Green solvents-based molecular weight controllable fractionation process for industrial alkali lignin at room temperature

Jin, Huiqi; Shi, Haiqiang; Jia, Wenchao; Sun, Yan; Sheng, Xueru; Guo, Yanzhu; Li, Haiming; Sun, Huiyu

doi:10.1016/j.ijbiomac.2022.03.049

Cited by 16 publications

(13 citation statements)

References 39 publications

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“…Several changes were observed with the addition of alkaline lignin. The bands at 1,650, 1,563, 1,328, and 836 cm −1 are typical lignin characteristic peaks ( Serrano et al, 2010 ; Wu et al, 2016 ; Jin et al, 2022 ). Further, the peak positions of some of the functional groups changed.…”

Section: Resultsmentioning

confidence: 99%

“…It achieves conversion of biomass for biofuel production, but the aqueous phase after pretreatment (mainly including lignin and a fraction of hemicellulose) still remains unused components and is considered waste. The conversion of alkaline lignin to various products (e.g., biochar and biochemicals) has been extensively studied ( Jin et al, 2022 ; Kim et al, 2022 ; Paul et al, 2022 ; Xiu et al, 2022 ), whereas the direct utilization of lignin-rich alkaline black liquor (BL) for valuable products has been seldomly reported.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enabling the complete valorization of hybrid Pennisetum: Directly using alkaline black liquor for preparing UV-shielding biodegradable films

Qian

Fan

Chen

et al. 2022

Front. Bioeng. Biotechnol.

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The conversion of lignocellulosic biomass into various high-value chemicals has been a rapid expanding research topic in industry and agriculture. Among them, alkaline removal and utilization of lignin are important for the accelerated degradation of biomass. Modern biorefinery has been focusing the vision on the advancement of economical, green, and environmentally friendly processes. Therefore, it is indispensable to develop cost-effective and simple biomass conversion technologies to obtain high-value products. In this study, the black liquor (BL) obtained from the alkaline pretreatment of biomass was added to polyvinyl alcohol (PVA) solution and used to prepare degradable ultraviolet (UV) shielding films, achieving direct and efficient utilization of the aqueous phase from alkaline pretreatment. This method avoids the extraction step of lignin fraction from black liquor, which can be directly utilized as the raw materials of films preparation. In addition, the direct use of alkaline BL results in films with similar UV-shielding properties, higher physical strength, and similar thermal stability compared with films made by commercial alkaline lignin. Therefore, this strategy is proposed for alkaline-pretreated biorefineries as a simple way to convert waste BL into valuable products and partially recover unconsumed sodium hydroxide to achieve as much integration of biomass and near zero-waste biorefineries as possible.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enabling the complete valorization of hybrid Pennisetum: Directly using alkaline black liquor for preparing UV-shielding biodegradable films

Qian

Fan

Chen

et al. 2022

Front. Bioeng. Biotechnol.

View full text Add to dashboard Cite

show abstract

“…Thus, the regression model cannot capture variations in solubility associated with molecular weight. However, many experimental studies have already investigated lignin fractionation procedures based on decreasing molecular weight heterogeneity, − so our approach complements these experimental investigations to instead reveal the interplay of solvent and lignin composition on lignin dissolution. Future work will investigate variations in molecular weight and how this influences predictions.…”

Section: Discussionmentioning

confidence: 99%

“…They achieved control over the molecular-weight distribution and functional group content. Jin and co-workers performed a five-step method, starting with ethanol–water and continuing with ethanol–GVL mixtures, with the former component increasing in ratio in each step for controlled solubility of industrial alkali lignin . Their process achieved a monotonic increase in the solubilized lignin molecular weight and a decrease in polydispersity and yield as they advanced through each step.…”

Section: Introductionmentioning

confidence: 99%

Heuristic Computational Model for Predicting Lignin Solubility in Tailored Organic Solvents

Sumer

Lehn

2022

ACS Sustainable Chem. Eng.

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Lignin is a random heteropolymer that has been extensively studied as a renewable source of aromatic precursors for high-value chemicals, biofuels, and bioplastics. A key challenge in lignin valorization is the structural and compositional heterogeneity of lignin feedstocks. Solvent-based approaches are commonly used to fractionate lignin to reduce this heterogeneity, but solvent selection can be challenging due to variability in lignin composition. In this work, we developed computational methods to predict good and poor organic solvents as a function of lignin composition. We analyzed 28 different linear pentamer structures, 18 from known libraries and 10 hypothetical polymers, and calculated their activity coefficients in 50 different organic solvents by using the conductor-like screening model for realistic solvents. We used these data to train a regression model that enabled the extensive investigation of the impact of solvent and monolignol compositions on predicted lignin solubility. The exhaustive exploration of solubility trends using model predictions revealed sets of solvents, identified using Kamlet−Taft parameters, that are predicted to promote lignin dissolution regardless of lignin composition. We further identified solvents expected to selectively isolate lignin fractions enriched in certain subunits. These results establish heuristic guidelines for solvent selection that can be used to tailor fractionation processes for lignin feedstocks of distinct composition or to design new processes that isolate fractions with higher proportions of selected subunits.

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“…Lignin, the most abundant natural bioresources of aromatic compounds, has shown great potential in bio-jet fuels and compound material preparation (Jin et al, 2022). The changes in structural features during extraction directly affect its application and upgrade conversion.…”

Section: Introductionmentioning

confidence: 99%

One-Step Acid Bleachable Pretreatment with a Recyclable Acid Hydrotrope and Chlorate for Biomass Valorization

Zhang

2022

Bioenerg. Res.

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Pretreatment is a necessary step to converting lignocellulosic biomass from its native form into a more accessible form for the value-added utilization of its main components. Herein, we developed a one-step acid bleachable pretreatment method using a recyclable acid hydrotrope (p-toluenesulfonic acid, p-TsOH) and chlorate to achieve the bers bleaching and lignin extraction simultaneously. Under a mild condition (C80T80t45), 84.33% of hemicellulose and 76.79% of lignin were dissolved out. The obtained dispersed bers with a high whiteness of 60.13% ISO can be used for papermaking or ethanol production. The results from quasi-simultaneous enzymatic sacchari cation and combined fermentation (Q-SSF) of the pretreated substrate indicated that the ethanol concentration and yield reached to 39.30 ± 0.57 g/L and 82.36 ± 1.15%, respectively. What's more, according to the results of lignin characterization, the aromatic rings in extracted lignin were opened forming dicarboxylic acids as well as derivatives due to the oxidation of chlorate, which is bene cial for its catalytic upgrading and composites preparation.Therefore, this study is important to valorization of lignocellulosic biomass.

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Green solvents-based molecular weight controllable fractionation process for industrial alkali lignin at room temperature

Cited by 16 publications

References 39 publications

Enabling the complete valorization of hybrid Pennisetum: Directly using alkaline black liquor for preparing UV-shielding biodegradable films

Enabling the complete valorization of hybrid Pennisetum: Directly using alkaline black liquor for preparing UV-shielding biodegradable films

Heuristic Computational Model for Predicting Lignin Solubility in Tailored Organic Solvents

One-Step Acid Bleachable Pretreatment with a Recyclable Acid Hydrotrope and Chlorate for Biomass Valorization

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