Recent advances in green solvents for lignocellulosic biomass pretreatment: Potential of choline chloride (ChCl) based solvents

Yiin, Chung Loong; Yap, Kok Liang; Ku, Andrian Zi En; Chin, Bridgid Lai Fui; Lock, Serene Sow Mun; Cheah, Kin Wai; Loy, Adrian Chun Minh; Chan, Yi Herng

doi:10.1016/j.biortech.2021.125195

Cited by 73 publications

(21 citation statements)

References 123 publications

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“…The reason are high costs for ILs due to synthesis, purification, and downstream processing procedures, which are currently the limiting factors for using ILs at a large scale [179]. Other disadvantages of ILs are poor biodegradability and biocompatibility, and usually, fossil resources are needed to produce ILs [184]. In 2007, Fukaya et al [185] developed so-called "Bio-ILs" completely derived from biomaterials to overcome these problems.…”

Section: Novel Extraction and Fractionation Methodsmentioning

confidence: 99%

“…In 2007, Fukaya et al [185] developed so-called "Bio-ILs" completely derived from biomaterials to overcome these problems. However, Yiin et al [184] concludes that further research has to be done on Bio-ILs, because studies are still limited in 2021. One of the drawbacks of all the treatment methods mentioned above is the heat transfer resistance limiting the process efficiency.…”

Section: Novel Extraction and Fractionation Methodsmentioning

confidence: 99%

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Removal of wood extractives as pulp (pre-)treatment: a technological review

2021

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Wood extractives usually do not exceed five percent of dry wood mass but can be a serious issue for pulping as well as for the pulp itself. They cause contamination and damages to process equipment and negatively influence pulp quality. This paper addresses not only the extractives-related problems but also different solutions for these issues. It is an extensive review of different technologies for removing wood extractives, starting with methods prior to pulping. Several wood yard operations like debarking, knot separation, and wood seasoning are known to significantly decreasing the amount of wood extractives. Biological treatment has also been proven as a feasible method for reducing the extractives content before pulping, but quite hard to handle. During pulping, the extractives reduction efficiency depends on the pulping method. Mechanical pulping removes the accessory compounds of wood just slightly, but chemical pulping, on the other hand, removes them to a large extent. Organosolv pulping even allows almost complete removal of wood extractives. The residual extractives content can be significantly reduced by pulp bleaching. Nevertheless, different extraction-based methods have been developed for removing wood extractives before pulping or bleaching. They range from organic-solvent-based extractions to novel processes like supercritical fluid extractions, ionic liquids extractions, microwave technology, and ultrasonic-assisted extraction. Although these methods deliver promising results and allow utilization of wood extractives in most cases, they suffer from many drawbacks towards an economically viable industrial-scale design, concluding that further research has to be done on these topics. Graphical abstract

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Section: Novel Extraction and Fractionation Methodsmentioning

confidence: 99%

Section: Novel Extraction and Fractionation Methodsmentioning

confidence: 99%

Removal of wood extractives as pulp (pre-)treatment: a technological review

2021

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“… Cat + : Any ammonium (NR 4 + ), phosphonium (PR 4 + ), or sulfonium cation (SR 3 + ) ( Yiin et al, 2021 ). X − : A Lewis base, generally a halide anion (F − , Cl − , Br − , I − , etc.).…”

Section: Deep Eutectic Solventsmentioning

confidence: 99%

“… Cat + : Any ammonium (NR 4 + ), phosphonium (PR 4 + ), or sulfonium cation (SR 3 + ) ( Yiin et al, 2021 ). …”

Section: Deep Eutectic Solventsmentioning

confidence: 99%

“…DES can deliver and accept protons, which enables the formation of hydrogen bonds with other compounds, thus enhancing their solubilization properties ( Pandey et al, 2017 ). Acidic DES (HBD: lactic, malic, and oxalic acids) are very effective in lignin solubilization ( Xu et al, 2016 ; Liu et al, 2017 ; Yiin et al, 2017 ; Liu et al, 2019 ; Ramesh et al, 2020 ; Yiin et al, 2021 ). One of the reasons why DES selectively dissolves lignin over cellulose is that both cellulose and DES have strong hydrogen bonding networks, solubilizing cellulose in DES requires dissociation and reorganization of both hydrogen-bonding networks to generate a thermodynamically more stable network.…”

Section: Deep Eutectic Solventsmentioning

confidence: 99%

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Recent Advances in the Catalytic Conversion of Biomass to Furfural in Deep Eutectic Solvents

Zhang

Zhu

et al. 2022

Front. Chem.

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Lignocellulose is recognized as an ideal raw material for biorefinery as it may be converted into biofuels and value-added products through a series of chemical routes. Furfural, a bio-based platform chemical generated from lignocellulosic biomass, has been identified as a very versatile alternative to fossil fuels. Deep eutectic solvents (DES) are new “green” solvents, which have been employed as green and cheap alternatives to traditional organic solvents and ionic liquids (ILs), with the advantages of low cost, low toxicity, and biodegradability, and also have been proven to be effective media for the synthesis of biomass-derived chemicals. This review summarizes the recent advances in the conversion of carbohydrates to furfural in DES solvent systems, which mainly focus on the effect of adding different catalysts to the DES system, including metal halides, water, solid acid catalyst, and certain oxides, on the production of furfural. Moreover, the challenges and perspectives of DES-assisted furfural synthesis in biorefinery systems are also discussed in this review.

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