Effect of Modified Cooking on Bleachability of Eucalyptus globulus and Eucalyptus nitens

Antes, Rudine; Joutsimo, Olli

doi:10.15376/biores.10.1.597-612

Cited by 4 publications

(4 citation statements)

References 13 publications

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“…As already known, the formation and degradation of hexenuronic acids are directly related to pulping conditions, mainly the H factor and alkali charge (Pedroso and Carvalho 2003;Gustavsson 2006). Antes and Joutsimo (2015) studied different kappa levels for E. nitens and E. globulus pulps and reported that the impact of HexA on the overall kappa number is more significant for pulp at kappa 14 than for pulp at kappa 18.…”

Section: Pulpingmentioning

confidence: 99%

Effect of Kappa Number Variation on Modified Pulping of Eucalyptus

Segura¹,

Santos²,

Sarto³

et al. 2016

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This work evaluated the impact of brownstock pulp kappa number variations on modified pulping process, oxygen delignification, bleaching, and the physical characteristics on bleached pulp. Wood chips of 6-yearold Eucalyptus grandis x Eucalyptus urophylla from Brazil were used. A modified pulping process was performed with the purpose of achieving two delignification levels on brownstock pulp: kappa 18 and kappa 15. Pulps were submitted to oxygen delignification and elemental chlorine-free (ECF) bleaching to achieve 89.5 ± 0.5% of ISO brightness. Subsequently, pulps were refined in four levels (0, 750, 1500, and 3000 rotations) for physical mechanical tests. Delignification increased after increasing the cooking H factor and alkali charge. As a result, delignification negatively impacted the pulping yields (from 56.1% to 55.0%) and the pulp viscosity (from 1,317 cm³/g to 1,227 cm³/g). Pulps with an initial kappa of 15 presented more efficient oxygen delignification and lower consumption of bleaching reagents. The final viscosity of these pulps were lower (899 cm³/g against 963 cm³/g), however, than that of the pulps with an initial kappa of 18. Furthermore, the pulps with a higher unbleached kappa demanded less refining energy and had lower capillarity. The other physical properties were not influenced by the brownstock delignification level.

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Section: Pulpingmentioning

confidence: 99%

Effect of Kappa Number Variation on Modified Pulping of Eucalyptus

Segura¹,

Santos²,

Sarto³

et al. 2016

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“…5) clearly show that E. nitens had significantly higher WRV values compared to the E. globulus fibers. Antes and Joutsimo (2015b) reported that E. nitens has higher hemicellulose content compared to E. globulus in bleached and unbleached pulps, which can explain the differences since higher amounts of hemicellulose absorb and retain more water in the cell wall.…”

Section: Fiber Total Charge and Superficial Chargementioning

confidence: 99%

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

Antes¹,

Joutsimo²

2015

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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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“…1 (Kojima et al, 2014;Antes and Joutsimo, 2015;Neiva et al, 2015;Zhou et al, 2015;Gallina et al, 2016;Hou et al, 2016;Pinto et al, 2016;Poletto, 2016) 2 (Ataç and Eroǧlu, 2013;Gulsoy and Tufek, 2013;Xiang and He, 2013;Cotana et al, 2014;Herrera et al, 2014;Castillo et al, 2015;Gulsoy and Ozturk, 2015;Reyes et al, 2016;Valenzuela et al, 2016) Gambar 3. (Sixta, 2008).…”

Section: Rendemen Pulp Belum Putih Bambu Dekortikasimentioning

confidence: 99%

Pembuatan dan Karakterisasi Dissolving Pulp Serat Panjang dari Bambu Duri (Bambusa blumeana)

Purwita

Sugesty

2018

J selulosa

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Preparation and Characterization of Long Fiber Dissolving Pulp from Spiny Bamboo (Bambusa blumeana)The need for long fiber dissolving pulp in Indonesia can only be met from imports. Bamboo is a nonwood plant and known as source of long fiber. This research aims to study the potential of spiny bamboo to be used as raw material for producing long fiber dissolving pulp. This research was conducted using two different types of raw materials preparation to produce bamboo chip and decorticated bamboo. The pulping process is carried out by pre-hydrolysis kraft and bleaching performed with two different bleaching sequences, i.e Do ED1 D2 and Do EpD1 D2 . Based on the experimental results, spiny bamboo has good potential to be used as raw material for dissolving pulp. Spiny bamboo belongs to long fibers with an average fiber length of 2.46 mm. The dissolving quality depends on the preparation of the raw material and the bleaching sequence. The yield of spiny bamboo dissolving pulp ranged from 37.97 - 40.76% with alpha cellulose content of 94.88 - 98.67%, and viscosity of 16.43 - 25.75 cP. Decorticated bamboo with bleaching sequence of Do EpD1 D2 produced the highest quality of dissolving pulp with the highest brightness and alpha cellulose were 89.61% ISO and 98.67%, respectively.AbstrakKebutuhan dissolving pulp serat panjang di Indonesia hanya dapat dipenuhi melalui impor. Bambu adalah tanaman nonkayu dan dikenal sebagai sumber serat panjang. Penelitian ini bertujuan untuk mempelajari potensi bambu duri untuk dijadikan bahan baku pembuatan dissolving pulp serat panjang. Penelitian ini dilakukan dengan dua jenis persiapan bahan baku yang berbeda untuk menghasilkan serpih bambu dan bambu dekortikasi. Proses pemasakan dilakukan dengan proses pra-hidrolisis kraft dan pemutihan dilakukan dengan dua urutan pemutihan yang berbeda, yaitu DoED1D2 dan DoEpD1D2. Berdasarkan hasil penelitian, bambu duri memiliki potensi yang baik untuk digunakan sebagai bahan baku pembuatan dissolving pulp. Bambu duri tergolong serat panjang dengan panjang serat rata-rata 2,46 mm. Kualitas dissolving pup yang dihasilkan tergantung dari persiapan bahan baku dan urutan pemutihan. Rendemen dissolving pulp bambu duri berkisar 37,97 - 40,76%, dengan kandungan selulosa alfa 94,88 - 98,67%, dan viskositas 16,43 - 25,75 cP. Bambu dekortikasi dengan urutan pemutihan DoEpD1D2 menghasilkan dissolving pulp paling unggul dengan derajat cerah dan selulosa alfa tertinggi berturut-turut 89,61 %ISO dan 98,67%.Kata kunci: dissolving pulp, bambu duri (Bambusa blumeana), serpih bambu, bambu dekortikasi, prahidrolisis kraft

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Effect of Modified Cooking on Bleachability of Eucalyptus globulus and Eucalyptus nitens

Cited by 4 publications

References 13 publications

Effect of Kappa Number Variation on Modified Pulping of Eucalyptus

Effect of Kappa Number Variation on Modified Pulping of Eucalyptus

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

Pembuatan dan Karakterisasi Dissolving Pulp Serat Panjang dari Bambu Duri (Bambusa blumeana)

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