Structural modification of pine and poplar wood by alkali pretreatment to improve ethanol production

Bay, Mohammad Saber; Karimi, Keikhosro; Esfahany, Mohsen Nasr; Kumar, Rajeev

doi:10.1016/j.indcrop.2020.112506

Cited by 39 publications

(10 citation statements)

References 43 publications

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“…In a previous study by Noori and Karimi [35], an increase in glucan content was observed after alkali treatment with the glucan content of pine increasing from 35% to 44% following treatment with alkali. An increase in the glucan content from 44% to 54% has also been observed in poplars after alkali treatment at 93 • C [36]. A reduction in mannose was observed after torrefaction at 225 • C, and complete removal was observed at higher torrefaction temperatures, similar to a previous report on the reduction in mannose at higher torrefaction temperatures [37].…”

Section: Sugar Composition Of Biomasssupporting

confidence: 87%

Synergistic Effects of Torrefaction and Alkaline Pretreatment on Sugar and Bioethanol Production from Wood Waste

Cahyanti,

Shanmugam,

Kikas

2023

Energies

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Abundant availability of lignocellulosic biomass (LCB) coupled with diverse pretreatment methods have made it a promising option for energy production. However, it faces several challenges, some of which can be overcome by integrating pretreatment processes. The present study aims to optimize the integration of two different pretreatment methods—torrefaction (to reduce moisture content and fractionate biomass) and alkaline pretreatment of wood waste (to delignify biomass)—and utilize it for bioethanol production. Pretreatment performance was evaluated based on delignification, biomass hydrolysis, and bioethanol production. Initially, torrefaction was performed in a continuous reactor at a temperature range of 225–300 °C, followed by optimization of the critical parameters of alkaline pretreatment of torrefied wood waste (TWW), that is, the temperature, reaction time, solid–liquid ratio, and alkali concentration. Subsequently, the chemical and carbohydrate compositions of raw wood waste (RWW) and TWW were studied, followed by enzymatic hydrolysis and bioethanol fermentation. Integrated pretreatment positively impacted the cellulose and glucose contents of raw and torrefied biomass at lower temperatures. The enzymatic hydrolysis of TWW treated with alkali produced higher levels of glucose and bioethanol than (stand-alone) TWW. These results can be used as a basis for choosing the most suitable pretreatment for enhanced biomass conversion.

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Section: Sugar Composition Of Biomasssupporting

confidence: 87%

Synergistic Effects of Torrefaction and Alkaline Pretreatment on Sugar and Bioethanol Production from Wood Waste

Cahyanti,

Shanmugam,

Kikas

2023

Energies

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“…The effect of this peak is small due to overlapping peaks of lignin and cellulose structure 17 . The peak intensity visible at 1755 cm −1 corresponds to the hemicellulose C─O stretching band indicating the presence of carbonyl and acetyl groups in untreated particles 27 . The prominent peaks at 1455, 1030, and 830 cm −1 in untreated particles correspond to the lignin compounds present in the particle.…”

Section: Resultsmentioning

confidence: 98%

Pinecone particles filled polybenzoxazine composites: Thermomechanical and mechanical properties

Nawaz

Wang

Gorar

et al. 2021

J of Applied Polymer Sci

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In the current study, 1 wt%, NaOH treated pine cone (ATPC) particles composites with bisphenol‐A aniline based benzoxazine (BA‐a) matrix were prepared by isothermal compression method. Ultimate impacts of ATPC reinforcement on the thermomechanical, tensile, flexural, and impact properties of the composites were studied by using a dynamic mechanical analyzer (DMA), a Universal testing machine, and a Tinius‐Olsen impact device, respectively. The thermal stability of ATPC particles was remarkably increased, TGA confirmed that particles will not be degraded during the curing. The DMA results of 30 wt% ATPC reinforced composites confirmed that the glass transition temperature, storage modulus, and loss modulus were 22°C, 2510, and 250 MPa higher than the neat matrix, respectively. In addition, the impact strength of the 30 wt% ATPC reinforced composites was nearly 3 times higher than the neat matrix, which confirmed that the matrix's brittleness is reduced, similar observation was confirmed by the Brostow and coworkers empirical model. Moreover, a gradual rise in the tensile and flexural properties was also recorded. We can easily conclude from the studied parameters that the ATPC particles can be used as a sustainable agro‐waste in polymeric composites.

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“…The decline in hydrolysis efficiency when using pine compared with the feedstock blend is likely due to a higher lignin content and a higher proportion of C–C linkages in pine . It is known that lignin is the most recalcitrant component of the plant cell wall; thus, the higher the proportion of lignin, the lower the bioavailability of the substrate. , …”

Section: Resultsmentioning

confidence: 99%

Deconstruction of Woody Biomass via Protic and Aprotic Ionic Liquid Pretreatment for Ethanol Production

Das

Achinivu

Barcelos

et al. 2021

ACS Sustainable Chem. Eng.

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Ionic liquids (ILs) have emerged as important solvents for conversion of lignocellulosic feedstocks to fuels and chemicals due to their ability to enable efficient biomass deconstruction and fractionation. Woody biomass derived from forest and agricultural residues has the potential to be used for production of biofuels and it's removal from forests can help mitigate disastrous wildfires in fire-prone states like California. This study evaluated woody biomass types (pine, almond, walnut, fir) from California as potential biofuel feedstocks. The feedstocks were pretreated with the ILs cholinium lysinate ([Ch][Lys]) and ethanolamine acetate ([EOA][OAc]), followed by enzymatic hydrolysis and fermentation of lignocellulosic sugars to produce ethanol.Under optimal conditions, [EOA][OAc] pretreatment and enzymatic hydrolysis generated glucose and xylose yields in the range of 24-82% and 14-80%, respectively, while glucose and xylose yield for the [Ch][Lys] ranged between 28-83% and 23-80%, respectively. Maximum fermentable sugar was released from almond wood and the lowest amount was from pine and fir.Blends of feedstocks were also explored and a blend with a mass ratio of 2/2/1 (almond:walnut:pine) resulted in maximum glucose and xylose (> 90%) yields using [Ch][Lys].Fermentation of this hydrolysate using a C5-utilizing strain of Saccharomyces cerevisiae resulted in a maximum ethanol concentration of 17.9 g/L for mixture biomass hydrolysate, corresponding to 60.8 % fermentation efficiency. This study represents the first demonstration of the use of these ILs for pretreatment of woody biomass blends that resulted in a high overall conversion efficiency for ethanol production.

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Structural modification of pine and poplar wood by alkali pretreatment to improve ethanol production

Cited by 39 publications

References 43 publications

Synergistic Effects of Torrefaction and Alkaline Pretreatment on Sugar and Bioethanol Production from Wood Waste

Synergistic Effects of Torrefaction and Alkaline Pretreatment on Sugar and Bioethanol Production from Wood Waste

Pinecone particles filled polybenzoxazine composites: Thermomechanical and mechanical properties

Deconstruction of Woody Biomass via Protic and Aprotic Ionic Liquid Pretreatment for Ethanol Production

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