  
Pulp Yield ◽  
Cellulose Content ◽  
Infrared Reflectance ◽  
Near Infrared Reflectance ◽  
Reflectance Analysis

Determining kraft pulp yield in the traditional way is slow and expensive, limiting the numbers of samples that may be processed. An alternative is to use a secondary standard, such as cellulose content of the wood, which is strongly correlated with kraft pulp yield. The feasibility and efficiency of predicting cellulose content using near infrared reflectance (NIR) analysis was examined for Eucalyptus globulus Labill. Calibrations for NIR prediction of cellulose content indicated that NIR analysis could be used as a reliable predictor. Standard errors of calibration were 1% or lower, and there was excellent agreement between laboratory and predicted cellulose values. Cellulose content was under moderate genetic control (h2 ranging from 0.32 to 0.57), and genetic correlations with tree diameter and basic density were variable (ranging from –0.11 to –0.51 and –0.33 to 0.67, respectively). The advantages, disadvantages, and potential applications of NIR analysis for predicting cellulose content are examined.

Radial variation in Kraft pulp yield and cellulose content in Eucalyptus globulus wood across three contrasting sites predicted by near infrared spectroscopy

2012 ◽  
Vol 42 (8) ◽  
pp. 1577-1586 ◽  
Author(s):  
Geoffrey M. Downes ◽  
Christopher E. Harwood ◽  
John Wiedemann ◽  
Nick Ebdon ◽  
Helen Bond ◽  
...  
Keyword(s):  
Eucalyptus Globulus ◽  
Kraft Pulp ◽  
Near Infrared ◽  
Radial Variation ◽  
Site Quality ◽  
Small Samples ◽  
Annual Rainfall ◽  
Pulp Yield ◽  
Cellulose Content ◽  
Radial Sampling

There is little published information on the variability of pulp yield within eucalypt stems. This is primarily due to the difficulty in measuring pulp yield in small samples, especially those obtained nondestructively. Thus, information of the effect of site, climate, and silviculture on pulp yield variability is lacking, minimizing its consideration in the economic optimization of pulpwood production. Near infrared spectroscopic measurement of pulp yield directly from intact wood surfaces at a small, radial sampling interval provides forest managers with opportunities to better understand and manage its sources of variability. Calibrations based on solid wood samples were constructed to describe radial variation in Kraft pulp yield and cellulose content using intact wood samples from Eucalyptus globulus Labill. Plantations at three sites with contrasting annual rainfall were studied. Pulp yield and cellulose content were higher at the more productive, wetter sites. Outer wood near the cambium had pulp yield values up to 8% higher than those at the pith. There was no clear intra-annual cycle of variation. The more productive sites exhibited significantly steeper pith-to-bark increases in pulp yield than the driest site. This has implications for optimizing pulp productivity by considering rotation length and site quality.

Enhancement of eucalypt pulp yield through extended impregnation cooking

2018 ◽  
Vol 33 (2) ◽  
pp. 175-185 ◽  
Author(s):  
Gustavo B. de Souza ◽  
Jorge Luiz Colodette ◽  
Fernando José Borges Gomes ◽  
Danila Morais de Carvalho
Keyword(s):  
Chlorine Dioxide ◽  
Kraft Pulp ◽  
Strength Properties ◽  
Kraft Pulping ◽  
Kappa Number ◽  
Pulp Yield

AbstractThe improvement caused by eucalypt chip impregnation on kraft pulping performance was assessed for terminating the cook at kappa in the range of 15–27 and at controlled residual effective alkali (REA) of 6–8 g/L NaOH. Extended impregnation cooking of eucalypt chips (EIC) increased about 1 %lignin- and HexA-freescreen yield gains in relation to conventional cooking (CC), regardless of kappa number in the range of 15–27. The EIC technology allows for cooking eucalypt wood to kappa number up to 27, without rejects production, but without significant improvement inlignin- and HexA-freescreen yield and with larger chlorine dioxide (ClO2) consume during bleaching. The optimum kappa number for both CC and EIC cooking was about 19 with similar refinability and strength properties for both technologies, CC and EIC. It was concluded that extended impregnation cooking is an attractive technique for enhancing bleached eucalypt Kraft pulp yield.

