The effect of different pre-treatments to improve delignification of eucalypt stumps in a biorefinery context

Gominho, Jorge; Costa, Ricardo A.; Lourenço, Ana; Neiva, Duarte; Pereira, Helena

doi:10.1016/j.biteb.2019.02.004

Cited by 15 publications

(11 citation statements)

References 34 publications

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“…The scattering angle (2θ) ranged from 10 • to 50 • with 0.02 increments. The crystallinity index (CrI) was calculated as the following Equation (1) [24]: CrI = (I 002 − I am )/I 002 × 100%…”

Section: X-ray Diffraction Methods (Xrd)mentioning

confidence: 99%

“…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%

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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: X-ray Diffraction Methods (Xrd)mentioning

confidence: 99%

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 S/G ratio was calculated using A1329/A1328 cm –1 , which represents the ratio of the S group and the G group in lignin. 24 CLL was calculated using A1508/A1600 cm –1 , which is related to the proportion of condensed lignin and the cross-linking structure. 25 Figure 4 A shows that CLL and S/G have a negative linear trend, that is, the larger the S/G, the smaller the CLL value.…”

Section: Resultsmentioning

confidence: 99%

Effect of Alkali and 1,4-Butanediol Contents on the Extraction of Lignin and Lignin-Based Activated Carbon

Hou

Wei

et al. 2021

ACS Omega

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In the process of lignin extraction by the organic solvent method, the amount of alkali and the content of 1,4-butanediol are important conditions that affect lignin yield. The effects of alkali and alcohol contents on lignin recovery, removal rate, and structure were studied. In this reaction system, the removal rate of lignin increased with the increase of alkali content but decreased with the increase of alcohol content. Fourier transform infrared (FT-IR) analysis showed that the phenol hydroxyl group and the ether bond in lignin had different trends in different alkali and 1,4-butanediol environments, and four different infrared parameters in lignin had an obvious linear relationship. Gel permeation chromatography (GPC) results showed that high alkali content and high 1,4-butanediol content could lead to the fragmentation of lignin. In addition, lignin extracted from alkali-quantity factor series was selected to prepare activated carbon, CaCl 2 was selected as the activator, and its effects were studied. Results showed that in the process of extracting lignin, on the one hand, NaOH content affects the functional groups of activated carbon by affecting the aromatic structure of lignin; on the other hand, the NaOH content affects the graphitization degree and specific surface area of activated carbon by affecting the removal rate and the molecular weight of lignin.

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“…The peaks near 1365 cm −1 (for flax and hemp) and 1373 cm −1 (for sisal) are characteristic of C-H bending in cellulose and hemicellulose [35,36,53,[55][56][57]. Oh et al [54] reported that a shift of this band to a higher wavenumber could be assigned to a less ordered cellulose structure.…”

Section: 2mentioning

confidence: 99%

Insight into the Effects of Solvent Treatment of Natural Fibers Prior to Structural Composite Casting: Chemical, Physical and Mechanical Evaluation

Abbass

Paiva

Oliveira

et al. 2021

Fibers

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This paper presents an optimized washing protocol for as-received natural fibers, prior to large-scale composite manufacturing, for the structural strengthening of historic masonry. The aim was to achieve a simple protocol for standard cleaning of fiber surfaces from low molecular weight constituents that may be detrimental towards interfacial strength without damaging the fibers. The proposed procedure employs the application of the solvent sequence: ethanol, acetone, hexane, with optimized incubation times and stirring conditions. Additionally, this procedure may change the surface of the fiber, thereby enhancing the durability of the fiber-matrix interface. The washing protocol resulted in an increase of tensile strength by 56%, 52% and 22% for flax, hemp and sisal fibers, respectively, as compared to the corresponding non-washed fibers, without loss of elongation. The static contact angle measurements confirmed exposure of a higher fraction of the hydrophilic crystalline cellulose, with a higher wettability observed after washing protocols.

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The effect of different pre-treatments to improve delignification of eucalypt stumps in a biorefinery context

Cited by 15 publications

References 34 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

Effect of Alkali and 1,4-Butanediol Contents on the Extraction of Lignin and Lignin-Based Activated Carbon

Insight into the Effects of Solvent Treatment of Natural Fibers Prior to Structural Composite Casting: Chemical, Physical and Mechanical Evaluation

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