New insights on structure of lignin‐carbohydrate complex from hot water pretreatment liquor

Feng, Nianjie; Ren, Litong; Wu, Hua; Wu, Qian; Xie, Yimin

doi:10.1016/j.carbpol.2019.115130

Cited by 39 publications

(17 citation statements)

References 28 publications

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“…Figure 1 shows the FTIR spectra of pretreated eucalyptus and raw eucalyptus chips. Stretching vibration in the spectra could be assigned to different groups of lignocellulose components: 1594, 1504 and 1273 cm −1 to lignin, 1421, 1319, 1229 and 1106 cm −1 to lignin and carbohydrates, and 3350, 2898, 1735, 1370, 1056 1026, and 892 cm −1 to carbohydrates [24,28,43,44]. The peaks at 1735 and 1229 cm −1 are related to the C=O stretching vibration and C-O stretching vibration in hemicellulose.…”

Section: Analysis Of Solid and Hydrolysate After Different Pretreatmentmentioning

confidence: 96%

Comparative Evaluation of Organic Acid Pretreatment of Eucalyptus for Kraft Dissolving Pulp Production

et al. 2020

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Pretreatment is an essential process for the extensive utilization of lignocellulose materials. The effect of four common organic acid pretreatments for Kraft dissolving pulp production was comparatively investigated. It was found that under acidic conditions, hemicellulose can be effectively removed and more reducing sugars can be recovered. During acetic acid pretreatment, lignin that was dissolved in acetic acid could form a lignin-related film which would alleviate cellulose hydrolysis, while other organic acids caused severe cellulose degradation. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffractometry (XRD) were used to characterize the pretreated chips in the process. Lignin droplets were attached to the surface of the treated wood chips according to the SEM results. The FTIR spectrum showed that the lignin peak signal becomes stronger, and the hemicellulose peak signal becomes weaker with acid pretreatment. The XRD spectrum demonstrated that the crystallinity index of the wood chips increased. The acetic acid pretreatment process-assisted Kraft process achieved higher yield (31.66%) and higher α-cellulose (98.28%) than any other organic acid pretreatment. Furthermore, extensive utilization of biomass was evaluated with the acetic acid pretreatment-assisted Kraft process. 43.8% polysaccharide (12.14% reducing sugar and 31.66% dissolving pulp) and 22.24% lignin (0.29% acetic acid lignin and 21.95% sulfate lignin) were recovered during the process. Biomass utilization could reach 66.04%. Acetic acid pretreatment is a promising process for extensive biomass utilization.

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Section: Analysis Of Solid and Hydrolysate After Different Pretreatmentmentioning

confidence: 96%

Comparative Evaluation of Organic Acid Pretreatment of Eucalyptus for Kraft Dissolving Pulp Production

et al. 2020

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“…The second stage, showing the decomposition of volatile substances (i.e., CO, CO 2, CH 4 , and b'-O-4' linkages due to the cleaving of the side chains) was observed at 150-380°C[23]. The maximum lignin degradation temperatures of the recovered lignin and commercial organosolv lignin were estimated to be 310°C and 334°C, respectively, which can indicate a potential relationship with the degradation of the b'-O-4' linkages[24]. The third stage was observed to be from 400 to 450 °C; the decomposition of the aromatic rings and the calving of the C-C linkages and 5-5' linkages of the lignin sample took place in this stage[25].…”

mentioning

confidence: 89%

Fractionation and characterization of lignin from sugarcane bagasse using a sulfuric acid catalyzed solvothermal process

Imman

Khongchamnan

Wanmolee

et al. 2020

Preprint

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Background: Conversion of lignocellulosic residue to bioenergy and biofuel is a promising platform for global sustainability. Fractionation is an initial step for isolating lignocellulosic components for subsequent valorization. The aim of this research is to develop the solvothermal fractionation of sugarcane bagasse to produce high purity lignin. Physio-chemical structure of isolated lignin from this process was determined.Results: In this study, a central composite design-based response surface methodology (RSM) was used to optimize an acid promoter for isolating lignin from sugarcane bagasse using a solvothermal fractionation process. The reaction was carried out with sulfuric acid, in the concentration of 0.01-0.02 M and a reaction temperature of 180-200°C for 30-90 min. The optimal conditions for the experiment were obtained at the acid concentration of 0.02 M with a temperature of 180ºC for 90 min in methyl isobutyl ketone (MIBK)/methanol/water (35%:25%:40% v/v%). The results showed that 87.1% of lignin recovery was conducted in the organic phase, while 88.0% of lignin removal was done in the solid phase. Furthermore, the change in the physico-chemical characteristics of solid residue and lignin recovery was recorded using various techniques. A GPC analysis of recovered lignin from the organic fraction showed a low average Mw/Mn (1374/785 g/mol) and lower polydispersity index (1.75) compared to commercial organosolv lignin. The maximum lignin degradation temperatures of recovered lignin and commercial organosolv lignin were estimated to be 310°C and 334°C, which can point to potential relationships with the degradation of β-O-4 cross-links. The results indicated that recovered lignin is mostly cross-linked by the β-O-4 cross-links.Conclusions: The development of sulfuric acid catalyzed solvothermal process in this study provides the efficient extraction of high-value organosolv lignin from sugarcane bagasse and the production of recovered lignin in organic phase with low contamination from other contents. The lignin characteristic data can contribute to the development of lignin valorization in value-added applications.

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“…Most previous studies have focused on LHW pretreatment at laboratory scale, and generated a substantial amount of laboratory data [22][23][24]. Implementation of industrial biorefinery processes entails an appropriate scaling-up procedure to achieve a successfully bioprocess design at industrial level, where a pilot plant is still a "must-have" step in the scalability of the process.…”

Section: Hydrothermal Pretreatment At Pilot Scalementioning

confidence: 99%

Liquid Hot Water Pretreatment of Lignocellulosic Biomass at Lab and Pilot Scale

Jimenez-Gutierrez

Verlinden²,

Meer³

et al. 2021

Processes

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Liquid hot water pretreatment is considered to be a promising method for increasing biomass digestibility due to the moderate operational conditions without chemical additions. A necessary step towards the scalability of this pretreatment process is performing pilot plant trials. Upscaling was evaluated with a scaling factor of 500, by using 50 mL in the laboratory and 25 L in a pilot plant batch reactor. Pretreatment times were varied from 30 to 240 min, and temperatures used were 180–188 °C, while applying similar heating profiles at both scales. The initial mass fraction of poplar wood chips ranged from 10% to 16%. Liquid hot water pretreatment at laboratory and pilot scale led to analogous results. The acetic acid analysis of the liquid and solid fractions obtained after pretreatment indicated that complete deacetylation of poplar biomass can be achieved.

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New insights on structure of lignin‐carbohydrate complex from hot water pretreatment liquor

Cited by 39 publications

References 28 publications

Comparative Evaluation of Organic Acid Pretreatment of Eucalyptus for Kraft Dissolving Pulp Production

Comparative Evaluation of Organic Acid Pretreatment of Eucalyptus for Kraft Dissolving Pulp Production

Fractionation and characterization of lignin from sugarcane bagasse using a sulfuric acid catalyzed solvothermal process

Liquid Hot Water Pretreatment of Lignocellulosic Biomass at Lab and Pilot Scale

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