Advanced Studies on the Topochemistry of Softwood Fibres in Low-Consistency Refining as Analyzed by FE-SEM, XPS, and ToF-SIMS

Mou, Hongyan; Iamazaki, Eduardo T.; Zhan, Hui; Orblin, Elina; Fardim, Pedro

doi:10.15376/biores.8.2.2325-2336

Cited by 16 publications

(20 citation statements)

References 16 publications

(23 reference statements)

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“…Upon refining, at a given specific energy consumption SEC, the higher the refiner net power was, the higher was the amount of generated fines fraction. These results confirm findings by Mou et al (2013) that the increase in specific energy consumption caused the increase in fines content in refined pulp. Additionally, more rapid fines swelling was observed when refining intensity was higher (Fig.…”

Section: Resultssupporting

confidence: 91%

Swelling properties and generation of cellulose fines originating from bleached kraft pulp refined under different operating conditions

et al. 2017

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Cellulose fines are-in general-small particles removed from natural cellulose fibres during refining process which is typically carried out in papermaking industry. Fines have been recognized as a separate component of papermaking fibrous raw material since their properties differ considerably from those of cellulosic fibres. Fines are characterized by low dewatering ability, very high specific surface area, and high swelling ability. Knowledge about the possibility of effective control over fines generation and swelling during refining process are nowadays of key importance. Beside its significance in papermaking process (e.g. impact on paper structure and mechanical properties and dewatering properties of the pulp), nowadays the cellulose fines fraction is considered as a raw material for the production of novel materials e.g. microfibrilled cellulose and nanocellulose. The main objective of the presented study was to determine the impact of the most important refining parameters (e.g. net refining energy, rotor speed, and pulp consistency) which could be used to control the fines development and their swelling degree. On the basis of presented research results it may be concluded that the amount of the fines generated during refining process was mainly affected by the effective refining power (net power) and the rotational speed of the refiner rotor. Also, the final swelling degree of fines varies depending on the refining operating conditions used. It was found that the swelling degree of fines was mostly influenced by the rotational speed of the refiner rotor, refined pulp consistency, and-for very low consistency (1-2%)-also pulp volumetric flow rate through the refiner. As a result, it could be concluded that-for more effective control of the refining process-greater attention to the control of these parameters should be paid.

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Section: Resultssupporting

confidence: 91%

Swelling properties and generation of cellulose fines originating from bleached kraft pulp refined under different operating conditions

et al. 2017

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“…A similar phenomenon was found on softwood fiber surface after mechanical refining treatment because of xylan released from the fiber wall readsorbing on the surface. 16 It was probably due to the high surface carbohydrates covering bagasse fiber, as detected by XPS (Table 2). These substances were probably released from the collapsed inner fiber wall, which is shown in Figure 2d.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

“…14,15 The distribution of lignin on the surface of biomass materials has shown to directly influence the enzyme hydrolysis efficiency. 16 XPS and ToF-SIMS are surface sensitive techniques and able to supply the surface chemical composition and image the distribution of surface components in biomass and biomaterials. 19−24 Most recently, XPS and ToF-SIMS were successfully used to monitor the effect of the hydrotropic treatment of biomass by assessing surface lignin and carbohydrates after pretreatment and after enzyme hydrolysis.…”

Section: ■ Introductionmentioning

confidence: 99%

Topochemistry of Environmentally Friendly Pretreatments To Enhance Enzymatic Hydrolysis of Sugar Cane Bagasse to Fermentable Sugar

Mou

Heikkilä

Fardim

2014

J. Agric. Food Chem.

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In this work, dilute alkaline and alkaline peroxide pretreatments were conducted in comparison with hydrotropic pretreatment to improve the delignification of bagasse prior to enzymatic hydrolysis. The surface chemical composition of bagasse after pretreatments was investigated by X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). The surface distribution of lignin and extractives on the bagasse fiber was significantly changed by dilute alkaline, alkaline peroxide, and hydrotropic pretreatments. Hydrotropic pretreatment typically showed, other than the decrease of surface coverage by lignin and extractives, dramatic removal of xylan, thereby leading to more cellulose exposed on the fiber surface after pretreatment. Fiber morphology after pretreatments was more favorable for enzyme hydrolysis as well. However, the hydrotropic treatment had clear advantages because the enzymatic hydrolysis yields of glucan and xylan of pretreated bagasse were 83.9 and 14.3%, respectively.

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“…Kraft fibers are usually refined by one or more passes between the rotor and stator of a typical refiner. During refining, mechanical and hydraulic forces are employed to change the fibre characteristics, and this affects both the morphological structure of fibres and the macroscopic properties of paper (Mou et al 2013). Bunches of fibers within the suspension become squeezed and sheared between the working surfaces of the refiner (Hubbe et al 2007).…”

Section: Refiningmentioning

confidence: 99%

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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Advanced Studies on the Topochemistry of Softwood Fibres in Low-Consistency Refining as Analyzed by FE-SEM, XPS, and ToF-SIMS

Cited by 16 publications

References 16 publications

Swelling properties and generation of cellulose fines originating from bleached kraft pulp refined under different operating conditions

Swelling properties and generation of cellulose fines originating from bleached kraft pulp refined under different operating conditions

Topochemistry of Environmentally Friendly Pretreatments To Enhance Enzymatic Hydrolysis of Sugar Cane Bagasse to Fermentable Sugar

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

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