Key process parameters for deep eutectic solvents pretreatment of lignocellulosic biomass materials: A review

Xu, Huanfei; Peng, Jianjun; Kong, Yi; Liu, Yaoze; Su, Zhenning; Li, Bin; Song, Xiaoming; Liu, Shiwei; Tian, Wende

doi:10.1016/j.biortech.2020.123416

Cited by 197 publications

(70 citation statements)

References 108 publications

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“…Hence, DESs would play an important role in pretreatment techniques of straw biomass, which are proposed as the most promising and environmentally friendly alternatives to traditional solvents for elevating straw biomass conversion. There are plenty of process parameters that could affect the efficiency of DES treatment, for example, 1) properties of lignocellulosic feedstocks including component, crystallinity, and particle size, 2) characteristics of DESs such as the HBD and HBA properties and the molar ratio of HBD and HBA, and 3) reaction conditions of treatment including the effect of the ratio of the solid to the liquid, temperature, and time of DES treatment ( Xu et al, 2020 ; Yoo et al, 2020 ). Hence, they are of great significance for the development of lignocellulose feedstock conversion, fractionation, saccharification, and fermentation to further research the DES characteristics and reaction conditions.…”

Section: Deep Eutectic Solventsmentioning

confidence: 99%

“…Hence, they are of great significance for the development of lignocellulose feedstock conversion, fractionation, saccharification, and fermentation to further research the DES characteristics and reaction conditions. Although many previous studies had reported on DES treatment from various aspects, the exact mechanism of DES interaction with lignocellulose feedstocks still has not been demonstrated ( Xu et al, 2020 ).…”

Section: Deep Eutectic Solventsmentioning

confidence: 99%

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Advances in Pretreatment of Straw Biomass for Sugar Production

Tan

et al. 2021

Front. Chem.

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Straw biomass is an inexpensive, sustainable, and abundant renewable feedstock for the production of valuable chemicals and biofuels, which can surmount the main drawbacks such as greenhouse gas emission and environmental pollution, aroused from the consumption of fossil fuels. It is rich in organic content but is not sufficient for extensive applications because of its natural recalcitrance. Therefore, suitable pretreatment is a prerequisite for the efficient production of fermentable sugars by enzymatic hydrolysis. Here, we provide an overview of various pretreatment methods to effectively separate the major components such as hemicellulose, cellulose, and lignin and enhance the accessibility and susceptibility of every single component. This review outlines the diverse approaches (e.g., chemical, physical, biological, and combined treatments) for the excellent conversion of straw biomass to fermentable sugars, summarizes the benefits and drawbacks of each pretreatment method, and proposes some investigation prospects for the future pretreatments.

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Section: Deep Eutectic Solventsmentioning

confidence: 99%

Section: Deep Eutectic Solventsmentioning

confidence: 99%

Advances in Pretreatment of Straw Biomass for Sugar Production

Tan

et al. 2021

Front. Chem.

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“…[ 11,12 ] Conventional pretreatment methods are classified into biological (e.g., fungal and bacterial pretreatment), physical (e.g., milling, ultrasonic, microwave, mechanical extrusion); chemical (e.g., acid hydrolysis, alkaline hydrolysis, organosolv, oxidation delignification, ozonolysis), physicochemical pre‐treatment (e.g., steam explosion, ammonia fiber explosion) methods. [ 11–14 ] Emerging technologies are developed based on the use of ionic liquids (ILs), [ 15 ] deep eutectic solvents (DES), [ 16 ] microwave‐assisted methods, [ 17 ] sub/supercritical fluids (SCFs), [ 18,19 ] aiming at enhancing the recyclability of solvents/reagents of pretreatment processes. [ 15,20–22 ] These advanced solvents are recyclable and have high selectivity for removing noncellulosic fractions of the LC biomass.…”

Section: Introductionmentioning

confidence: 99%

“…[ 23 ] DES are versatile for sustainable biorefinery applications and some are evaluated to be readily biodegradable. [ 16,24–27 ] On the other hand, DES and ILs are expensive and some of them are toxic, requiring the use of ammonium salt, urea, and choline chloride. [ 16,24–27 ] Processing of LCB in ILs and DES solvents requires solvent recovery as well as thorough washing of the pretreated solid for further hydrolysis reaction.…”

