Optimization of processing conditions for the pretreatment of wheat straw using aqueous ionic liquid

Fu, Dongbao; Mazza, G.

doi:10.1016/j.biortech.2011.06.023

Cited by 114 publications

(70 citation statements)

References 33 publications

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“…The biomass pre-treatment with aqueous-IL mixtures A novel approach in the pre-treatments with ILs was highlighted recently [53,55,58,96,97]. The principle aim is water addition to the dissolution process, on the contrary to Swatloski et al who reported that water compromises the dissolution efficiency of biomass in the IL dissolution [13].…”

Section: The Pre-treatment Of Biomassmentioning

confidence: 99%

Ionic liquids as a tool for lignocellulosic biomass fractionation

Lopes

João

Morais

et al. 2013

sustain chem process

202

124

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Lignocellulosic biomass composes a diversity of feedstock raw materials representing an abundant and renewable carbon source. In majority lignocellulose is constituted by carbohydrate macromolecules, namely cellulose and hemicellulose, and by lignin, a polyphenilpropanoid macromolecule. Between these biomacromolecules, there are several covalent and non-covalent interactions defining an intricate, complex and rigid structure of lignocellulose. The deconstruction of the lignocellulosic biomass makes these fractions susceptible for easier transformation to large number of commodities including energy, chemicals and material within the concept of biorefinery. Generally, the biomass pre-treatment depends on the final goal in the biomass processing. The recalcitrance of lignocellulose materials is the main limitation of its processing once the inherent costs are excessively high for the conventional pre-treatments. Furthermore, none of the currently known processes is highly selective and efficient for the satisfactory and versatile use, thus, new methodologies are still studied broadly. The ionic liquid technology on biomass processing is relatively recent and first studies were focused on the lignocellulosic biomass dissolution in different ionic liquids (ILs). The dissolution in IL drives to the structural changes in the regenerated biomass by reduction of cellulose crystallinity and lignin content contrasting to the original biomass. These findings provided ILs as tools to perform biomass pre-treatment and the advantageous use of their specific properties over the conventional pre-treatment processes. This review shows the critical outlook on the study of biomass dissolution and changes occurred in the biomass during this process as well as on the influence of several crucial parameters that govern the dissolution and further pre-treatment process. The review of currently known methods of biomass fractionation in IL and aqueous-IL mixtures is also discussed here and perspectives regarding these topics are given as well.

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Section: The Pre-treatment Of Biomassmentioning

confidence: 99%

Ionic liquids as a tool for lignocellulosic biomass fractionation

Lopes

João

Morais

et al. 2013

sustain chem process

202

124

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“…In another study, on the pretreatment of wheat straw in aqueous IL solutions, the effects of pretreatment temperature (130 to 170 °C), time (0.5 to 5.5 h), and water content (0% to 100%) were studied. The optimized conditions were determined to be 158 °C for 3.6 h with 50.5% water content (w/w), and 71.4% of sugars were obtained (Fu and Mazza 2011;Da Costa Lopes et al 2013).…”

Section: Effect Of Water Contentmentioning

confidence: 99%

Factors Governing the Pretreatment Process of Lignocellulosic Biomass in an Acidic Pyrrolidonium Ionic Liquid

Wang

et al. 2016

BioResources

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Ionic liquid (IL)-assisted pretreatment is an important step in biochemical conversion of lignocellulosic biomass into biofuels. Design for low-cost ILs that efficiently work at a relatively low pretreatment temperature with a short processing time is of great interest. In this work, a functional acidic ionic liquid, 1-H-N-methyl-2-pyrrolidonium chloride ([Hnmp]Cl), was prepared by a simple synthetic procedure in a cost-effective manner and was then investigated for use in the pretreatment of lignocellulosic biomass. Factors including temperature, time, ratio of biomass to ionic liquid, and water content were studied to determine their impact on the pretreatment of lignocellulose; 91.39% of lignin content was recovered when the corn stalk was pretreated by pure [Hnmp]Cl at 100 °C for 45 min with a biomass loading of 5%. The highest glucose yield attained was 93.20% and the highest cellobiose yield was 18.76%, when the ratio of biomass to water was kept at 1:4. The pretreatment efficacy was dependent on the pretreatment temperature and processing time, which was more efficient for pure ionic liquid with respect to lignin recovery from lignocelluloses. However, more efficient enzymatic saccharification of cellulose-rich materials was achieved with aqueous ionic liquid.

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“…The best condition of lower ionic liquid concentration on the performance of producing biofuel should be investigated in the next research. Fu and Mazza [22] reported that optimum processing condition for fermentable sugars recovery was determined to 158 o C, 3.6 h and an ionic liquid concentration of 49.5% (w/w), the ionic liquid and substrate were [EMIM]Ac and wheat straw. The report indicated that low concentration of ionic liquid was allowed, to provides a potentially cost-effective way for biofuel production to compete with fossil fuels cost.…”

Section: Profiles Of Enzymatic Hydrolysis Of Regenerated Sugarcane Bamentioning

confidence: 99%

Application of Ionic Liquid [DMIM]DMP Pretreatment in the Hydrolysis of Sugarcane Bagasse for Biofuel Production

Widjaja

Agnesty

Sangian

et al. 2014

Bull. Chem. React. Eng. Catal.

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Sugarcane bagasse is one of lignocellulose materials that can be converted to biofuel. This work was aimed to develop new pretreatment combination methods to process sugarcane bagasse lignocellulose into biofuel (bio-hydrogen). Pretreatment of sugarcane bagasse using NaOH solution in combination with ionic liquid [DMIM]DMP enhanced the enzymatic hydrolysis significantly. After the pretreatment, the content of cellulose and hemicellulose increased by 29.31% compared to the untreated one. Cellulose and hemicelluloses were used as raw materials to produce reducing sugars, that can be converted to bio-hydrogen via fermentation. After being subjected to combined pretreatment processes, the crystalline index of sugarcane bagasse decreased significantly compared to solely NaOH pretratment. This indicates a more amorphous structure of the sugarcane bagasse, which makes it is easier to be hydrolyzed into reducing sugars. The recovery of cellulose + hemicellulose after pretreatment for 20 min and 120 °C was 92%, and the yield obtained was 0.556 g sugars/g (cellulose + hemicellulose) after 12 h and the bio-hydrogen yield was 0.46 mol H2/mol sugars consumed after 48 h fermentation. The use of recycled of ionic liquid showed similar performance compared to the use of fresh ionic liquid.

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Optimization of processing conditions for the pretreatment of wheat straw using aqueous ionic liquid

Cited by 114 publications

References 33 publications

Ionic liquids as a tool for lignocellulosic biomass fractionation

Ionic liquids as a tool for lignocellulosic biomass fractionation

Factors Governing the Pretreatment Process of Lignocellulosic Biomass in an Acidic Pyrrolidonium Ionic Liquid

Application of Ionic Liquid [DMIM]DMP Pretreatment in the Hydrolysis of Sugarcane Bagasse for Biofuel Production

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