Production of Dissolving Grade Pulps from Wood and Non-Wood Paper-Grade Pulps by Enzymatic and Chemical Pretreatments

Li, Dongfang; Ibarra, David; Köpcke, Vivianna; Ek, Monica

doi:10.1021/bk-2012-1107.ch009

Cited by 4 publications

(4 citation statements)

References 49 publications

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“…The critical value of η for dissolving grade pulp to manufacture high quality viscose rayon should not be less than 200 mL/g, which is in agreement with our results. 22 The lower viscosity of D.G.P. is caused by the processing conditions during pre-extraction, pulping and bleaching of the pulp and generally depends upon the pre-extraction method.…”

Section: Resultsmentioning

confidence: 99%

“…In almost all the cases, a decrease in the intrinsic viscosity of pulp was observed, with a lower amount of xylan, as well as lignin content. [22][23][24] The removal of hemicelluloses and subsequent peeling reactions in alkaline pulping resulted in the degradation of cellulosic chains. This happened because of the cleavage of glycosidic bonds, resulting in lower pulp viscosity in bleached dissolving grade pulp, compared to bleached pulp without any preextraction stage.…”

Section: Resultsmentioning

confidence: 99%

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Characterization of regenerated cellulose prepared from different pulp grades using a green solvent

Ghosh¹,

Haider²,

Sharma³

2019

Cellulose Chem. Technol.

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The cellulosic polysaccharide shows many potential applications due to its abundance, renewability, biodegradability and biocompatibility. Nowadays, the dissolution of this biopolymer via the alkaline based green solvent system has gained much attention in developing cellulose based composites for pharmaceuticals, waste water treatment or packaging applications. In this work, we aim at dissolving different grades of sustainable pulps in an aqueous NaOH/urea/thiourea system, involving the freeze thawing process, followed by re-precipitation with distilled water. This particular dissolving medium is chosen as it is economic and environment-friendly. Optical microscopy is used to study the extent of cellulose solubility in this system. Dissolving grade pulp (D.G.P.), with a degree of polymerization DP = 678.27, exhibits higher solubility after 3 freeze thawing cycles, compared to bleached hardwood pulp (B.G.P., DP = 990.67) and tissue grade pulp (T.G.P., DP = 1356.54). DP is further correlated with the average fibre length of the three samples obtained from a Morfi fibre analyser. Additionally, fibre identification through the microscopic slide staining procedure reveals that the long flexible softwood fibres present in the T.G.P. sample are responsible for its high DP. The solubility percentage calculated for D.G.P., B.G.P. and T.G.P. is 72.90%, 57.2% and 57%, respectively. The flow behaviour of each dissolved cellulosic sample is of Newtonian type at high shear rates, considering the same cellulose concentration at ambient temperature. X-ray diffraction patterns (XRD) and ATR-FTIR spectra indicate that the ordered crystalline structure of the samples is successfully destroyed and converted to cellulose II during the dissolution and regeneration process. Field emission scanning electron microscopy (FE-SEM) reveals porous structures for all samples, created due to phase separation of the cellulose solutions during regeneration with distilled water. Thus, the key finding of the study establishes that the regeneration via the green solvent can produce more amorphous cellulosic materials, which may be a suitable additive for papermaking, due to their enhanced bonding ability with wood fibres.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Characterization of regenerated cellulose prepared from different pulp grades using a green solvent

Ghosh¹,

Haider²,

Sharma³

2019

Cellulose Chem. Technol.

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“…Selanjutnya, kombinasi dari penggunaan enzim dan ekstraksi alkali menunjukkan efek sinergis pada penghilangan hemiselulosa (Ibarra, Kopcke and Ek, 2009;Gehmayr, Schild, and Sixta, 2011;. Penelitian yang telah dilakukan oleh Köpcke, Ibarra and Ek, (2008); Ibarra, Kopcke and Ek, (2009) (Ibarra et al, 2009;D. Li, Ibarra, et al, 2012).…”

Section: Metode Enzim Dan Kombinasi Atara Enzim Dan Metode Konvensionalunclassified

Dissolving Pulp dari Kayu dan Nonkayu: Tinjauan Proses Pembuatan dan Karakteristiknya

