The CO<sub>2</sub>-assisted autohydrolysis of wheat straw

Silva, Sara P. Magalhães da; Morais, Ana Rita C.; Bogel‐Łukasik, Rafał

doi:10.1039/c3gc41870g

Cited by 100 publications

(60 citation statements)

References 34 publications

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“…1,2 Lignocellulosic biomass is mainly composed of three major compounds (cellulose, hemicelluloses and lignin). [5][6][7] During the hydrothermal pretreatment process, hemicelluloses in the cell wall of lignocellulosic biomass can be degraded into oligosaccharide or monosaccharide, which can further be converted into platform chemicals such as furfural, xylitol and ethanol etc. 3 Thus, the pretreatment of biomass is considered to be a potential way to solve this problem by physical and chemical treatment.…”

Section: Introductionmentioning

confidence: 99%

“…9 Recently, the production of furfural and 5-hydroxymethylfurfural from biomass by a catalytic process has been extensively studied. 6 Recent studies have focused on ionic liquids (ILs) for the conversion of lignocellulosic biomass and cellulose into furfural and HMF. 10 Some problems are presented in this process such as corrosion of the equipment and environmental risks.…”

Section: Introductionmentioning

confidence: 99%

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Corncob lignocellulose for the production of furfural by hydrothermal pretreatment and heterogeneous catalytic process

Deng

Ren

et al. 2015

RSC Adv.

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Corncob with a high content of pentose-rich hemicelluloses shows great potential for furfural production. In this paper, an environmentally-friendly two-step process for furfural production was developed by the hydrothermal pretreatment of corncob and the heterogeneous catalysis of the hydrolysate using a solid acid catalyst. The hydrothermal pretreatment was applied to release hemicelluloses from the cell wall of the corncob, which were hydrolyzed into monosaccharide and oligosaccharide under the investigated conditions (160-190 C, 0-60 min). Subsequently, heterogeneous catalysis of the hydrolysate obtained from the hydrothermal pretreatment was performed using SO 4 2À /SiO 2 -Al 2 O 3 /La 3+ as a solid acid catalyst at 150 C for 2.5 h. The maximum yield of furfural achieved was up to 21% under the investigated experimental conditions from the catalysis of hydrolysates obtained at 190 C for 60 min in the hydrothermal process. Moreover, there was no obvious change in the catalytic activity of SO 4 2À /SiO 2 -Al 2 O 3 /La 3+ after four runs, and only a decline of 5.28% yield of furfural was observed. This two-step process is an environmentally-friendly process for furfural production from pentose-rich biomass and serves as an effective approach for recovering the solid catalyst from the reaction medium.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Corncob lignocellulose for the production of furfural by hydrothermal pretreatment and heterogeneous catalytic process

Deng

Ren

et al. 2015

RSC Adv.

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“…117 The in situ generated acidic medium does not constitute an environmental problem because simple depressurisation of CO 2 increases the pH value of the liquor. 114 Thus, it can be concluded that highpressure CO 2 -H 2 O technology offers benefits similar to mineral acid-based processes without the typical drawbacks, such as the formation of undesired dehydration products (i.e., furfural, 5-HMF), and the need for acid neutralisation after reaction.…”

Section: Co 2 -Assisted Processesmentioning

confidence: 99%

“…[114][115][116] Additionally, besides the chemical effect, the physical interaction plays an important role as well. The physical phenomenon is based on the interaction of liquid hot water with polysaccharides, while at the same time CO 2 acts as a catalyst, increasing the diffusion of water molecules into the pores of the biomass causing a biomass swelling effect.…”

Section: Co 2 -Assisted Processesmentioning

confidence: 99%

Pre-treatment and extraction techniques for recovery of added value compounds from wastes throughout the agri-food chain

et al. 2016

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“…[75][76][77][78][79][80][81][82] Notably, the formation of carbonic acid can enhance the rate of acid-catalyzed reactions, which include hydrolysis and dehydration, without the drawback of neutralization and/or solvent recovery. 75,76,[82][83][84][85][86] The use of CO 2 -H 2 O mixtures during biomass pre-treatment has also been shown to reduce the crystallinity of the cellulose-rich fraction allowing a reduction in enzyme loading of 33% during subsequent saccharification. 86 Relvas et al modelled the kinetics of the hemicellulose, xylan and arabinan hydrolysis in the presence of CO 2 added during hydrothermal processes and demonstrated that the formation of carbonic acid led to an increase in the kinetic reaction constants for both intermediates and final products.…”

Section: Catalytic Processesmentioning

confidence: 99%

Introduction to High Pressure CO2 and H2O Technologies in Sustainable Biomass Processing

Questell‐Santiago

Luterbacher

2017

High Pressure Technologies in Biomass Conversion

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Biomass is an attractive source of renewable carbon-based fuels and chemicals and their production is envisaged within the framework of integrated biorefineries. Multiple research efforts to make biorefineries more economically competitive and sustainable are ongoing. In this context the use of high-pressure CO2 and CO2/H2O mixtures for biomass conversion is especially attractive. These mixtures are cheap, renewable, environmentally benign and allow tuning of various processing parameters by varying temperature, pressure and CO2 loading. This chapter presents a broad introduction of the principal processes and conversion routes being considered within biorefineries, and how high-pressure CO2 and CO2/H2O mixtures could help address certain challenges associated with biomass conversion. Some of the principle advantages associated with high-pressure CO2 and CO2/H2O mixtures that we highlight here are their abilities to act as green substitutes for unsustainable solvents, to enhance acid-catalysed reaction rates by in situ carbonic acid formation, to reduce mass transfer-limitations, and to increase access to substrates and catalysts. We discuss these advantages in the context of the trade-offs associated with implementing large-scale high-pressure systems including safety concerns and increased capital costs. With this introduction, we highlight both the principal benefits and challenges associated with the use of high-pressure CO2 and CO2/H2O mixtures, which are further detailed in subsequent chapters.

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The CO₂-assisted autohydrolysis of wheat straw

Cited by 100 publications

References 34 publications

Corncob lignocellulose for the production of furfural by hydrothermal pretreatment and heterogeneous catalytic process

Corncob lignocellulose for the production of furfural by hydrothermal pretreatment and heterogeneous catalytic process

Pre-treatment and extraction techniques for recovery of added value compounds from wastes throughout the agri-food chain

Introduction to High Pressure CO2 and H2O Technologies in Sustainable Biomass Processing

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The CO2-assisted autohydrolysis of wheat straw

Cited by 100 publications

References 34 publications

Corncob lignocellulose for the production of furfural by hydrothermal pretreatment and heterogeneous catalytic process

Corncob lignocellulose for the production of furfural by hydrothermal pretreatment and heterogeneous catalytic process

Pre-treatment and extraction techniques for recovery of added value compounds from wastes throughout the agri-food chain

Introduction to High Pressure CO2 and H2O Technologies in Sustainable Biomass Processing

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The CO₂-assisted autohydrolysis of wheat straw