Dissolution mechanisms of wood cellulose fibres in NaOH–water

Moigne, Nicolas Le; Navard, Patrick

doi:10.1007/s10570-009-9370-5

Cited by 100 publications

(66 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cellulose can be dissolved in aqueous solvent such as NaOH in water (Isogai and Atalla 1998;Roy et al 2001;Roy et al 2003;Egal et al 2007; Moigne and Navard 2010) in a narrow range of temperatures and concentrations (from 7 to 10 wt% NaOH in water at -4 to -8°C). First dissolutions in NaOH were already done in 1939 by Sobue et al In addition, various aqueous alkaline solvent systems, such as aqueous NaOH/urea, NaOH/thiourea, NaOH/urea/ thiourea (Zhou and Zhang 2001;Ruan et al 2004;Zhang 2005, 2006;Cai et al 2007;Yan et al 2007;Qi et al 2008;Zhang et al 2010) LiOH/urea (Cai and Zhang 2005) and NaOH/ZnO (Vehviläinen et al 2008;Liu et al 2011) can dissolve cellulose completely, even cellulose grades with relatively high DP (DP = 500-900) (Ruan et al 2004;Cai and Zhang 2005;Qi et al 2008Qi et al , 2011.…”

Section: Introductionmentioning

confidence: 99%

Blending cellulose with polyethylene-co-acrylic acid in alkaline water suspension

et al. 2012

View full text Add to dashboard Cite

Alkaline solutions of cellulose and polyethylene-co-acrylic acid (PE-co-AA) were mixed in order to prepare homogeneous cellulose/PE-co-AA blends. Different mixing methods were tested and the evolution of solutions was characterized by rheological methods and optical microscopy. In addition to the solution stage studies, the precipitated dry blends were characterized by Differential Scanning Calorimetry, Scanning Electron Microscopy, Fourier Transform Infrared and Dynamic Mechanical Analysis. Mixing the solutions led to the formation of a suspension, consisting of PE-co-AA particles dispersed evenly throughout the cellulose solution. Based on the conducted studies, it became clear that a uniform quality and the best mixing were attained with a method in which the suspension was frozen and melted between the mixing. In dry blends the polymers were found to be mixed on 1 lm scale, and the crystallization temperature of the PE-co-AA phase was increased *6°C due to the nucleation ability of the cellulose phase.

show abstract

Section: Introductionmentioning

confidence: 99%

Blending cellulose with polyethylene-co-acrylic acid in alkaline water suspension

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Many studies have been carried out for the dissolution of cellulose and wood fibre in various types of solvents such as NaOH [7], N-methylmorpholine-Noxide (NMMO) [8], lithium chloride/urea/water [9] and ionic liquids [10][11][12][13]. The swelling process of cellulosic materials can improve the reactivity and accessibility of the cellulose.…”

