A comparison of different pre-extraction methods followed by steam pretreatment of bamboo to improve the enzymatic digestibility and ethanol production

Yuan, Zhaoyang; Li, Guodong; Wei, Weiqi; Wang, Jiarun; Fang, Zhen

doi:10.1016/j.energy.2020.117156

Cited by 21 publications

(11 citation statements)

References 47 publications

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“…Notably, for all experiments, no significant loss of lignocellulose was observed in any of the pretreatments. Loss of hemicellulose acetyl groups is also likely to be minimal under these conditions . In general, extractive removal results in a higher lignocellulose content in the extracted feedstocks of 79, 77, 79, and 81% (i.e., g/100 g of extracted feedstock) for WA–RG, WA–WS, WA–BB, and WA–AS, respectively.…”

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

“…Biomass aqueous pre-extraction has been shown to retain silica and calcium and to only partially remove magnesium and iron, as observed also in this study. 48 − 50 Mild acetone organosolv treatment resulted in further solubilization of potassium, sodium, magnesium, and iron, while calcium (such as gypsum), aluminum, and silica accumulated in the pulp ash ( Figure S14 and Table S18 ).…”

Section: Results and Discussionmentioning

confidence: 99%

“…Pre-extraction removed most of the monovalent cations such as potassium and sodium, while removal of multivalent cations such as calcium, magnesium, and iron was significantly lower (Figures 3, S14, Tables S3 and S4), in line with the results reported for neutral aqueous extraction of bamboo. 48 Figure 3. Organic extractives (A), minerals (B), chloride (C), and lignocellulose content (D) of untreated and pre-extracted feedstocks expressed as g/100 g initial untreated feedstock (dry weight basis).…”

Section: T H Imentioning

confidence: 99%

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Biomass Pre-Extraction as a Versatile Strategy to Improve Biorefinery Feedstock Flexibility, Sugar Yields, and Lignin Purity

Smit

Zomeren

Dussan

et al. 2022

ACS Sustainable Chem. Eng.

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Feedstock flexibility is highly advantageous for the viability of (solvent-based) biorefineries but comes with the considerable challenge of having to cope with the varying nature and typically high abundance of nonlignocellulose compounds in the most readily available residual biomass streams. Here, we demonstrate that mild aqueous acetone organosolv fractionation of various complex lignocellulosic raw materials (roadside grass, wheat straw, birch branches, almond shells, and a mixed stream thereof) is indeed negatively affected by these compounds and present a versatile strategy to mitigate this bottleneck in biorefining. A biomass pre-extraction approach has been developed to remove the detrimental extractives with (aqueous) acetone prior to fractionation. Pre-extraction removed organic extractives as well as minerals, primarily reducing acid dose requirements for fractionation and loss of hemicellulose sugars by degradation and improved the purity of the isolated lignin. We show how pre-extraction affects the effectiveness of the biorefinery process, including detailed mass balances for pretreatment, downstream processing, and product characteristics, and how it affects solvent and energy use with a first conceptual process design. The integrated biorefining approach allows for the improved compatibility of biorefineries with sustainable feedstock supply chains, enhanced biomass valorization (i.e., isolation of bioactive compounds from the extract), and more effective biomass processing with limited variation in product quality.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: T H Imentioning

confidence: 99%

See 2 more Smart Citations

Biomass Pre-Extraction as a Versatile Strategy to Improve Biorefinery Feedstock Flexibility, Sugar Yields, and Lignin Purity

Smit

Zomeren

Dussan

et al. 2022

ACS Sustainable Chem. Eng.

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“…While acid, alkaline, or neutral pH pretreatments may be used, this work addresses liquid hot water (i.e., hydrothermal pretreatment at neutral pH). This represents one of the pretreatments that has been determined to be attractive since no chemicals are added or removed, and since high yields are obtained upon enzyme hydrolysis 2‐15 . Lignocellulosic materials are converted into ethanol for use in biofuels through a processing sequence that entails pretreatment, hydrolysis, fermentation to ethanol, and ethanol distillation and drying 9 .…”

Section: Introductionmentioning

confidence: 99%

Effect of using a nitrogen atmosphere on enzyme hydrolysis at high corn stover loadings in an agitated reactor

Santos

Ximenes

Thompson

et al. 2020

Biotechnology Progress

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A comprehensive review of the literature shows that enzyme hydrolysis efficiency decreases with increased solids loadings at constant enzyme:cellulose ratios for pretreated lignocellulosic substrates. In seeking a mechanistic explanation for this phenomenon, we found that a nitrogen atmosphere enhances enzyme hydrolysis and minimizes the decrease in glucose yields as solids loadings are increased in an agitated bioreactor. For liquid hot water pretreated corn stover, at solids loadings of both 100 and 200 g/L and hydrolyzed for 72 hr in a 1 L bioreactor at pH 5.0 with 3.6 mg protein per g biomass, glucose yields were 55% in a nitrogen atmosphere versus 45% in air with agitation and about 34% without agitation. While mixing promotes biomass/enzyme contact and disperses sugars released during hydrolysis that would otherwise cause product inhibition, nitrogen gas displaces air, avoiding deactivation of cellulases by oxygen. The nitrogen effect points to a facile approach of enhancing hydrolysis at high solids loadings.

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Sugar Production from Bamboo

Fatriasari¹,

Solihat²,

Sari³

et al. 2023

Multifaceted Bamboo

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A comparison of different pre-extraction methods followed by steam pretreatment of bamboo to improve the enzymatic digestibility and ethanol production

Cited by 21 publications

References 47 publications

Biomass Pre-Extraction as a Versatile Strategy to Improve Biorefinery Feedstock Flexibility, Sugar Yields, and Lignin Purity

Biomass Pre-Extraction as a Versatile Strategy to Improve Biorefinery Feedstock Flexibility, Sugar Yields, and Lignin Purity

Effect of using a nitrogen atmosphere on enzyme hydrolysis at high corn stover loadings in an agitated reactor

Sugar Production from Bamboo

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