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.

Genetic improvement of kraft pulp yield in Eucalyptus nitens using cellulose content determined by near infrared spectroscopy

2004 ◽  
Vol 34 (11) ◽  
pp. 2363-2370 ◽  
Author(s):  
Laurence R Schimleck ◽  
Peter D Kube ◽  
Carolyn A Raymond
Keyword(s):  
Kraft Pulp ◽  
Near Infrared ◽  
Nir Spectroscopy ◽  
Tree Breeding ◽  
Pulp Yield ◽  
Cellulose Content ◽  
Direct Measure ◽  
Eucalyptus Nitens ◽  
Wet Chemistry ◽  
Genetic Gains

Eucalyptus nitens (Deane & Maiden) Maiden (shining gum) is widely grown for kraft pulp production in many cool temperate regions of the world. Improving the kraft pulp yield of this species is important for increasing plantation profitability, but traditional assessment is slow and expensive. Cellulose content, which is strongly correlated with pulp yield, has been used as an alternative in tree breeding programs. However, a direct measure of cellulose content still relies on wet chemistry, limiting the number of samples that can be processed and the subsequent gains that can be made in a tree breeding program. An indirect method such as near infrared (NIR) spectroscopy provides a large increase in the numbers of samples that can be analysed. In this study, the genetic gains in cellulose content of E. nitens were compared using cellulose content, determined using wet chemistry and predicted by NIR calibrations based on different sampling intensities. Genetic gains based on NIR-predicted cellulose content were high, and a large proportion of the gain was achievable using a direct measure of cellulose. Calibrations were robust and generally could be reliably used across sites. NIR-predicted cellulose is highly heritable, with heritabilities comparable to or better than direct measures of cellulose.

scholarly journals Cellulose content as a selection trait in breeding for kraft pulp yield in Eucalyptus urophylla

2009 ◽  
Vol 66 (7) ◽  
pp. 711-711 ◽  
Author(s):  
Nguyen D. Kien ◽  
Tran H. Quang ◽  
Gunnar Jansson ◽  
Chris Harwood ◽  
David Clapham ◽  
...  
Keyword(s):  
Kraft Pulp ◽  
Pulp Yield ◽  
Cellulose Content ◽  
Eucalyptus Urophylla

Evaluation of Lignin Syringyl/Guaiacyl Ratio in Eucalyptus Camaldulensis across Three Diverse Sites Based on near Infrared Spectroscopic Calibration Modelling with Five Eucalyptus Species and its Impact on Kraft Pulp Yield

2016 ◽  
Vol 24 (6) ◽  
pp. 529-536 ◽  
Author(s):  
Payyavula Ramadevi ◽  
Deepak V. Hegde ◽  
Mohan Varghese ◽  
Rathinam Kamalakannan ◽  
Suraj P. Ganapathy ◽  
...  
Keyword(s):  
Kraft Pulp ◽  
Near Infrared ◽  
Gas Chromatography Mass Spectrometry ◽  
Pulp Yield ◽  
Calibration Plot ◽  
Eucalyptus Species ◽  
Calibration Model ◽  
Cellulose Content ◽  
Pyrolysis Gas ◽  
G Ratio

Lignin composition [syringyl/guaiacyl (S/G) ratio] and cellulose content in wood have an important bearing on pulp yield. This paper deals with the development of a calibration model for S/G ratio using five Eucalyptus species from different sites by diffuse reflectance near infrared spectroscopy. The model was constructed with 120 samples covering an S/G ratio range from 1.8 to 3.6, determined by pyrolysis-gas chromatography-mass spectrometry. The calibration plot has an R2 value of 0.825 which was validated in E. camaldulensis, E. urophylla and E. pellita. Variation in S/G ratio was studied in more than 3000 E. camaldulensis trees across three diverse sites in southern India. The S/G ratio was lower in a low rainfall site (Mahabubnagar) compared to a higher rainfall site (Ongole). A positive correlation ( R2 = 0.72) was observed between S/G ratio and Kraft pulp yield in E. camaldulensis. Alkali consumption in Kraft pulping experiments was inversely proportional to the S/G ratio ( R2 = 0.914).

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