The impact of ionic liquid pretreatment on the chemistry and enzymatic digestibility of Pinus radiata compression wood

Torr, Kirk M.; Love, Karen T.; Çetinkol, Özgül Persil; Donaldson, Lloyd; George, Anthe; Holmes, Bradley M.; Simmons, Blake A.

doi:10.1039/c2gc16362d

Cited by 87 publications

(71 citation statements)

References 53 publications

(94 reference statements)

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“…In the dissolution of beech and spruce wood at 115°C, [emim] [CH 3 COO] showed to be more suitable for the first one, but complete dissolution was observed for none of the examined biomasses even during a 72-hour process [29]. An incomplete dissolution of pine wood in this IL at 120°C and 155°C within 3 hours was also reported [30]. These findings were the opposite of those presented earlier by Singh et al [31].…”

Section: They Found Out That [Emim][cl] [Bmim][cl] and [Emim]contrasting

confidence: 56%

“…Cellulose in the pre-treated biomass is no longer constrained in a rigid structure and has similar level of the molecular flexibility as the surrounding hemicellulose [30]. By microscopic observations, Singh et al verified the precipitation of fibrous structures of cellulose (300-500 mM long) after addition of water [31].…”

Section: The Biomass Regeneration Processmentioning

confidence: 82%

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Ionic liquids as a tool for lignocellulosic biomass fractionation

Lopes

João

Morais

et al. 2013

sustain chem process

199

124

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Lignocellulosic biomass composes a diversity of feedstock raw materials representing an abundant and renewable carbon source. In majority lignocellulose is constituted by carbohydrate macromolecules, namely cellulose and hemicellulose, and by lignin, a polyphenilpropanoid macromolecule. Between these biomacromolecules, there are several covalent and non-covalent interactions defining an intricate, complex and rigid structure of lignocellulose. The deconstruction of the lignocellulosic biomass makes these fractions susceptible for easier transformation to large number of commodities including energy, chemicals and material within the concept of biorefinery. Generally, the biomass pre-treatment depends on the final goal in the biomass processing. The recalcitrance of lignocellulose materials is the main limitation of its processing once the inherent costs are excessively high for the conventional pre-treatments. Furthermore, none of the currently known processes is highly selective and efficient for the satisfactory and versatile use, thus, new methodologies are still studied broadly. The ionic liquid technology on biomass processing is relatively recent and first studies were focused on the lignocellulosic biomass dissolution in different ionic liquids (ILs). The dissolution in IL drives to the structural changes in the regenerated biomass by reduction of cellulose crystallinity and lignin content contrasting to the original biomass. These findings provided ILs as tools to perform biomass pre-treatment and the advantageous use of their specific properties over the conventional pre-treatment processes. This review shows the critical outlook on the study of biomass dissolution and changes occurred in the biomass during this process as well as on the influence of several crucial parameters that govern the dissolution and further pre-treatment process. The review of currently known methods of biomass fractionation in IL and aqueous-IL mixtures is also discussed here and perspectives regarding these topics are given as well.

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Section: They Found Out That [Emim][cl] [Bmim][cl] and [Emim]contrasting

confidence: 56%

Section: The Biomass Regeneration Processmentioning

confidence: 82%

Ionic liquids as a tool for lignocellulosic biomass fractionation

Lopes

João

Morais

et al. 2013

sustain chem process

199

124

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“…Beech and spruce wood were dissolved at 115 °C in [Emim] [CH 3 COO] for 72 h. Even after this long contact period, none of the wood samples were dissolved completely (Viell and Marquardt 2011). Similar results were found for pinewood dissolved in this IL at 120 °C and 155 °C for 3 h (Torr et al 2012). Another investigation was carried out under identical conditions for different types of ILs using spruce, silver fir, common beech, and chestnut wood chips (Yang et al 2010 COO].…”

Section: Dissolution Of Wood Biomass In Ionic Liquids (Ils)supporting

confidence: 71%

“…The disintegration and dissolution kinetics of different particle sizes of beech and spruce wood was investigated in [Emim][CH 3 COO] (Torr et al 2012). The authors concluded that the dissolution process of wood is size-independent.…”

Section: Particle Sizementioning

confidence: 99%

Catalytic Role of Ionic Liquids for Dissolution and Degradation of Biomacromolecules

Chowdhury¹,

Zain²,

Hamid³

et al. 2014

BioResources

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Natural biomacromolecules constitute a diverse feedstock, including carbohydrate-based polysaccharides (cellulose, hemicellulose, starch, agarose, and Konjac glucomannan) together with lignin -extracted mainly from biomass -and other protein based polymers, namely keratin, chitin, chitosan, and silk fibroin. The complex and heterogeneous chemical structure of biomacromolecules makes them difficult to dissolve and disintegrate into simpler molecules for further applications. In this regard, ionic liquids are potential solvents for the dissolution and modification of long chain biopolymers. This provides a promising pretreatment technology and is known to allow adequate extraction of biopolymers from natural sources. This paper highlights the properties of ionic liquids for their use as versatile solvents. This review provides a critical outlook regarding the influence of several process parameters that govern the fractionation of biomacromolecules into their constituent elements and further pretreatment processes. The performance of different types of ionic liquids for processing of biomacromolecules, focusing on their pertinent capability as catalysts to enhance the rate of hydrolysis, also is discussed in this article.

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“…More recently there have been reports on the enzymatic digestibility of recovered wood biomass after IL dissolution. Over 90% cellulose hydrolysis was obtained after Pinus radiata pretreatment with [Emim][Ac] at 120 °C for 180 min, using a 5% solid loading during pretreatment [138]. The authors demonstrated that the IL pretreatment induced compositional and structural changes in the wood, including extraction and deacetylation of the hemicellulose fraction and loss of lignin ether linkages.…”

Section: Ionic Liquid Pretreatmentmentioning

confidence: 92%