Section: Introductionmentioning

confidence: 99%

Conversion of Lignocellulosic Biomass to Reducing Sugars in High Pressure and Supercritical Fluids: Greener Alternative for Biorefining of Renewables

Kumar

Kermanshahi-pour

Brar

et al. 2021

Advanced Sustainable Systems

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Supercritical fluids offer great potential to be employed in lignocellulosic biomass (LCB) fractionation in biorefinery. Supercritical carbon dioxide and water are greener alternatives compared with conventional reagents and have been investigated for the pretreatment and hydrolysis of lignocellulosic biomass. This review is focused on examining the fundamentals that govern the function of supercritical fluids in the pretreatment stage, as well as in the main hydrolysis reaction. Sub/supercritical carbon dioxide is used in pretreatment and sub/supercritical water has been the solvent of choice in hydrolysis of LCB. Significant research has gone into understanding the effect of process parameters such as temperature, pressure, cosolvent, and use of external catalyst on the sugar yield in biorefining of the LCB in supercritical fluids. It is shown that processes with reduced environmental impact and energy consumption can significantly enhance biorefining of LCB at commercial scale. Enzymatic hydrolysis of LCB in supercritical carbon dioxide is a promising approach that can accommodate mild reaction conditions. Developing an understanding of the performance of enzymes in high pressure systems and designing carriers for enzyme immobilization and further recycling is expected to enable one pot pretreatment and hydrolysis and is an important milestone in processing renewable resources for deriving biofuel and value‐added chemicals.

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“…The recent discovery and development of deep eutectic solvent (DES) as an effectively solvent for the lignin extraction provided a new insight through this field [ 14 ]. The related DES was first, induced by Abbott [ 15 ] as a sustainable, biodegradable and designable solvent with great potential for varies applications [ 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Lignin Extraction of Poplar by Treatment of Deep Eutectic Solvent with Low Halogen Content

Liu

Yang

et al. 2020

Polymers

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A novel choline-based deep eutectic solvent (DES) with low halogen content—namely choline lactate-lactic acid (CLL)—was synthesized by replacing the chloride anion with lactate anion in choline chloride-lactic acid (CCL). CLL and CCL treatments were conducted at 140 °C for 12 h with hydrogen bond acceptor/hydrogen bond donor =1/10, thereafter composition analysis and characterizations of the lignin extracted by DES treatment (DES lignin) and the solid residue were carried out. The proposed low halogen content DES presented an improved lignin extraction efficiency. The CLL treatment extracted 90.13% of initial lignin from poplar, while CCL extracted 86.02%. In addition, the CLL treatment also provided DES lignin with an improved purity (91.17%), lower molecular weight (Mw/Mn=1805/971 g/mol) and more concentrated distribution (polydispersity index=1.86). The efficient lignin extraction was mainly ascribed to the cleavage of β-O-4 bonds in lignin macromolecule, especially in the guaiacyl units, thereby breaking them into smaller molecules, facilitating the lignin extraction. The replacement of chloride anion allowed CLL acting as a more efficient DES to interact with lignin macromolecules, thus providing lignin with higher uniformity and suitable molecular weight. The low halogen content DES system proposed in present work could benefit the fractionation of biomass, improve the valorization of lignin compounds and facilitate industrial process in the downstream.

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Key process parameters for deep eutectic solvents pretreatment of lignocellulosic biomass materials: A review

Cited by 197 publications

References 108 publications

Advances in Pretreatment of Straw Biomass for Sugar Production

Advances in Pretreatment of Straw Biomass for Sugar Production

Conversion of Lignocellulosic Biomass to Reducing Sugars in High Pressure and Supercritical Fluids: Greener Alternative for Biorefining of Renewables

Enhancement of Lignin Extraction of Poplar by Treatment of Deep Eutectic Solvent with Low Halogen Content

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