Suitability of wheat straw semichemical pulp for the fabrication of lignocellulosic nanofibres and their application to papermaking slurries

Espinosa, Eduardo; Tarrés, Quim; Delgado-Aguilar, Marc; González, Israel; Mutjé, Pere; Rodríguez, Alejandro

doi:10.1007/s10570-015-0807-8

Cited by 114 publications

(79 citation statements)

References 28 publications

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“…The diameter and specific surface of CNF were previously estimated in the literature (DelgadoAguilar et al 2015d;Espinosa et al 2016). Briefly, they can be calculated assuming two possible mechanisms (Rouger and Mutjé 1984;Carrasco et al 1996):…”

Section: Resultsmentioning

confidence: 99%

“…This step deserves special attention since it determines the whole energy consumption in the third and last step, which is fiber nanofibrillation. Regarding the variety of CNFs, TEMPO-oxidized (Saito et al 2007;Besbes et al 2011a), enzymatically hydrolyzed (Henriksson et al 2007;Pääkkö et al 2007), carboxymethylated (Ankerfors 2015), acid hydrolyzed (Zimmermann et al 2010) and mechanically prepared (Espinosa et al 2016) CNFs must be mentioned. These nomenclatures always refer to the pretreatment applied to the fiber.…”

Section: Introductionmentioning

confidence: 99%

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The feasibility of incorporating cellulose micro/nanofibers in papermaking processes: the relevance of enzymatic hydrolysis

et al. 2016

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Cellulose nanofiber (CNF) is becoming a topic of great interest among the industrial and academic communities, mainly due to their potential applications in very well-differentiated industrial sectors. Among this wide range of applications, papermaking is one of the most accepted and studied. However, it is widely known that the papermaking sector is forced to compete in markets where products do not have huge added value and production margins are very low. Therefore, papermakers are constantly looking for new technologies that balance efficiency and production costs. In line with this, the present work attempts to assay the enzymatic hydrolysis of cellulose fibers to obtain CNFs. Accordingly, pH, pulp consistency, treatment time, enzyme dosage and temperature were varied to find a combination of parameters that could lead to highly efficient CNF in terms of the mechanical properties of paper enhancement and production costs. For this, CNFs were applied to unrefined and refined bleached kraft pulps and their properties were assessed. The obtained results demonstrated that it is possible to obtain highly efficient CNFs from bleached pulp at affordable costs for papermakers. Moreover, it was found that the treatment time has a key role during the production of this CNF but at low enzyme dosages since the obtained results, in terms of intrinsic properties and reinforcing potential, for high enzyme charges did not vary significantly as time was increased. In sum, the present work offers a cost-efficient solution for the application of CNF in the production of paper from bleached pulp as well as a promising alternative to those conventional processes from a technical point of viewThe authors wish to acknowledge the financial support of the Economy and Competitiveness Ministry of the Government of Spain to project CTQ2013–48090–C2–2–R

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The feasibility of incorporating cellulose micro/nanofibers in papermaking processes: the relevance of enzymatic hydrolysis

et al. 2016

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“…The lowest specific surface area was found in Enz-CNF, which also corresponded to its lower cationic demand. CNF diameter was calculated from the cationic demand, carboxyl content, and specific surface area according to a methodology published previously (Espinosa et al 2015). The CNF diameter from TEMPO-oxidized fibers was very similar, about 15 nm.…”

Section: Resultsmentioning

confidence: 99%

“…Details for the characterization techniques are presented in González et al 2014. The theoretical specific surface area and diameter of the nanofibers was also estimated, following the methodology reported by Espinosa et al (2015). The production costs were based on the energy consumption of the equipment used during all of the stages of CNF fabrication: pulp disintegration, beating (if needed), and homogenization.…”

Section: Characterization and Cost Evaluation Of Cnfsmentioning

confidence: 99%

Approaching a Low-Cost Production of Cellulose Nanofibers for Papermaking Applications

Delgado-Aguilar¹,

Tovar²,

Farrés³

et al. 2015

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The use of cellulose nanofibers (CNF) as an additive in papermaking is an attractive alternative to improve paper's strength. However, the costs of CNF production need to be competitive compared to other approaches aimed at reducing mechanical beating. Five different types of CNFs were prepared following different pretreatments: TEMPO-mediated oxidation at basic and neutral conditions, soft acid hydrolysis, enzymatic treatment, and mechanical beating. All of the pretreated fibers were later passed through a high-pressure homogenizer. The resulting CNFs were each applied to a papermaking pulp to investigate their reinforcing ability. Results indicated that the TEMPO-oxidized CNFs offered the highest increase at the same nanofiber content compared to the other types of CNFs. However, an analysis of the cost of increasing paper's breaking length by 75% indicated that TEMPO-oxidized CNFs were more expensive than the other CNF grades, whereas CNFs from mechanical and acid pretreatment offered similar increases at lower prices. The results indicated that CNFs of high fibrillation degree were not necessary to induce dramatic increases in paper strength. This finding offers a new possibility for the escalation of CNF production to industrial levels with competitive prices.

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“…The nanofibrils were then characterized for the cationic demand, carboxyl 171 groups content, degree of polymerization, specific surface area and size. The 172 cationic demand (CD) was measured in a Mütek PCD 04 particle charge detector, 173 by using poly-DADMAC and Pes-Na cationic and anionic titrants, respectively, 174 according to the methodology followed by Espinosa et al (2016). The volume of6 anionic polymer consumed until the equipment registered 0 mV was used to 176 calculate the cationic demand according to eq.1 177 The carboxyl's content (C COOH ) was determined in triplicate by 187 conductometric titration of aqueous suspensions of CNF (acidified to pH of ca.…”

Section: Cnf Preparation and Characterization 146mentioning

confidence: 99%

Influence of TEMPO-oxidised cellulose nanofibrils on the properties of filler-containing papers

et al. 2016

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Suitability of wheat straw semichemical pulp for the fabrication of lignocellulosic nanofibres and their application to papermaking slurries

Cited by 114 publications

References 28 publications

The feasibility of incorporating cellulose micro/nanofibers in papermaking processes: the relevance of enzymatic hydrolysis

The feasibility of incorporating cellulose micro/nanofibers in papermaking processes: the relevance of enzymatic hydrolysis

Approaching a Low-Cost Production of Cellulose Nanofibers for Papermaking Applications

Influence of TEMPO-oxidised cellulose nanofibrils on the properties of filler-containing papers

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