Ionic Liquids: Green Solvent for Biomass Pretreatment

Ejaz, Uroosa; Sohail, Muhammad

doi:10.1007/978-3-030-44995-7_2

Cited by 9 publications

(4 citation statements)

References 52 publications

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“…Ionic liquids are often liquid at room temperature and possess unique properties which give them the potential ability to be used in various arena especially as green solvents [98]. Ionic liquids are selected as green solvents, a fascinating alternative for volatile organic solvents, because of their excellent physicochemical properties including nonflammability, negligible vapor pressure, non-volatility, solubility, and miscibility [99].…”

Section: Environmental Applications Of Ionic Liquid-based Antimicrobial Materialsmentioning

confidence: 99%

Ionic liquid-based antimicrobial materials for water treatment, air filtration, food packaging and anticorrosion coatings

Fallah

Zare

Khan

et al. 2021

Advances in Colloid and Interface Science

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Section: Environmental Applications Of Ionic Liquid-based Antimicrobial Materialsmentioning

confidence: 99%

Ionic liquid-based antimicrobial materials for water treatment, air filtration, food packaging and anticorrosion coatings

Fallah

Zare

Khan

et al. 2021

Advances in Colloid and Interface Science

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“…Recently, ionic-liquid (IL)-mediated lignin extraction has emerged as an environmentally benign technique for the selective fractionation of various types of biomass [ 8 ]. ILs are salts (with a melting point of <100 °C) that are liquid at ambient temperatures and comprise an organic cation and an organic/inorganic anion in their structures.…”

Section: Introductionmentioning

confidence: 99%

Efficient Lignin Fractionation from Scots Pine (Pinus sylvestris) Using Ammonium-Based Protic Ionic Liquid: Process Optimization and Characterization of Recovered Lignin

et al. 2022

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Lignin-based chemicals and biomaterials will be feasible alternatives to their fossil-fuel-based counterparts once their breakdown into constituents is economically viable. The existing commercial market for lignin remains limited due to its complex heterogenous structure and lack of extraction/depolymerization techniques. Hence, in the present study, a novel low-cost ammonium-based protic ionic liquid (PIL), 2-hydroxyethyl ammonium lactate [N11H(2OH)][LAC], is used for the selective fractionation and improved extraction of lignin from Scots pine (Pinus sylvestris) softwood biomass (PWB). The optimization of three process parameters, viz., the incubation time, temperature, and biomass:PIL (BM:PIL) ratio, was performed to determine the best pretreatment conditions for lignin extraction. Under the optimal pretreatment conditions (180 °C, 3 h, and 1:3 BM:PIL ratio), [N11H(2OH)][LAC] yielded 61% delignification with a lignin recovery of 56%; the cellulose content of the recovered pulp was approximately 45%. Further, the biochemical composition of the recovered lignin and pulp was determined and the recovered lignin was characterized using 1H–13C heteronuclear single quantum coherence (HSQC) nuclear magnetic resonance (NMR) spectroscopy, quantitative 31P NMR, gel permeation chromatography (GPC), attenuated total reflectance (ATF)–Fourier transform infrared spectroscopy (ATR-FTIR), and thermal gravimetric analysis (TGA) analysis. Our results reveal that [N11H(2OH)][LAC] is significantly involved in the cleavage of predominant β–O–4’ linkages for the generation of aromatic monomers followed by the in situ depolymerization of PWB lignin. The simultaneous extraction and depolymerization of PWB lignin favors the utilization of recalcitrant pine biomass as feedstock for biorefinery schemes.

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“…Hydrogen peroxide [9] and ionic liquids (ILs) are other solvents that have also been employed for pretreatment of biomass. In comparison to other solvents, ILs show valuable properties including non-combustibility, lower toxicity and low vapor pressure [10,11]. ILs convert crystalline components into amorphous forms that can easily be degraded because of the presence of more active sites.…”

Section: Introductionmentioning

confidence: 99%

Combined pretreatment of sugarcane bagasse using alkali and ionic liquid to increase hemicellulose content and xylanase production

et al. 2020

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Background Lignin in sugarcane bagasse (SB) hinders its utilization by microorganism, therefore, pretreatment methods are employed to make fermentable components accessible to the microbes. Multivariate analysis of different chemical pretreatment methods can aid to select the most appropriate strategy to valorize a particular biomass. Results Amongst methods tested, the pretreatment by using sodium hydroxide in combination with methyltrioctylammonium chloride, an ionic liquid, (NaOH+IL) was the most significant for xylanase production by Bacillus aestuarii UE25. Investigation of optimal levels of five significant variables by adopting Box-Behnken design (BBD) predicted 20 IU mL− 1 of xylanase and experimentally, a titer of 17.77 IU mL− 1 was obtained which indicated the validity of the model. The production kinetics showed that volumetric productivity of xylanase was much higher after 24 h (833.33 IU L− 1 h− 1) than after 48 h (567.08 IU L− 1 h− 1). The extracted xylan from SB induced more xylanase in the fermentation medium than pretreated SB or commercially purified xylan. Nuclear Magnetic Resonance, Fourier transform infrared spectroscopy and scanning electron microscopy of SB indicated removal of lignin and changes in the structure of SB after NaOH+IL pretreatment and fermentation. Conclusion Combined pretreatment of SB with alkali and methyltrioctylammonium chloride appeared better than other chemical methods for bacterial xylanase production and for the extraction of xylan form SB.

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Ionic Liquids: Green Solvent for Biomass Pretreatment

Cited by 9 publications

References 52 publications

Ionic liquid-based antimicrobial materials for water treatment, air filtration, food packaging and anticorrosion coatings

Ionic liquid-based antimicrobial materials for water treatment, air filtration, food packaging and anticorrosion coatings

Efficient Lignin Fractionation from Scots Pine (Pinus sylvestris) Using Ammonium-Based Protic Ionic Liquid: Process Optimization and Characterization of Recovered Lignin

Combined pretreatment of sugarcane bagasse using alkali and ionic liquid to increase hemicellulose content and xylanase production

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