Microwave-assisted dissolution and delignification of wood in 1-ethyl-3-methylimidazolium acetate

Wang, Hui; Maxim, Mirela L.; Gurău, Gabriela; Rogers, Robin D.

doi:10.1016/j.biortech.2013.03.064

Cited by 52 publications

(28 citation statements)

References 15 publications

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“…18,19 Different strategies are followed, from disrupting the lignocellulosic cell wall structure without separation, [20][21][22][23] to selectively isolating lignin, hemicelluloses and cellulose. 15,24,25 While the ultimate goal of pretreatment for enzymatic hydrolysis and fermentation is the isolation of a maximum amount of fermentable sugar, process economics are influenced by a number of factors, such as the number of process steps, the cost and recyclability of additives or solvents, energy requirements, and reactor size, which all influence capital and/or operating costs. 26,27 Reactor size specifically is dictated by the biomass to liquid ratio and residence time.…”

Section: Introductionmentioning

confidence: 99%

Rapid pretreatment of Miscanthus using the low-cost ionic liquid triethylammonium hydrogen sulfate at elevated temperatures

et al. 2018

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Deconstruction with low-cost ionic liquids (ionoSolv) is a promising method to pre-condition lignocellulosic biomass for the production of renewable fuels, materials and chemicals. This study investigated process intensification strategies for ionoSolv pretreatment of Miscanthus × giganteus with the low-cost ionic liquid triethylammonium hydrogen sulfate ([TEA] [HSO 4 ]) in the presence of 20 wt% water, using high temperatures and a high solid to solvent loading of 1 : 5 g/g. The temperatures investigated were 150, 160, 170 and 180°C. We discuss the effect of pretreatment temperature on lignin and hemicellulose removal, cellulose degradation and enzymatic saccharification yields. We report that very good fractionation can be achieved across all investigated temperatures, including an enzymatic saccharification yield exceeding 75% of the theoretical maximum after only 15 min of treatment at 180°C. We further characterised the recovered lignins, which established some tunability of the hydroxyl group content, subunit composition, connectivity and molecular weight distribution in the isolated lignin while maintaining maximum saccharification yield. This drastic reduction of pretreatment time at increased biomass loading without a yield penalty is promising for the development of a commercial ionoSolv pretreatment process.

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Section: Introductionmentioning

confidence: 99%

Rapid pretreatment of Miscanthus using the low-cost ionic liquid triethylammonium hydrogen sulfate at elevated temperatures

et al. 2018

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“…A microwave extraction apparatus (XH-100B, XINGHU Microwave BEIJING, China) was chosen to improve the efficiency of lignin dissolution in ionic liquids [13,14]. The dissolving conditions were as follows: microwave power, 500 W; temperature, 80°C; reaction time, 30 min; and ratio of solid to liquid, 1:10.…”

Section: Solubility Test For Alkali Ligninmentioning

confidence: 99%

Preparation and structural characterization of lignin micro/nano-particles with ionic liquid treatment by self-assembly

Liu¹,

Li²,

Hou³

2018

Express Polym. Lett.

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Abstract. In the present research, 1,3-dimethyl-imidazolium dimethyl phosphate ([Mmim][DMP]) ionic liquid was applied to dissolve alkali lignin from wheat grass to prepare for lignin micro/nano-particles. The alkali lignin can be dissolved completely at 80°C in 30 min under microwave condition with [Mmim][DMP] (solid-liquid ratio of 1:10) which is easy to be recycled. The dissolved lignin can be precipitated by diluting the ionic liquid-lignin solution with water to get lignin micro/nano-particles with diameter ranged from 200 nm to 1.5 μm. Structural analyses with Gel permeation chromatography (GPC), 2D heteronuclear single quantum coherence nuclear magnetic resonance (2D-NMR), Thermogravimetric Analysis (TGA), etc., indicate that a large number of dehydration reactions occurred during dissolution process to result in the generation of unsaturated bonds with higher degree of unsaturation (Ω) (from 197-334), lower polydispersity (from 1.49 to 1.12) and lower average molecular weight (from 8634 to 5406 Da). Compared with original alkali lignin, the regenerated alkali lignin as micro/nano-particles showed higher thermal stability. It was also found from the 2D NMR spectra that the cleavages of aryl-ether bonds dramatically happened during the dissolution process, [Mmim][DMP] ionic liquid is more likely to destroy lignin units linked by β-O-4′ bonds to G-type lignin with less steric hindrance, resulting in the least amount of β-O-4′ linkages. In addition, dehydration and demethylation of lignin occurred during the dissolution of ionic liquid.

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“…Microwave irradiation was shown to enhance the dissolution of lignocellulosic materials in ionic liquids and subsequent fractionation of cellulose and lignin [60,61]. Microwave irradiation can facilitate the pretreatment of cellulose in ionic liquids [62].…”

Section: Microwave-assisted Chemical Pretreatmentmentioning

confidence: 99%

Microwave-assisted pretreatment technologies for the conversion of lignocellulosic biomass to sugars and ethanol: a review

Puligundla

Oh²,

Mok³

2016

Carbon letters

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Lignocellulosic biomass conversion to biofuels such as ethanol and other value-added bio-products including activated carbons has attracted much attention. The development of an efficient, cost-effective, and eco-friendly pretreatment process is a major challenge in lignocellulosic biomass to biofuel conversion. Although several modern pretreatment technologies have been introduced, few promising technologies have been reported. Microwave irradiation or microwave-assisted methods (physical and chemical) for pretreatment (disintegration) of biomass have been gaining popularity over the last few years owing to their high heating efficiency, lower energy requirements, and easy operation. Acid and alkali pretreatments assisted by microwave heating meanwhile have been widely used for different types of lignocellulosic biomass conversion. Additional advantages of microwave-based pretreatments include faster treatment time, selective processing, instantaneous control, and acceleration of the reaction rate. The present review provides insights into the current research and advantages of using microwave-assisted pretreatment technologies for the conversion of lignocellulosic biomass to fermentable sugars in the process of cellulosic ethanol production.

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Microwave-assisted dissolution and delignification of wood in 1-ethyl-3-methylimidazolium acetate

Cited by 52 publications

References 15 publications

Rapid pretreatment of Miscanthus using the low-cost ionic liquid triethylammonium hydrogen sulfate at elevated temperatures

Rapid pretreatment of Miscanthus using the low-cost ionic liquid triethylammonium hydrogen sulfate at elevated temperatures

Preparation and structural characterization of lignin micro/nano-particles with ionic liquid treatment by self-assembly

Microwave-assisted pretreatment technologies for the conversion of lignocellulosic biomass to sugars and ethanol: a review

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