Section: Introductionmentioning

confidence: 99%

Deep Eutectic Solvent as a Media in Swelling and Dissolution of Oil Palm Trunk

2017

MJAS

View full text Add to dashboard Cite

Pre-treatment is a crucial step in biomass processing prior to the hydrolysis or fermentation to bioethanol. Herein, the potential of deep eutectic solvent (DES) in the pretreatment of oil palm biomass were described. The mechanism of swelling and dissolution of oil palm trunk (OPT) was studied under optical microscopy. The OPT fibres were stirred and heated at 100 °C in choline chloride:glycerol (ChCl:Gly), choline chloride:ethylene glycol (ChCl:EG), ethylammonium chloride:glycerol (EAC:Gly) and ethylammonium chloride:ethylene glycol (EAC:EG) with 1:2 molar ratio each. All DESs tested had showed homogenous swelling and disintegration of small fragments interaction mode with OPT. There were more small fragments observed in EACbased DES compared to ChCl-based DES. This finding supports the result for the percentage of dissolution where OPT in EACbased DES recorded higher dissolution with 55% and 50% in EAC:EG and EAC:Gly respectively whereas ChCl-based DES recorded only 33% and 29% in ChCl:EG and ChCl:Gly, respectively. In ChCl-based DESs the fragmentations were accompanied by large unswollen section of fibres. The formation of small fragments indicates that the fibres experienced a fast dissolution. Therefore, the EAC-based DESs proved to be a better swelling and dissolution media for oil palm biomass pretreatment compared to ChCl-based DES.Keywords: deep eutectic solvent, oil palm biomass, dissolution, swelling, pre-treatment Abstrak Pra-rawat adalah satu langkah dalam pemprosesan biomas sebelum hidrolisis atau fermentasi kepada bioetanol. Disini, potensi pelarut eutektik (DES) dalam pra-rawat biomas kelapa sawit telah diterangkan. Mekanisma pembengkakan dan pemelarutan batang kelapa sawit (OPT) telah dikaji dengan mikroskop optik. Fiber OPT telah dikacau dan dipanaskan pada suhu 100 ºC dalam kolin klorida:gliserol (ChCl:Gly), kolin klorida:etilin glikol (ChCl:EG), etilammonium klorida: gliserol (EAC:Gly) dan etilammonium klorida: etilin glikol (EAC:EG) dengan kadar molar 1:2 setiap satu. Semua DES yang dikaji telah menunjukkan mod interaksi pembengkakan secara setara dan pecahan fragmen kecil dengan OPT. Lebih banyak fragmen kecil dapat dilihat dalam DES berasaskan EAC berbanding dengan DES berasaskan ChCl. Ini disokong oleh peratusan pelarutan dimana OPT dalam DES berasaskan EAC menunjukkan keputusan lebih tinggi dengan masing -masing 55% dan 50% dalam EAC:EG and EAC:Gly sementara DES berasaskan ChCl hanya menunjukkan masing -masing 33% dan 29% dalam ChCl:EG dan ChCl:Gly. Bagi DES berasaskan ChCl, fragmentasi adalah disertai dengan kehadiran fiber besar yang tiada pembengkakan. Pembentukkan fragmen kecil menunjukkan bahawa fiber mengalami pelarutan yang cepat. Oleh itu, DES berasaskan EAC terbukti lebih baik sebagai media pembengkakan dan pelarutan bagi OPT berbanding DES berasaskan ChCl.Kata kunci: pelarut eutektik, biomas kelapa sawit, pelarutan, pembengkakan, prarawat ISSN -2506 Emilia et al: DEEP EUTECTIC SOLVENT AS A MEDIA IN SWELLING AND DISSOLUTION OF OIL PALM TRUNK 21Introduction Deep eutectic...

show abstract

“…One method that changes the properties of pulp fibers and thus paper structure is alkali swelling (Klemm et al 1998). Alkali treatment changes the structure of the fiber wall and its pore via a ballooning phenomenon, which might have a positive effect on paper bulk (Lawson and Hertel 1974;Le Moigne and Navard 2010;Zhang et al 2013). Lawson and Hertel (1974) restored the pH of cotton fiber slurry to neutral by 1% acetic acid solution and rinsing in tap water before evaluation of fiber properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of Alkali Swelling and Beating Treatments on Properties of Kraft Pulp Fibers

Choi¹,

Kim²,

Cho³

2016

BioResources

View full text Add to dashboard Cite

Three alkali swelling methods were used to treat two kinds of kraft pulp fibers. The morphological and chemical properties of the treated fibers were elucidated in terms of alkali concentration, with the aim of developing bulky paper and conserving wood resources. The effects of beating before and after alkali swelling were examined. The water retention value of fibers increased when higher concentrations of NaOH were used for swelling. Alkali swelling increased fiber width, while fiber length decreased. With increasing NaOH concentration, fibers became curled or kinked; the crystalline structure changed from cellulose I to cellulose II, and the crystalline index decreased. Beating before and after the alkali swelling affected the swelling behavior of kraft pulps, but there was no distinct influence on the crystalline structure. The beating treatment before alkali swelling improved the alkali swelling of fiber. However, beating after the alkali treatment diminished the alkali swelling effects. In addition, the beating after alkali swelling straightened the curled fibers.

show abstract

Dissolution mechanisms of wood cellulose fibres in NaOH–water

Cited by 100 publications

References 30 publications

Blending cellulose with polyethylene-co-acrylic acid in alkaline water suspension

Blending cellulose with polyethylene-co-acrylic acid in alkaline water suspension

Deep Eutectic Solvent as a Media in Swelling and Dissolution of Oil Palm Trunk

Effects of Alkali Swelling and Beating Treatments on Properties of Kraft Pulp Fibers

Contact Info

Product

Resources

About