Rapid dissolution of lignocellulosic biomass in ionic liquids using temperatures above the glass transition of lignin

Li, Weiying; Sun, Ning; Stoner, Breena; Jiang, Xinyu; Lü, Xingmei; Rogers, Robin D.

doi:10.1039/c1gc15522a

Cited by 201 publications

(154 citation statements)

References 43 publications

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“…Acetatebased ILs have been found to have low viscosities, low melting points, low toxicity, and are less corrosive than chloride-based ILs (Fendt et al 2010). Previous studies also used acetate ions as a choice for the IL anion to dissolve lignocellulosic biomass (Swatloski et al 2002;Stöcker 2008;Cobb et al 2011;Li et al 2011). The strong hydrogen bond acceptance of the acetate anion enabled the destruction of the hydrogen network of the polymer chain in the coconut shell.…”

Section: Effect Of the Cations And Anions In The Ionic Liquids On Thementioning

confidence: 99%

“…Those studies showed that the percentage of lignin was increased by increasing the temperature above the Tg of lignin, which improved the breaking of the cellulose-lignin bonds. Li et al (2011) also stated that the yield of regenerated cellulose and lignin increased when the temperature increased from 160 to 190 °C. This indicated that a high temperature accelerates the separation of cellulose and increases the precipitation of free lignin.…”

Section: Effect Of Time and Temperaturementioning

confidence: 99%

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Lignin Extraction from Coconut Shell Using Aprotic Ionic Liquids

2017

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Coconut shell, a natural biopolymer, is available in high amounts as waste in many countries. It could potentially be a crucial renewable source of raw materials for the carbon fiber industry. In this study, a series of aprotic ionic liquids, [Bmim] Cl. The recyclability of the ionic liquids during the dissolution process (up to four times) was also scrutinized. The structure and properties of the untreated coconut shell and regenerated lignin were characterized by Fourier transform infra-red (FTIR) spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD) analysis, and proton nuclear magnetic resonance ( 1 H NMR).

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Section: Effect Of the Cations And Anions In The Ionic Liquids On Thementioning

confidence: 99%

Section: Effect Of Time and Temperaturementioning

confidence: 99%

Lignin Extraction from Coconut Shell Using Aprotic Ionic Liquids

2017

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“…Rayne and Mazza 18 achieved the rapid (less than 2 min) dissolution of both woody (oak, ponderosa pine and sumac wood) and herbaceous (grape stem, flax shives and triticale straw) biomass materials in [BMIM][Cl] with microwave irradiation. In the study by Li et al 19 , it was shown that 0.5 g of sugarcane bagasse (<0.25 mm particle size) dissolved much more rapidly (15-16 h) than 0.5 g of pine (46 h) in 10 g of [EMIM] [CH 3 COO] at 100 °C, even compared with smaller particle sizes of the latter (<0.125 mm particle size). In addition, they showed that rapid dissolution of bagasse could be achieved with heating at 175 °C for 10 min or at 185 °C for 5 min.…”

Section: Volume 111 | Number 11/12mentioning

confidence: 99%

critical review of ionic liquids for the pretreatment of lignocellulosic biomass

Reddy¹

2015

S. Afr. J. Sci.

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HOW TO CITE:Reddy P. A critical review of ionic liquids for the pretreatment of lignocellulosic biomass. S Afr J Sci. 2015;111(11/12), Art. #2015-0083, 9 pages. http://dx.doi.org/10. 17159/ sajs.2015/20150083 Ionic liquids have been the subject of active research over the course of the last decade and have in the past been touted as one of the most promising technologies for revolutionising the chemical and petrochemical industries. The sheer abundance of potential ionic liquid structures coupled with their tuneable physico-chemical properties has endeared ionic liquids to the scientific community across a broad range of disciplines with potential applications that include pharmaceuticals, electrolytes, thermal energy storage media and liquid mirror telescopes. Within the context of a biorefinery for the production of biofuels and other bio-based products from renewable resources, the unique abilities of some ionic liquids to selectively dissolve biomass components or whole native biomass have been demonstrated. This ability has sparked extensive investigations of ionic liquids for the pretreatment of different biomass types, particularly for the production of cellulosic biofuels. However, the esoteric nature of ionic liquids persists and constructing a fundamental framework for correlating ionic liquid structures with useful applications remains a significant challenge. In addition to the above, the more practical challenges of toxicity, high costs, high viscosities, low solids loading and complex recycling are key factors hindering the wide-scale uptake of ionic liquids as pretreatment solvents in a commercial biorefinery. This critical review provides insights from academic studies and the implications thereof for elevating ionic liquids from the status of 'promising' to 'commercialisable' in the pretreatment of biomass. It is vital that key hurdles for the commercialisation of ionic liquids in the form of high costs, high viscosities, poor water tolerance, toxicity, low solids loading and recovery/recycling be addressed.

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“…An examination of the reactivity of each type of ionic liquid with wood, focusing mainly on the ionic liquid having the ability to dissolve cellulose showed that the selection of adequate reaction conditions ensures the complete liquefaction of all components, including lignin, hemicellulose, and cellulose, irrespective of whether hardwood or softwood used [22][23][24][25][26][27]. However, cellulose and hemicellulose are easier to liquefy than lignin [28][29][30].…”

Section: Application In Chemical Use Dissolution and Component Separamentioning

confidence: 99%

Application of ionic liquids for effective use of woody biomass

Miyafuji

2015

J Wood Sci

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Ionic liquids are salts that have melting points around ambient temperature and unique characteristics, such as high solubility, extremely low volatility, incombustibility and low viscosity. Application of ionic liquids in wood processing technology has attracted attention and is expected to promote further use of wood. They are effective as wood-preserving agents to enhance decay-resistance and also improve fire resistance of wood. Ionic liquids have been used as reaction solvents for preparing various cellulose derivatives or composites with other materials. Attempts have been made to use ionic liquids in pretreatments for enzymatic hydrolysis when producing bio-ethanol from cellulose or wood. Ionic liquids also have been shown to be effective for dissolution of cellulose or wood, forming the basis for studies into the separation of cellulose, hemicellulose and lignin from wood. The effective separation of these components is essential for chemical use of wood, and ionic liquid treatment thus has potential as an enabling technique in biorefineries. Moreover, ionic liquids induce depolymerization of solubilized wood polymers, which may be applicable to the production of useful chemicals from wood polymers such as cellulose, hemicellulose and lignin.

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Rapid dissolution of lignocellulosic biomass in ionic liquids using temperatures above the glass transition of lignin

Cited by 201 publications

References 43 publications

Lignin Extraction from Coconut Shell Using Aprotic Ionic Liquids

Lignin Extraction from Coconut Shell Using Aprotic Ionic Liquids

critical review of ionic liquids for the pretreatment of lignocellulosic biomass

Application of ionic liquids for effective use of woody biomass

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