Effect of Modified Cooking on Chemical Composition of Pulps from Eucalyptus globulus and Eucalyptus nitens

Antes, Rudine; Joutsimo, Olli

doi:10.15376/biores.10.1.210-226

Cited by 5 publications

(5 citation statements)

References 20 publications

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“…Based on the extractives content, Clones 5, 8 and 10 showed a larger potential for the production of cellulosic pulp, while Clones 1, 2, 3, 4, 6, 7 and 9 demonstrated less capacity. Extractives are undesired in the production of cellulosic pulp, as they hinder the penetration of reagents, thus increasing their consumption, decreasing the pulping yield, increasing bleaching costs and causing impregnations in the equipment and in the cellulosic pulp [42][43][44]. However, the nature of these compounds can have an influence in different ways.…”

Section: Ash Extractive and Lignin Contentsmentioning

confidence: 99%

Determination of the Chemical Composition of Eucalyptus spp. for Cellulosic Pulp Production

Vieira

Arriel

Zanuncio

et al. 2021

Forests

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The chemical composition of wood is important to assess the quality of this raw material for the industry of cellulosic pulp production. The purpose of this work was to determine the chemical composition of Eucalyptus spp. grown for cellulosic pulp production. Ten Eucalyptus spp. clones with six years of age, located in the municipality of Itamarandiba, Minas Gerais, Brazil, were used. Quantification was obtained for extractives, monosaccharides, uronic acids, acetates, lignin, ash and the phenolic composition of the extracts. In average, clones showed around 2.7% extractives, with a predominance of polar compounds soluble in ethanol and water; 27.7% lignin and 0.3% ash. Glucose was the main sugar detected (64.2%), followed by xylose (19.3%). The main components of the extractives were steroids, fatty acids and aromatic acids, followed by smaller amounts of substituted alkanoic acids, fatty alcohols, glycerol derivatives and triterpenes. The ethanol–water extracts presented total phenol contents ranging from 321.4 to 586.6 mg EAG/g of extract, tannins from 28.1 to 65.1 mg catechin/g of extract and flavonoids from 73.6 to 256.9 mg catechin/g of extract. Clones with a higher holocellulose amount and a lower lignin content showed a higher potential for cellulosic pulp production. These findings are important for the development of high-quality wood based on important traits for the pulp and paper sector.

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Section: Ash Extractive and Lignin Contentsmentioning

confidence: 99%

Determination of the Chemical Composition of Eucalyptus spp. for Cellulosic Pulp Production

Vieira

Arriel

Zanuncio

et al. 2021

Forests

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“…For all the modified cookings, the kappa number target was 17 ±0.5. The cooking procedures for all modified cooking methods are described in Table 2 and more details about the cooking conditions can be found in Antes and Joutsimo (2015a) …”

Section: Cooking Experimentsmentioning

confidence: 99%

“…Alkali concentration is very high at the beginning of the cooking but low at the end. This may cause carbohydrate degradation during cooking, resulting in an inefficient delignification rate (Antes and Joutsimo 2015a). Based on these observations, higher selectivity during cooking is needed.…”

Section: Introductionmentioning

confidence: 99%

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Fiber Surface and Paper Technical Properties of Eucalyptus globulus and Eucalyptus nitens Pulps after Modified Cooking and Bleaching

Antes¹,

Joutsimo²

2015

BioResources

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The SuperBatch™(SB), CompactCooking™(CC), and Lo-Solids™ (LS) modified cooking methods were evaluated relative to the cell wall surface and paper technical properties of bleached Eucalyptus globulus and Eucalyptus nitens. E. globulus pulps presented higher screened yield and brightness than E. nitens, which needed higher H-factor to reach a kappa number target. Independently of the cooking method or species, all the samples consumed similar amounts of ClO2 to reach a brightness of 90% ISO. E. nitens pulps showed lower carbohydrates and higher extractives content on the fiber surface, regardless of the cooking method. E. nitens presented slightly higher surface charge of the bleached pulps. Surface charges of CC and LS pulps were higher independently of cooked Eucalyptus species. Water retention value (WRV) for E. nitens pulps were higher than for E. globulus. No differences were observed in refinability of different cooking methods, however E. nitens pulps showed higher tensile and lower bulk compared to E. globulus. E nitens presented a thinner fiber cell wall than E. globulus. This seems to be more relevant for paper technical properties and WRV than fiber charge or surface composition. No correlation between surface composition, fiber surface properties, and paper technical properties among the cooking methods could be determined.

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“…The standard employed to measure the basic density of wood was TAPPI T 258 om 11 (2011). Details about the raw material are reported by Antes and Joutsimo (2015a).…”

Section: Raw Materialsmentioning

confidence: 99%

Effects of Modified Cooking on Fiber Wall Structure of E. globulus and E. nitens

Antes

Joutsimo²

2015

BioResources

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This work examined the impact of SuperBatch™ (SB), CompactCooking™ (CC), and Lo-Solids™ (LS) modified kraft pulping on the fiber wall structure of unbleached and bleached unrefined pulps of E. globulus and E. nitens. The kappa number target for all pulps was 17 ± 0.5. It was found that E. nitens had higher water retention values (WRVs) and fiber saturation point (FSP) for both bleached and unbleached pulps versus E. globulus. Fibril lateral aggregates width of unbleached pulps increased as WRV increased. After bleaching there was an inverse trend in correlation of WRV versus the lateral fibril aggregate width. The modified cooking methods or wood species did not have an influence on lateral fibril aggregate width. The higher WRV and FSP values for E. nitens were not reflected in the cumulative pore volume measurements including pore widths below 216 nm.

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Effect of Modified Cooking on Chemical Composition of Pulps from Eucalyptus globulus and Eucalyptus nitens

Cited by 5 publications

References 20 publications

Determination of the Chemical Composition of Eucalyptus spp. for Cellulosic Pulp Production

Determination of the Chemical Composition of Eucalyptus spp. for Cellulosic Pulp Production

Fiber Surface and Paper Technical Properties of Eucalyptus globulus and Eucalyptus nitens Pulps after Modified Cooking and Bleaching

Effects of Modified Cooking on Fiber Wall Structure of E. globulus and E. nitens

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