Dissolution of lignocellulosic materials and its constituents using ionic liquids—A review

Mäki‐Arvela, Päivi; Anugwom, Ikenna; Virtanen, Pekka; Sjöholm, Rainer; Mikkola, Jyri‐Pekka

doi:10.1016/j.indcrop.2010.04.005

Cited by 509 publications

(311 citation statements)

References 86 publications

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“…The conversion of biomass, very often wood, into industrially useful compounds can also be performed with the use of supercritical methanol or ethanol (Minami and Saka 2003;Poudel and Oh 2012), subcritical water (Matsunaga et al 2008) or ionic liquids (Maki-Arvela et al 2010). The main reactions occurring during liquefaction are the degradation of biomass ingredients, esterification and polycondensation.…”

Section: Introductionmentioning

confidence: 99%

Biopolyols obtained via crude glycerol-based liquefaction of cellulose: their structural, rheological and thermal characterization

et al. 2016

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In this work lignocellulose biomass liquefaction was used to produce biopolyols suitable for the manufacturing of rigid polyurethane foams. In order to better evaluate the mechanism of the process, pure cellulose was applied as a raw material. The effect of time and temperature on the effectiveness of liquefaction and the parameters of resulting biopolyols were characterized. The prepared materials were analyzed in terms of their chemical structure, rheology, thermal and oxidative stability, and basic physical and mechanical properties that are important from the point of view of polyurethane manufacturing. The optimal parameters for the biopolyol production with a 94 % yield were achieved at 150°C for a 6-h reaction duration. The obtained polyols were characterized by the hydroxyl number of 643 mg KOH/g and enhanced thermal and oxidative stability compared to the polyols obtained at lower temperatures, which is associated with the altered mechanism of liquefaction. The results of rheological tests, analyzed with the use of Ostwald-de Waele and Herschel Bulkley models, revealed that the prepared biopolyols can be classified as pseudoplastic fluids with the viscosity values similar to those of commercially available products. Rigid foams obtained via partial substitution of petrochemical polyol with prepared biobased one were characterized by slightly increased apparent density and average cell size comparing to unmodified materials. The best mechanical performance was observed for the sample containing 35 wt% of biopolyol in the polyol mixture, which indicates a synergistic effect between the applied polyols. The applied modification delayed thermal degradation of foams due to changes in thermal decomposition process. In conclusion, the presented work confirms that lignocellulose biomass liquefaction can be successfully applied as a manufacturing method of polyols later used in the production of polyurethanes.

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Section: Introductionmentioning

confidence: 99%

Biopolyols obtained via crude glycerol-based liquefaction of cellulose: their structural, rheological and thermal characterization

et al. 2016

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“…It was observed that solubility of cellulose could reach up to 13 wt% at 90°C in 7 h. Takegawa et al [34] Electrospinning of polymer solution has turned up as a dominant technology for the preparation of fibrous materials with high specific surface area, controllable compositions, and high porosities for various applications. Particularly, the electrospinning of biopolymers for fabrication of biofiber has attracted numerous interests not only because of the renewable resources but also due to the advantageous characteristics of these biomacromolecules such as biocompatibility, biodegradability, and significant specificity [5]. With the aim to replace commonly used noxious solvents, ILs have been investigated as new, nonvolatile, and nonflammable media for the electrospinning of biopolymers.…”

Section: Dissolution and Regeneration Of Cellulosic Biofilms From Il mentioning

confidence: 99%

“…Most of these materials are liquids at ambient or far below ambient temperature and have been widely used as a potential alternative to toxic, hazardous, volatile, and highly flammable organic solvents [1][2][3]. Various unique and attractive physicochemical properties of ILs, such as remarkable thermal and chemical stability [4,5], extremely low vapor pressure [6], high solvation interactions with inorganic and organic compounds [7], broad electrochemical window, and sharp ionic conductivity, make ILs promising candidates for the replacement of volatile organic compounds (VOCs) for polysaccharide dissolution and modification [8]. ILs have been accredited as "designer solvents" as their properties can be tailored by appropriate combinations of anions and cations [9].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the technological utilization of such materials for biocomposite manufacturing could be enhanced remarkably by their dissolution in ILs rather than the use of conventional organic solvents [5,21]. Various reports on dissolution of a wide variety of polysaccharides in ILs over the past 10-15 years suggested that by using ILs, efficient selective extraction of the components is also feasible [22].…”

Section: Introductionmentioning

confidence: 99%

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Green Composites from Ionic Liquid-Assisted Processing of Sustainable Resources: A Brief Overview

Mahmood¹,

Moniruzzaman²,

Yusup³

et al. 2017

Progress and Developments in Ionic Liquids

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The massive use of synthetic, petroleum-based polymeric composites has disturbed the fragile environmental equilibrium of our planet. Composites made solely from polysaccharides can offer unique intrinsic properties such as renewability, biodegradability, easy availability, eco-friendliness, facile processing, flexibility, and exciting physico-mechanical characteristics. The development of green processing of lignocellulosic materials and bio-based polymers such as cellulose, starch, chitin, and chitosan, the most abundant biorenewable materials on earth, is urgent from the perspectives of both environmental protection and sustainability in materials industries. Recently, the enormous potential of ionic liquids (ILs) as an alternative to ecologically harmful conventional organic solvents has been well recognized. Presently, a wide range of pronounced approaches have been explored to further improve the performance of ionic liquid-based processing of polysaccharides for green composite manufacturing. This review presents recent technological developments in which the advantages of ionic liquids as a dissolution medium for polysaccharides for production of plethora of green composites have been gradually realized.

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“…ILs containing the anion Cl -could be more efficient at disrupting inter-and intra-molecular hydrogen bonding in polymers. Additionally, a smaller anion was preferable because it diffuses faster within the lignocellulosic matrix, for example, Cl - (Mäki-Arvela et al 2010;Hu et al 2013). The small sized cation ([Hmp] + ) with a small sized anion (Cl -) being a strong hydrogen-bond acceptor made [Hmp]Cl an effective pretreatment solvent for lignocelluloses.…”

Section: An Insight Into Il Pretreatment Of Corn Stalkmentioning

confidence: 99%

Pyrrolidinium Ionic Liquids as Effective Solvents for Lignin Extraction and Enzymatic Hydrolysis of Lignocelluloses

et al. 2016

BioResources

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Dissolution of lignocellulosic materials and its constituents using ionic liquids—A review

Cited by 509 publications

References 86 publications

Biopolyols obtained via crude glycerol-based liquefaction of cellulose: their structural, rheological and thermal characterization

Biopolyols obtained via crude glycerol-based liquefaction of cellulose: their structural, rheological and thermal characterization

Green Composites from Ionic Liquid-Assisted Processing of Sustainable Resources: A Brief Overview

Pyrrolidinium Ionic Liquids as Effective Solvents for Lignin Extraction and Enzymatic Hydrolysis of Lignocelluloses

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