Efficient hydrolysis of hemicellulose to furfural by novel superacid SO4H-functionalized ionic liquids

Hui, Wei; Zhou, Yan; Yan, Dong; Cao, Zhibo; He, Feiqiang; Cai, Min-Zhong; Tao, Duan‐Jian

doi:10.1016/j.gee.2018.06.002

Cited by 79 publications

(31 citation statements)

References 38 publications

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“…As a kind of promising green solvents, ionic liquids (ILs) consists of organic cation and inorganic or organic ions with low melting point (e.g., below 298 K) 5,6 . They have received much attention owing to their specific properties such as negligible nonvolatility, good thermal stabilities, high dissolvability, and a wide range of liquid temperatures 7,8 . Thus the unique properties of ILs provide new opportunities to capture CO 9‐11 .…”

Section: Introductionmentioning

confidence: 99%

Promoted absorption of CO at high temperature by cuprous‐based ternary deep eutectic solvents

Tao

et al. 2020

AIChE Journal

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Achieving efficient dissolution of carbon monoxide (CO) in the solvent is very helpful for the implementation of carbonylation reaction at ambient pressure. However, almost all of common solvents show very low solubilities of CO at high temperature. Herein, a series of cuprous‐based ternary deep eutectic solvent (DES) was prepared by mixing imidazolium hydrochloride with CuCl and ZnCl2. The ternary DES [BimH]Cl‐CuCl‐1.0ZnCl2 exhibited very large CO absorption capacity (0.075 mol mol−1, 1 bar) even at a high temperature (353.2 K), which is superior to all of the reported absorbents. Moreover, the ternary DES [BimH]Cl‐CuCl‐1.0ZnCl2 could further promote the reactive absorption of CO to conduct the aminocarbonylation reaction effortlessly at ambient pressure, and thus the targeted products benzamides were obtained in 70–97 yields. We believe that this finding opens a new way to design advanced solvents for efficient capture of CO at high temperature.

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Section: Introductionmentioning

confidence: 99%

Promoted absorption of CO at high temperature by cuprous‐based ternary deep eutectic solvents

Tao

et al. 2020

AIChE Journal

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“…Up to five cycles were performed to test the stability of the catalyst, resulting in a slight 5% decrease both in xylose conversion (reduced from 98 to 92%) and furfural yield (that dropped from 95 to 90%). The catalyst was also directly applied to xylan, with a reduction from 80 to 60% in the yield to furfural [71]. A third liquid-liquid catalytic system was designed to convert either xylose or wheat straw by the action of the Brønsted and Lewis acidity of chromium phosphate.…”

Section: Dehydration Of Xylose To Furfuralmentioning

confidence: 99%

Catalytic Processes from Biomass-Derived Hexoses and Pentoses: A Recent Literature Overview

2018

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Biomass is a plentiful renewable source of energy, food, feed and chemicals. It fixes about 1–2% of the solar energy received by the Earth through photosynthesis in both terrestrial and aquatic plants like macro- and microalgae. As fossil resources deplete, biomass appears a good complement and eventually a good substitute feedstock, but still needs the development of relatively new catalytic processes. For this purpose, catalytic transformations, whether alone or combined with thermal ones and separation operations, have been under study in recent years. Catalytic biorefineries are based on dehydration-hydrations, hydrogenations, oxidations, epimerizations, isomerizations, aldol condensations and other reactions to obtain a plethora of chemicals, including alcohols, ketones, furans and acids, as well as materials such as polycarbonates. Nevertheless, there is still a need for higher selectivity, stability, and regenerability of catalysts and of process intensification by a wise combination of operations, either in-series or combined (one-pot), to reach economic feasibility. Here we present a literature survey of the latest developments for obtaining value-added products using hexoses and pentoses derived from lignocellulosic material, as well as algae as a source of carbohydrates for subsequent transformations.

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“…The key shortcomings of above‐mentioned catalytic systems employed for the process are long residence times, high‐temperature conditions, involvement of high‐energy processes for distillation, and additional treatments such as neutralization causing large waste streams, decreased furfural yield, and selectivity. Recent literature also reports the use of various ionic liquids (ILs) as catalysts for various applications in energy‐effective processes, such as xylose and xylan hydrolysis [24] and fixation of CO 2 from industrial combustion into high‐value organic salts [25] . The use of acidic ILs has also been investigated as it is well known that the acidic strength of acid catalyst/IL plays a primary role in the degradation of hemicellulose [26–28] .…”

Section: Introductionmentioning

confidence: 99%

pH‐Controlled Efficient Conversion of Hemicellulose to Furfural Using Choline‐Based Deep Eutectic Solvents as Catalysts

2021

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The valorization of hemicellulose isolated from lignocellulosic biomass (wheat straw, rice husk, and bagasse) to furfural was achieved by pH‐controlled acid catalysis using choline‐based Brønsted acidic (BA) and natural acidic (NA) deep eutectic solvents (DES) serving both as catalyst and solvent. The effect of pH variation on the catalytic activity of various BADES and NADES prepared in 1 : 1 molar ratio was observed, and choline chloride/p‐toluene sulfonic acid (ChCl/p‐TSA) was found to be the best with lower pH value of 1.0. The yield of furfural decreased from 85 to 51 % with increase in pH from 1.0 to 3.0. The molar ratio of hydrogen bond donor to acceptor components was varied from 1 : 1 to 1 : 9 to achieve the lowest possible pH values of the DESs and to increase the furfural yield. Further optimization of reaction conditions was also done in terms of DES loading, time of reaction, and temperature using the model DES to achieve higher furfural yield. The best results were obtained using 5 mmol DES at pH 1.0 in 1.5 h at 120 °C. ChCl/p‐TSA and ChCl/oxalic acid among BADES and ChCl/levulinic acid among NADES investigated in this work yielding 85 % furfural were found to be most efficient. The reported methodology is advantageous in terms of using bio‐based green solvents, mild reaction conditions, and efficient scale‐up of the reaction. The DESs were found to be efficiently recyclable up to five consecutive runs for the process.

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Efficient hydrolysis of hemicellulose to furfural by novel superacid SO4H-functionalized ionic liquids

Cited by 79 publications

References 38 publications

Promoted absorption of CO at high temperature by cuprous‐based ternary deep eutectic solvents

Promoted absorption of CO at high temperature by cuprous‐based ternary deep eutectic solvents

Catalytic Processes from Biomass-Derived Hexoses and Pentoses: A Recent Literature Overview

pH‐Controlled Efficient Conversion of Hemicellulose to Furfural Using Choline‐Based Deep Eutectic Solvents as Catalysts

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