Microwave-assisted Organosolv pretreatment of a sawmill mixed feedstock for bioethanol production in a wood biorefinery

Alio, Maarouf Abdou; Tugui, Oana-Cristina; Vial, Christophe; Pons, A.

doi:10.1016/j.biortech.2018.12.078

Cited by 50 publications

(23 citation statements)

References 28 publications

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“…When the pretreatment time was prolonged to 60 min, 45% of lignin was able to be recovered with 66% purity. A retention time of 60 min was reported to be necessary in order to obtain high delignification (≥80%) on organosolv pretreatment of mixed sawmill and beechwood [60,61]. A study by Alio et al, (2019) [60] showed that 57% of lignin was recovered from organosolv pretreatment sawdust mixture of softwood species using sulfuric acid as a catalyst for 60 min.…”

Section: Discussionmentioning

confidence: 99%

“…A retention time of 60 min was reported to be necessary in order to obtain high delignification (≥80%) on organosolv pretreatment of mixed sawmill and beechwood [60,61]. A study by Alio et al, (2019) [60] showed that 57% of lignin was recovered from organosolv pretreatment sawdust mixture of softwood species using sulfuric acid as a catalyst for 60 min. Furthermore, a retention time >60 min was needed in order to recover >30% of lignin during sulfuric acid-catalyzed organosolv pretreatment of OPEFB [59].…”

Section: Discussionmentioning

confidence: 99%

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Recovery of High Purity Lignin and Digestible Cellulose from Oil Palm Empty Fruit Bunch Using Low Acid-Catalyzed Organosolv Pretreatment

et al. 2020

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The lignocellulosic residue from the palm oil industry, oil palm empty fruit bunch (OPEFB), represents a challenge to both producing industries and environment due to its disposal difficulties. Alternatively, OPEFB can be used for the production of valuable products if pretreatment methods, which overcome OPEFB recalcitrance and allow tailored valorization of all its carbohydrates and lignin, are developed. Specifically, high-value applications for lignin, to increase its contribution to the feasibility of lignocellulosic biorefineries, demand high-purity fractions. In this study, acid-catalyzed organosolv using ethanol as a solvent was used for the recovery of high-purity lignin and digestible cellulose. Factors including catalyst type and its concentration, temperature, retention time, and solid-to-liquid (S/L) ratio were found to influence lignin purity and recovery. At the best conditions (0.07% H2SO4, 210 °C, 90 min, and S/L ratio of 1:10), a lignin purity and recovery of 70.6 ± 4.9% and 64.94 ± 1.09%, respectively, were obtained in addition to the glucan-rich fraction. The glucan-rich fraction showed 94.06 ± 4.71% digestibility within 18 h at an enzyme loading of 30 filter paper units (FPU) /g glucan. Therefore, ethanol organosolv can be used for fractionating OPEFB into three high-quality fractions (glucan, lignin, and hemicellulosic compounds) for further tailored biorefining using low acid concentrations. Especially, the use of ethanol opens the possibility for integration of 1st and 2nd generation ethanol benefiting from the separation of high-purity lignin.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Recovery of High Purity Lignin and Digestible Cellulose from Oil Palm Empty Fruit Bunch Using Low Acid-Catalyzed Organosolv Pretreatment

et al. 2020

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“…The optimal conditions determined experimentally on sawdust could be summarized as follows: an ethanol/water ratio of 60:40 with 0.25% H2SO4 for one-hour extraction at 175 • C. These conditions made it possible to remove 50% of the lignin while preserving 82% ± 3% of the initial cellulose with a purity of 71% ± 3% w/w. The composition of the pretreated sawdust mixture was then: 70.6% w/w cellulose, 9.8% w/w hemicellulose, and 19.6% w/w lignin, as determined by strong acid hydrolysis (Alio et al, 2019).…”

Section: Feedstocks and Reagentsmentioning

confidence: 99%

“…Prior to the preliminary assays of enzymatic hydrolysis, pretreated sawdust mixture was ovendried (110°C for 24h) for dosage purpose (Alio et al, 2019). Then, this was subjected to enzymatic hydrolysis, conducted at 1.5% (w/v) substrate loading, with an enzyme content of FPU/g of dry pretreated sawdust mixture for two different particle sizes.…”

Section: Effect Of Size Reduction On the Dried Substratementioning

confidence: 99%

“…In this work, the goal was, therefore, to hydrolyse and ferment an industrial and readily available sawmill feedstock previously pretreated through an "Organosolv pretreatment" based on an original microwave heating (Alio et al, 2019). This process presents the simultaneous advantage to produce high quality lignin that can be used in the closed-loop biorefinery concept with potentially high added-value coproducts.…”

Section: Introductionmentioning

confidence: 99%

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Hydrolysis and fermentation steps of a pretreated sawmill mixed feedstock for bioethanol production in a wood biorefinery

Alio

Tugui

Rusu

et al. 2020

Bioresource Technology

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The aim was to demonstrate the feasibility of second-generation bioethanol production using for the very first time a sawmill mixed feedstock comprising four softwood species, representative of biomass resource in Auvergne-Rhône-Alpes region (France). The feedstock was subjected to a microwave-assisted water/ethanol Organosolv pretreatment. The investigation focused on the enzymatic hydrolysis of this pretreated sawmill feedstock (PSF) using Cellic ® Ctec2 as the enzyme, followed by fermentation of the resulting sugar solution using Saccharomyces cerevisiae strain. The cellulose-rich PSF with 71% w/w cellulose content presented a high saccharification yield (up to 80%), which made it perfect for subsequent fermentation; this yield was predicted vs. time up to 5.2% w/v PSF loading using a mathematical model fitted only on data at 1.5%. Finally, high PSF loading (7.5%) and scaleup were shown to impair the saccharification yield, but alcoholic fermentation could still be carried out up to 80% of the theoretical glucose-to-ethanol conversion yield.

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Conversion of Lignocellulosic Biomass to Ethanol

Baskaran

Natarajan

Joy

et al. 2021

Biomolecular Engineering Solutions for Renewable Specialty Chemicals

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Microwave-assisted Organosolv pretreatment of a sawmill mixed feedstock for bioethanol production in a wood biorefinery

Cited by 50 publications

References 28 publications

Recovery of High Purity Lignin and Digestible Cellulose from Oil Palm Empty Fruit Bunch Using Low Acid-Catalyzed Organosolv Pretreatment

Recovery of High Purity Lignin and Digestible Cellulose from Oil Palm Empty Fruit Bunch Using Low Acid-Catalyzed Organosolv Pretreatment

Hydrolysis and fermentation steps of a pretreated sawmill mixed feedstock for bioethanol production in a wood biorefinery

Conversion of Lignocellulosic Biomass to Ethanol

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