Alkaline sulfonation and thermomechanical pulping pretreatment of softwood chips and pellets to enhance enzymatic hydrolysis

Wu, Jie; Chandra, Richard P.; Takada, Masatsugu; Río, Pablo G. del; Kim, Kwang Ho; Kim, Chang Soo; Liu, Liyang; Renneckar, Scott; Saddler, Jack N.

doi:10.1016/j.biortech.2020.123789

Cited by 26 publications

(11 citation statements)

References 34 publications

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“…Nonetheless, autohydrolyzed corn stover at 200 • C obtained a GGC at 72 h of 65.5%, which reflects lower and less significant susceptibility to enzyme attack, probably due to the higher retention of hemicelluloses in the solid fraction that hinders easy access to the cellulose [45,46] and to the distribution of cellulose, most likely in the form of crystalline and long fibers instead of short and amorphous structures [47]. These values can be positively compared to those obtained by Dávila et al (2019) after saccharification of autohydrolyzed vine shoot at a S 0 = 4.01, with a cellulose-to-glucose conversion of 49% [46].…”

Section: Glucose Concentration (G/l)mentioning

confidence: 99%

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A Whole-Slurry Fermentation Approach to High-Solid Loading for Bioethanol Production from Corn Stover

Río¹,

Gullón²,

Rebelo³

et al. 2020

Agronomy

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Corn stover is the most produced byproduct from maize worldwide. Since it is generated as a residue from maize harvesting, it is an inexpensive and interesting crop residue to be used as a feedstock. An ecologically friendly pretreatment such as autohydrolysis was selected for the manufacture of second-generation bioethanol from corn stover via whole-slurry fermentation at high-solid loadings. Temperatures from 200 to 240 °C were set for the autohydrolysis process, and the solid and liquid phases were analyzed. Additionally, the enzymatic susceptibility of the solid phases was assessed to test the suitability of the pretreatment. Afterward, the production of bioethanol from autohydrolyzed corn stover was carried out, mixing the solid with different percentages of the autohydrolysis liquor (25%, 50%, 75%, and 100%) and water (0% of liquor), from a total whole slurry fermentation (saving energy and water in the liquid–solid separation and subsequent washing of the solid phase) to employing water as only liquid medium. In spite of the challenging scenario of using the liquor fraction as liquid phase in the fermentation, values between 32.2 and 41.9 g ethanol/L and ethanol conversions up to 80% were achieved. This work exhibits the feasibility of corn stover for the production of bioethanol via a whole-slurry fermentation process.

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Section: Glucose Concentration (G/l)mentioning

confidence: 99%

“…Nonetheless, autohydrolyzed corn stover at 200 °C obtained a GGC at 72 h of 65.5%, which reflects lower and less significant susceptibility to enzyme attack, probably due to the higher retention of hemicelluloses in the solid fraction that hinders easy access to the cellulose [45,46] and to…”

Section: Figurementioning

confidence: 99%

A Whole-Slurry Fermentation Approach to High-Solid Loading for Bioethanol Production from Corn Stover

Río¹,

Gullón²,

Rebelo³

et al. 2020

Agronomy

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“…34 − groups, respectively. 14,37 2D-HSQC NMR characterization results apparently demonstrated the sulfonic groups with multiple aliphatic chains had been successfully introduced into lignin after microwave-assisted sulfonation, and the substructures of lignin and sulfonated lignin samples are shown in Figure 4. The results suggested that the reaction mainly occurred at the aliphatic α−OH groups on the side chain of lignin if formaldehyde and sodium bisulfite were applied, which was mainly due to the lignin used in the present study mainly consisting of S-type lignin, therefore the main reaction during the preparation was Tollen's reaction with the sulfonation reaction that occurred at the aliphatic α-OH groups of lignin.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

Microwave-Assisted Sulfonation of Lignin for the Fabrication of a High-Performance Dye Dispersant

Xiao

Jiang

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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Designing a valorization approach of lignin is essential to achieve "lignin-first" biorefining, which enables the economic feasibility of the lignocellulosic biorefinery industry. Herein, microwave-assisted sulfonation of lignin was investigated with multiple chemicals for the production of a lignin-based dye dispersant, and the effect of the aliphatic chain of sulfonation reagents on the dispersive performance of the sulfonated lignin was revealed. Structural characterization recommended that 1,4butanesultone exhibited the best reaction activity, and its sulfonation product (SL4) exhibited the highest molecular weight (7190 Da) and sulfonic group content (1.59 mmol•g −1 ) among all samples, because of its long aliphatic chain. The high content of sulfonic group and the high molecular weight of SL4 improved the dispersive performance with excellent high temperature stability in which the dyeing rate was 87.9%. The fiber staining effect evaluation of sulfonated lignin dispersants demonstrated that the etherification by 1,4-butanesultone could reduce the phenolic hydroxyl content of lignin to prevent the adsorption of the dispersant on fiber, limiting the fiber staining by sulfonated lignin during the dyeing process. This highly efficient lignin sulfonation can facilitate the valorization of lignin by fabricating the lignin-based dye dispersant for widespread industrial applications.

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“…In this sense, the production of ethanol from LCM implies three main steps: (i) pretreatment of the raw material pretreatment, (ii) enzymatic saccharification to transform the cellulose into glucose, and (iii) biological conversion of glucose to ethanol via fermentation the two latter processes can be carried out at the same time through simultaneous saccharification and fermentation (SSF). The selection of a suitable pretreatment is required to enhance the enzymatic saccharification of cellulose, since factors related to LCM structure (such as cellulose crystallinity, moisture content, available surface area, degree of polymerization and lignin content) hinder the enzymes' action [24,25]. Furthermore, the high cost associated with biomass pretreatment still represents a significant drawback for the biorefinery development.…”

Section: Introductionmentioning

confidence: 99%

Alternative Lime Pretreatment of Corn Stover for Second-Generation Bioethanol Production

et al. 2021

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In this work, a delignification process, using lime (Ca(OH)2) as an alternative alkali, was evaluated to improve enzymatic saccharification of corn stover cellulose, with the final goal of obtaining second-generation bioethanol. For that, an experimental design was conducted in order to assay the effect of temperature, lime loading, and time on the corn stover fractionation and enzymatic susceptibility of cellulose. Under conditions evaluated, lime pretreatment was selective for the recovery of cellulose (average of 91%) and xylan (average of 75.3%) in the solid phase. In addition, operating in mild conditions, a delignification up to 40% was also attained. On the other hand, a maximal cellulose-to-glucose conversion (CGCMAX) of 89.5% was achieved using the solid, resulting from the treatment carried out at 90 °C for 5 h and lime loading of 0.4 g of Ca(OH)2/g of corn stover. Finally, under selected conditions of pretreatment, 28.7 g/L (or 3.6% v/v) of bioethanol was produced (corresponding to 72.4% of ethanol conversion) by simultaneous saccharification and fermentation. Hence, the process, based on an alternative alkali proposed in this work, allowed the successful production of biofuel from the important and abundant agro-industrial residue of corn stover.

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Alkaline sulfonation and thermomechanical pulping pretreatment of softwood chips and pellets to enhance enzymatic hydrolysis

Cited by 26 publications

References 34 publications

A Whole-Slurry Fermentation Approach to High-Solid Loading for Bioethanol Production from Corn Stover

A Whole-Slurry Fermentation Approach to High-Solid Loading for Bioethanol Production from Corn Stover

Microwave-Assisted Sulfonation of Lignin for the Fabrication of a High-Performance Dye Dispersant

Alternative Lime Pretreatment of Corn Stover for Second-Generation Bioethanol Production

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