Low temperature ionic liquid pretreatment of lignocellulosic biomass to enhance bioethanol yield

Alayoubi, Ranim; Mehmood, Nasir; Husson, Éric; Kouzayha, Achraf; Tabcheh, Mohamad; Chaveriat, Ludovic; Sarazin, Catherine; Gosselin, Isabelle

doi:10.1016/j.renene.2019.07.091

Cited by 125 publications

(48 citation statements)

References 53 publications

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“…However, an increase in the temperature or duration of IL-pretreatment allow to achieve higher sugar yields usually implemented at temperature between 80°C and 160°C from hours to overnight regardless of biomass (Olivier-Bourbigou et al, 2010; Brandt et al, 2013; Badgujar and Bhanage, 2015; Liang et al, in press). Another point that can be connected is the biomass loading, especially with pretreatment with pure IL due to high viscosity (Alayoubi et al, 2019). These studies led us to the choice of experimental range gathered in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Wheat Bran Pretreatment by Room Temperature Ionic Liquid-Water Mixture: Optimization of Process Conditions by PLS-Surface Response Design

et al. 2019

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Room Temperature Ionic Liquids (RTILs) pretreatment are well-recognized to improve the enzymatic production of platform molecules such as sugar monomers from lignocellulosic biomass (LCB). The conditions for implementing this key step requires henceforth optimization to reach a satisfactory compromise between energy saving, required RTIL amount and hydrolysis yields. Wheat bran (WB) and destarched wheat bran (DWB), which constitute relevant sugar-rich feedstocks were selected for this present study. Pretreatments of these two distinct biomasses with various 1-ethyl-3-methylimidazolium acetate ([C2mim][OAc])-water mixtures prior to hydrolysis catalyzed by hemicellulolytic cocktail (Cellic CTec2) were finely investigated. The main operating conditions such as pretreatment temperature (25–150°C), time (40–180 min), WB and DWB loading (2–5% w/v) and concentration of [C2mim][OAc] in water [10–100% (v/v)] were screened through glucose and xylose yields and then optimized through a Partial Least Square (PLS)—Second Order Design. In an innovative way, the PLS results showed that the four factors and their interactions could be well-fitted by a second-order model ( p < 0.05). The quadratic PLS models were used to predict optimal pretreatment conditions. Thus, maximum glucose (83%) and xylose (95%) yields were obtained from enzymatic hydrolysis of WB pretreated at 150°C for 40 min with 10% of [C2mim][OAc] in water and 5% of WB loading. For DWB, maximum glucose (100%) and xylose (57%) yields were achieved for pretreatment temperatures of 150°C and 25°C, respectively. The required duration was still 40 min, with 20% of [C2mim][OAc] in water and a 5% DWB loading. Then, Multiple Response Optimization (MRO) performed by Nelder-Mead Simplex Method displayed sugar yields similar to those obtained by individual PLS optimization. This complete statistical study confirmed that the established models were appropriate to predict the sugar yields achieved after different pretreatment conditions from WB and DWB biomasses. Finally, Scanning Electron microscopy (SEM) studies allowed us to establish clearer link between structural changes induced by pretreatment and the best enzymatic performances obtained.

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Section: Resultsmentioning

confidence: 99%

Wheat Bran Pretreatment by Room Temperature Ionic Liquid-Water Mixture: Optimization of Process Conditions by PLS-Surface Response Design

et al. 2019

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“…A particular interesting group of chemicals is the ionic liquids . Ionic liquids are salts that consist of an inorganic anion and an organic cation [121–123]. The cations are typically composed of organic cores, e.g.…”

Section: Pretreatment Methodsmentioning

confidence: 99%

“…ILs have been used to pretreat various lignocellulosic materials. Alayoubi et al [121] used [Emim][OAc] to pretreat three cellulose-containing materials: cotton, spruce and oak sawdust. In addition, they performed enzymatic hydrolysis of the untreated and pretreated materials.…”

Section: Pretreatment Methodsmentioning

confidence: 99%

Pretreatment for biorefineries: a review of common methods for efficient utilisation of lignocellulosic materials

Galbe

Wallberg

2019

Biotechnol Biofuels

333

195

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The implementation of biorefineries based on lignocellulosic materials as an alternative to fossil-based refineries calls for efficient methods for fractionation and recovery of the products. The focus for the biorefinery concept for utilisation of biomass has shifted, from design of more or less energy-driven biorefineries, to much more versatile facilities where chemicals and energy carriers can be produced. The sugar-based biorefinery platform requires pretreatment of lignocellulosic materials, which can be very recalcitrant, to improve further processing through enzymatic hydrolysis, and for other downstream unit operations. This review summarises the development in the field of pretreatment (and to some extent, of fractionation) of various lignocellulosic materials. The number of publications indicates that biomass pretreatment plays a very important role for the biorefinery concept to be realised in full scale. The traditional pretreatment methods, for example, steam pretreatment (explosion), organosolv and hydrothermal treatment are covered in the review. In addition, the rapidly increasing interest for chemical treatment employing ionic liquids and deep-eutectic solvents are discussed and reviewed. It can be concluded that the huge variation of lignocellulosic materials makes it difficult to find a general process design for a biorefinery. Therefore, it is difficult to define "the best pretreatment" method. In the end, this depends on the proposed application, and any recommendation of a suitable pretreatment method must be based on a thorough techno-economic evaluation.

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“…Pretreatments of lignocellulosic biomass to produce ethanol are usually conducted at temperatures between 80 and 160°C raising realistically an energy demand problem. Alayoubi et al (2019) studied an eco-friendly pretreatment strategy using the 1-ethyl-3-methylimidazolium acetate [Emim][OAc] IL at 45°C. This energy-efficient method accomplishes the same result of high energy demanded pretreatments.…”

Section: Annual Literature Reviewmentioning

confidence: 99%

Bioenergy from biofuel residues and waste

Sheehan

Murray

et al. 2020

Water Environment Research

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Low temperature ionic liquid pretreatment of lignocellulosic biomass to enhance bioethanol yield

Cited by 125 publications

References 53 publications

Wheat Bran Pretreatment by Room Temperature Ionic Liquid-Water Mixture: Optimization of Process Conditions by PLS-Surface Response Design

Wheat Bran Pretreatment by Room Temperature Ionic Liquid-Water Mixture: Optimization of Process Conditions by PLS-Surface Response Design

Pretreatment for biorefineries: a review of common methods for efficient utilisation of lignocellulosic materials

Bioenergy from biofuel residues and waste

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