Physicochemical characteristics of organosolv lignins from different lignocellulosic agricultural wastes

Pongchaiphol, Suchat; Suriyachai, Nopparat; Hararak, Bongkot; Raita, Marisa; Laosiripojana, Navadol; Champreda, Verawat

doi:10.1016/j.ijbiomac.2022.07.007

Cited by 20 publications

(12 citation statements)

References 79 publications

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“…43 The band intensity at 1710−1720 cm −1 , related to the unconjugated C�O stretching of carbonyl and carboxylic groups, increased with the increasing stabilization temperature. The increase in C�O observed in the stabilized PRW-lignin fibers agreed well with the FTIR data reported in the literature 46 and it was described due to the auto-oxidation reaction in the presence of oxygen-based radicals. 42,47 The absorption intensity ratio of C�O stretching at 1710−1720 cm −1 and vibration of aromatic skeleton C−C at 1590 cm −1 (I C�O /I C−C ), representing the degree of oxidation of each stabilization temperature, was calculated.…”

Section: ■ Results and Discussionsupporting

confidence: 90%

Fiber Melt Spinning and Thermo-Stabilization of Para-Rubber Wood Lignin: An Approach for Fully Biomass Precursor Preparation

Wannid,

Hararak,

Padee

et al. 2023

ACS Omega

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Para-rubber wood (PRW) lignin, extracted from agricultural waste, was successfully melt-spun to fibers and thermo-stabilized without employing auxiliary additives. 31P NMR analysis revealed that PRW-lignin contained mainly a syringyl unit of phenolic C5-substituted OH group, which enabled melt flow during fiber spinning, as well as a guaiacyl unit which offered the ability to cross-link during thermo-stabilization. Thermo-stabilized fibers with no fusion were achieved at 250 °C with the heating rate of 0.1 °C/min. Structural changes in the fibers during stabilization were systematically investigated using FTIR and XPS analyses. From the results, changes in the intensities of characteristic bands relating to C–H stretching, aromatic C–H stretching, and CO stretching indicated structural changes of lignin toward aromaticity via oxidation reactions. XPS analysis of the fibers carbonized at 900, 1000, and 1200 °C revealed an increase in carbon content from 72 to 87 wt %. and a decrease in oxygen content from 28 to 13 wt %. with the increasing carbonization temperature. The weight loss of carbonized fibers was in the range of 73.6 to 88.7%. The high weight loss of fibers carbonized at 1200 °C was explained partly due to the thermal decomposition of disordered carbon. The tensile strength and modulus of carbonized fibers were 163.0 and 275.1 MPa, respectively. This study demonstrates an approach to prepare a fully biomass precursor fiber and contributes to the exploration of the potential use of lignin from biomass waste.

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Section: ■ Results and Discussionsupporting

confidence: 90%

Fiber Melt Spinning and Thermo-Stabilization of Para-Rubber Wood Lignin: An Approach for Fully Biomass Precursor Preparation

Wannid,

Hararak,

Padee

et al. 2023

ACS Omega

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“…However, some (feedstock related) variation hampers correlation between treatments, and a more in depth study is needed for quantification, characterization, and isolation of LCC. Feedstock origin strongly determines the hydroxyl group content of the isolated organosolv lignins, 62 and indeed, a significant variation in aliphatic, phenolic, and carboxylic hydroxyl group content is observed, Figure 6D−F. However, specific feedstock shows similar trends with more aliphatic OH and less phenolic and carboxylic OH groups for the SCP lignins, as compared to the B and BR lignins.…”

Section: ■ Results and Discussionmentioning

confidence: 68%

Semicontinuous Aqueous Acetone Organosolv Fractionation of Lignocellulosic Biomass: Improved Biorefinery Processing and Output

Smit,

Hoek,

Bonouvrie

et al. 2024

ACS Sustainable Chem. Eng.

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Aqueous acetone organosolv fractionation of the lignocellulosic biomass using a batchwise operation is a robust technology option to produce cellulose, sugars, and lignin. Such fractionation is typically characterized by fast solubilization of most of the lignin and hemicellulose sugars in the early stages of the process, gradually followed by slower removal of the remaining, more recalcitrant part at later stages. As a result, most of the solubilized sugars and lignin experience a relatively long residence time in the hot liquor, leading to undesired sugar degradation and lignin depolymerization-condensation reactions. A lab-scale, semicontinuous countercurrent flow fractionation design is presented here as a solution to this issue and studied as an intermediate step toward an envisioned scaled-up design involving a series of percolation reactors coupled for liquid exchange. Counter-current semicontinuous processing (SCP) reduces the overall residence time of the solubilized sugars and lignin. While even slightly improving on fractionation performance, i.e., sugar and lignin solubilization, most importantly, SCP resulted in less sugar degradation and more hemicellulose oligomers compared to the simple batch process. SCP lignin proved to be of higher quality with increased β-O-4 content and, consequently, a higher abundance of lignin aliphatic hydroxyl groups, less formation of Hibbert ketones, and reduced condensation. The more native nature of the lignin is reflected in its improved reactivity in reductive partial depolymerization to lower molar mass and dispersity lignin building blocks. Overall, SCP thus provides a powerful and scalable strategy for improving the efficiency and effectiveness of aqueous acetone organosolv fractionation.

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“…Its residual char value is also higher than that of the lignin recovered by organic solvents. 38 This demonstrated that DES–SB lignin is an excellent matrix material, providing great potential for the development of novel composites and other biobased carbon materials.…”

Section: Resultsmentioning

confidence: 96%

“…The weight-average molecular weight ( M w ) and number-average molecular weight ( M n ) of the acetylated lignin were determined by GPC (Agilent 1260 II Gel Permeation Chromatograph). 37,38 Using a thermogravimetric analyzer, the temperature was increased from room temperature to 800 °C under a N 2 atmosphere at a ramp rate of 10 °C min −1 . 39 NMR analyses were performed to characterize the recovered lignin using a nuclear magnetic resonance spectrometer (Bruker Avance III HD500 NMR), and the detailed operating parameters of the NMR (HSQC and 31 PNMR) were consistent with previous reports.…”

Section: Methodsmentioning

confidence: 99%

A novel green biorefinery strategy for corn stover by pretreatment with weak alkali-assisted deep eutectic solvents

Wang,

Zhou,

Yin

et al. 2024

Green Chem.

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Physicochemical characteristics of organosolv lignins from different lignocellulosic agricultural wastes

Cited by 20 publications

References 79 publications

Fiber Melt Spinning and Thermo-Stabilization of Para-Rubber Wood Lignin: An Approach for Fully Biomass Precursor Preparation

Fiber Melt Spinning and Thermo-Stabilization of Para-Rubber Wood Lignin: An Approach for Fully Biomass Precursor Preparation

Semicontinuous Aqueous Acetone Organosolv Fractionation of Lignocellulosic Biomass: Improved Biorefinery Processing and Output

A novel green biorefinery strategy for corn stover by pretreatment with weak alkali-assisted deep eutectic solvents

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