A process for enhancing the accessibility and reactivity of hardwood kraft-based dissolving pulp for viscose rayon production by cellulase treatment

Miao, Qingxian; Chen, Lihui; Huang, Liulian; Tian, Chen; Zheng, Linqiang; Ni, Yonghao

doi:10.1016/j.biortech.2013.12.040

Cited by 118 publications

(47 citation statements)

References 26 publications

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“…A number of applications were reported in treating lignocelluloses, for example, laccase-induced polymerization and depolymerization of lignin Gutiérrez et al 2012;Qiu and Chen 2012;Wang et al 2014aWang et al , 2015; xylanase treatment of fibers (Menon et al 2010;Shen et al 2011); endoglucanase treatment of bamboo fibers (Zhang et al 2012), dissolving pulp fibers (Miao et al 2014) and wood fibers (Hayashi et al 2005).…”

Section: Introductionmentioning

confidence: 98%

Preparation of cellulose nano-crystals through a sequential process of cellulase pretreatment and acid hydrolysis

Wen

Dong

et al. 2016

Cellulose

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In this paper, a cellulase pretreatment was studied prior to the acid hydrolysis to decrease the total acid usage during the cellulose nano-crystals (CNC) preparation from a bleached softwood kraft pulp. Cellulase pretreatment facilitates the subsequent acid hydrolysis to produce CNC with similar quality to that of the control, but at a lower sulfuric acid concentration. The underline mechanism is that cellulase pretreatment led to the formation of more carbonyl groups which can be oxidized into carboxyl groups in the subsequent acid hydrolysis, furthermore, more hydroxyl groups are exposed, thus esterification into sulfonic groups can be enhanced. The results showed that with a cellulase dosage of 4.8 u/g (based on dry pulp) in the pretreatment stage, the sulfuric acid concentration can be decreased from 64 to 40 wt% without compromising the quality of resulting CNC particles. Other results from charge properties, Fourier transform infrared spectroscopy (FT-IR) and transmission electron microscopy (TEM) analyses also supported the conclusions.

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Section: Introductionmentioning

confidence: 98%

Preparation of cellulose nano-crystals through a sequential process of cellulase pretreatment and acid hydrolysis

Wen

Dong

et al. 2016

Cellulose

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“…Cellulose is a homopolymer, which is linked by β-1,4-glycosidic bonds between the repeating units of β-Dglucose molecules. The linear glycan chain combined to form long packed microfibrils through intermolecular hydrogen bonds, dipole interactions, and van der Waals interaction (Harris and DeBolt 2010;Miao et al 2014). Hemicellulose is a branched short chain polymer, acting as a plasticizer and coating the microfibril surface.…”

Section: Introductionmentioning

confidence: 99%

Sodium Hydrogen Sulfite Pretreatment of Wood Pulp Waste for Enhancement of Enzymatic Efficiency

Liu¹,

Wang²,

Yang³

et al. 2014

BioResources

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aWood pulp waste is a type of industrial waste that has an enormous potential for fermentable sugar production. Efficient pretreatment is the key for enhancing the enzymatic efficiency. In this paper, sodium hydrogen sulfite pretreatment was performed on wood pulp waste to improve enzyme performance through sulfonation and hydrolysis reactions. Results showed that the enzymatic efficiency was greatly enhanced from 5.12 to 41.6% in terms of reducing sugar yield (RSY) under the optimum conditions: 6% NaHSO3, 2500 P-factor, 3/1 liquid to solid ratio, and cellulase charge of 35 FPU/g substrate. Mass balance showed that approximately 73% of glucose was recovered. The mechanism of sulfonation and hydrolysis of sodium hydrogen sulfite pretreatment were confirmed by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (X-RD), and scanning electron microscopy (SEM).

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“…Similarly, a viscosity decrease from 517 to 489 mL/g was reported by Henriksson et al (2005) when using endoglucanase to increase the reactivity of softwood sulphite dissolving pulp. Miao et al (2014) also observed a viscosity decrease from 634.8 to 490.8 mL/g after cellulase treatment of hardwood kraft-based dissolving pulp at a cellulase charge of 0.5 U/g.…”

Section: Resultsmentioning

confidence: 72%

“…Commercial kraft-based dissolving pulp production naturally fits into this concept (Yang et al 2012;Miao et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Viscosity Decrease by Cellulase Treatment of Bleached Hardwood Kraft-Based Dissolving Pulp

et al. 2015

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A dissolving pulp of low cellulose viscosity represents a pulp of high quality; hence, it is often necessary to decrease the initial dissolving pulp viscosity. One so-called environmentally friendly approach to further reducing the dissolving pulp viscosity is to treat the dissolving pulp with cellulase enzymes. In this study, the kinetics of the decrease in cellulose viscosity during a cellulase treatment was investigated. The study showed that the kinetics of the cellulose degradation during a cellulase treatment can be divided into at least two phases, where the initial phase is very fast and the final phase is very slow. The kinetic two-phase model for the viscosity degradation that has been developed in this project can be used to predict and control the final pulp viscosity of dissolving pulps.

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A process for enhancing the accessibility and reactivity of hardwood kraft-based dissolving pulp for viscose rayon production by cellulase treatment

Cited by 118 publications

References 26 publications

Preparation of cellulose nano-crystals through a sequential process of cellulase pretreatment and acid hydrolysis

Preparation of cellulose nano-crystals through a sequential process of cellulase pretreatment and acid hydrolysis

Sodium Hydrogen Sulfite Pretreatment of Wood Pulp Waste for Enhancement of Enzymatic Efficiency

Kinetics of Viscosity Decrease by Cellulase Treatment of Bleached Hardwood Kraft-Based Dissolving Pulp

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