Pulping Yield and Delignification Kinetics of Heartwood and Sapwood of Maritime Pine

Esteves, Bruno; Gominho, Jorge; Rodrigues, José Carlos; Miranda, Isabel; Pereira, Helena

doi:10.1080/02773810500366656

Cited by 28 publications

(14 citation statements)

References 22 publications

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“…The pulp yield obtained with P. pinaster wood was less than that obtained with P. sylvestris following its higher extractive content and slightly higher lignin content, in accordance with values reported by Esteves et al (2005). The differences reported in Table 6 would be even slightly higher if a reference kappa number of e.g.…”

Section: Pulping Parameterssupporting

confidence: 77%

Characterization of Cypress Wood for Kraft Pulp Production

Santos¹,

Anjos²,

Morais³

et al. 2014

BioResources

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Wood samples of Cupressus arizonica, C. lusitanica, and C. sempervirens were evaluated for chemical, anatomical, and pulp characteristics as raw material for pulp production. Two 17-year-old trees per species were harvested, and wood samples were taken at a height of 2 m. Wood chips from Pinus pinaster (Portugal) and P. sylvestris (Finland) were used as references. C. arizonica differed from C. lusitanica and C. sempervirens with significantly lower (p < 0.05) tracheid diameter and wall thickness in the earlywood. The total extractives contents were 3.9%, 3.3%, and 2.5% for C. lusitanica, C. sempervirens, and C. arizonica, respectively, lower than the 5.1% for P. pinaster and 4.5% for P. sylvestris. Klason lignin content ranged from 33.0 to 35.6%, higher than the 28.0 to 28.7% for the pinewoods. The kraft pulp yields for C. arizonica, C. lusitanica, and C. sempervirens were 37.7%, 36.7%, and 38.7%, respectively, with kappa numbers of 32.0, 31.6, and 28.7, respectively; the yield values were 40.8% and 42.8%, with kappa numbers of 23.4 and 21.0, for P. pinaster and P. sylvestris, respectively. The cypress species are clearly different from pine in relation to wood pulping behavior. Among the cypress, C. sempervirens provided the best pulping results.

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Section: Pulping Parameterssupporting

confidence: 77%

Characterization of Cypress Wood for Kraft Pulp Production

Santos¹,

Anjos²,

Morais³

et al. 2014

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“…These differences could be associated to a higher accumulation of extractives in aged trees. Changes in the chemical composition of the tree as consequence of the ageing had also been reported in others species such as maritime pine (Esteves et al 2005), Eucalyptus globulus (Miranda and Pereira 2002) and larch (Gierlinger and Wimmer 2004).…”

Section: Characterization Of the Extractssupporting

confidence: 59%

Comparison of phenolic extracts obtained of Pinus radiata bark from pulp and paper industry and sawmill industry

Aspé¹,

Fernández²

2011

Maderas, Cienc. tecnol.

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Pinus radiata barks obtained from tress of different ages, as subproduct of pulp and paper (trees less than 10 years) and sawmill (trees between 20 to 25 years) industries, were used to produce extracts containing phenolic compounds. A factorial design 2 3 was used to evaluate the influence of the variables temperature (25 -35 ºC), solvent type (acetone -ethanol) and extraction time (1-12 h). The extracts were compared in their extraction yield (%), total phenols (by FolinCiocalteau), and radical scavenging activity (by DPPH). The extract obtained from old trunks presented a higher extraction yield than from young trees. The highest yield value was 2.56%, which was obtained using acetone as solvent for 12 h and 35°C. The highest concentration of phenol (5.84±0.18 g CE g extract -1 ), and scavenging activity (IP=86.1±4.4%) were also obtained for this type of extract. The extraction duration was the variable that most influenced the parameters studied. The bark's radical scavenging power was greater than BHT (40%) and slightly lower than ascorbic acid (92%), common commercial antioxidants.

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“…Stokes and Berthier (2000) and Berthier et al (2001) studied heartwood content in relation to its irregularity at the stem base and with the eccentric secondary growth in leaning trees. Esteves et al (2004Esteves et al ( , 2005 analyzed the accumulation of extractives in maritime pine heartwood and its influence on pulping.…”

Section: Introductionmentioning

confidence: 99%