2020

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Pemanfaatan derivat selulosa menjadi viskosa rayon saat ini berkembang secara signifikan; dalam hal ini pulp khusus yang digunakan adalah dissolving pulp. Dissolving pulp ini memiliki karakteristik tertentu seperti kandungan selulosa tinggi (> 90%), kadar hemiselulosa rendah, lignin dan kandungan ekstraktif (kurang dari 10%), reaktivitas selulosa tinggi dengan tingkat distribusi berat molekul dan kecerahan tinggi, serta memiliki viskositas sekitar 200-300 dm3/kg. Saat ini, pembuatan dissolving pulp diarahkan untuk penggunaan bahan baku kayu dan non-kayu yang melimpah dengan menggunakan metode ramah lingkungan. Secara umum terdapat empat metode utama termasuk teknologi konvensional dan terbaru yang dapat digunakan untuk membuat dissolving pulp seperti: 1. Metode bisulfit menggunakan gas SO2 dengan yield sekitar 55 -75%; 2. Metode sulfit-soda yang mampu menghasilkan kandungan selulosa yang tinggi (hingga 96%); 3. Pra-hidrolisis kraft yang merupakan metode populer dalam pembuatan dissolving pulp dan 4. Konversi pulp kertas menjadi dissolving pulp. Dalam makalah ini dibahas pembuatan dissolving pulp menggunakan enzim seperti xilanase dan mono komponen endoglukanase dan kombinasi antara mekanik, kimia dan metode enzimatik. Kata kunci: dissolving pulp, pra-hidrolisis kraft, enzim, konversi pulp kertas

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“…Cellulose is the most abundant and bio-renewable raw material on earth, and it has a wide spectrum of applications. Regenerated cellulose and cellulose derivatives that are exploited in pharmaceutical, textile, food, and painting industries are normally produced using dissolving-grade pulp, which has much higher cellulose content and much lower hemicellulose, lignin, and minerals content than paper-grade pulp (Li et al 2012;Liu et al 2016). The traditional raw materials for dissolving pulp production include cotton linter and wood, whereas non-wood raw materials like bamboo, bagasse, and corn stalk have been used for the production of dissolving pulp (Liu et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Valorization of old corrugated container to dissolving pulp

Ghahrani

Ramezani

Kermanian

et al. 2022

BioRes

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As an alternative raw material for various cellulose derivatives, the current research studied the processing of old corrugated container (OCC) in the subsequent stages of homogenization (soda cooking) and purification (bleaching with hypochlorite). The properties were characterized in four different categories including chemical composition or purity, accessibility, reactivity, and structural features. Alkali delignification and a bleaching sequence of HEHEHEA were selected for homogenization and purification of pulp followed by characterization of the pulp properties. The dissolving pulp exhibited the following properties: yield, 78%; cellulose, hemicellulose, and lignin content, 90.5%, 7.76%, and 0.3%, respectively; alpha cellulose, 70%. Pulp reactivity measured with two experiments showed Fock reactivity value of 85.67% as well as iodine sorption value (ISV) of 94.95 g/g; accessibility represented by two tests of water retention (WRV) and alkali retention capacity (ARC) with 6.87 for the first and 6.1% for the latter, degree of polymerization (DP), 913.4; crystallinity index, 76.95%; and brightness, 72.87%. FTIR spectroscopy and Brunauer-Emmet-Teller (BET) isotherms were utilized to examine the modifications of OCC to dissolving pulp. The results indicated that the dissolving pulp produced from OCC as a raw material is suitable for DP applications of cellulose derivatives.

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Production of Dissolving Grade Pulps from Wood and Non-Wood Paper-Grade Pulps by Enzymatic and Chemical Pretreatments

Cited by 4 publications

References 49 publications

Characterization of regenerated cellulose prepared from different pulp grades using a green solvent

Characterization of regenerated cellulose prepared from different pulp grades using a green solvent

Dissolving Pulp dari Kayu dan Nonkayu: Tinjauan Proses Pembuatan dan Karakteristiknya

Valorization of old corrugated container to dissolving pulp

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