Carbon Dioxide in Biomass Processing: Contributions to the Green Biorefinery Concept

Morais, Ana Rita C.; Lopes, André M. da Costa; Bogel‐Łukasik, Rafał

doi:10.1021/cr500330z

Cited by 258 publications

(151 citation statements)

References 197 publications

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“…Given the attractive properties of this mixture, the use of high-pressure CO 2 and CO 2 -H 2 O systems has led to several improvements and developments in biomass processing. 5,37 In particular, CO 2 and CO 2 -H 2 O systems have led to promising results in areas involving high value compound extraction/purification, hydrolysis and dehydration of carbohydrates and biomass-derived hydrogenation. …”

Section: Main Biorefinery Processesmentioning

confidence: 99%

“…Given the large variations in biomass composition and chemical structure, the conversion technology that is employed generally has to be tailored to the biomass characteristics and to the subsequent upgrading routes to avoid low yields, high energy expenditures and excessive waste production. 5 For this reason, the initial biomass processing, including biomass pre-treatment, is one the most challenging and expensive steps in the biorefinery and has a significant influence on downstream processing. The utilization of CO 2 -H 2 O mixtures in the pre-treatment and hydrolysis media have several advantages compared to conventional processes such as the dilute acid or organosolv processes.…”

Section: Catalytic Processesmentioning

confidence: 99%

“…4 Using biomass and organic wastes as a feedstock for renewable carbon represents a promising and sustainable alternative to fossil carbon. 5 However, exploiting biomass fully is associated with many challenges including the development of suitable conversion technologies both from an environmental and economic standpoint coupled with political support issues. The production of fuels from biomass has been criticized due to the so-called fuel vs. food competition.…”

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confidence: 99%

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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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Section: Main Biorefinery Processesmentioning

confidence: 99%

Section: Catalytic Processesmentioning

confidence: 99%

mentioning

confidence: 99%

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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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“…Numerous conventional methods for dissociating biomass into cellulose, hemicelluloses and lignin bioproducts have been investigated such as dilute acid hydrolysis, alkaline (Girio et al, 2010), hydrothermal steam explosion (Ruiz et al, 2008) and autohydrolysis (Carvalheiro et al, 2009). In addition, Morais et al (2015) presented the role of supercritical CO 2 as a media for pretreatment to improve the enzymatic digestibility to convert lignocellulosic or starch biomass into biofuels and biochemicals. Current processes to convert lignocellulosic biomass into useful raw materials are still considered inefficient and making the process cost competitive remains a big challenge.…”

Section: Introductionmentioning

confidence: 99%

Characterization of natural low transition temperature mixtures (LTTMs): Green solvents for biomass delignification

Yiin

Quitain

Yusup

et al. 2016

Bioresource Technology

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The aim of this work was to characterize the natural low transition temperature mixtures (LTTMs) as promising green solvents for biomass pretreatment with the critical characteristics of cheap, biodegradable and renewable, which overcome the limitations of ionic liquids (ILs). The LTTMs were derived from inexpensive commercially available hydrogen bond acceptor (HBA) and l-malic acid as the hydrogen bond donor (HBD) in distinct molar ratios of starting materials and water. The peaks involved in the H-bonding shifted and became broader for the OH groups. The thermal properties of the LTTMs were not affected by water while the biopolymers solubility capacity of LTTMs was improved with the increased molar ratio of water and treatment temperature. The pretreatment of oil palm biomass was consistence with the screening on solubility of biopolymers. This work provides a cost-effective alternative to utilize microwave hydrothermal extracted green solvents such as malic acid from natural fruits and plants.

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“…It is a major component of lignocellulosic biomass (15% to 30% by weight, 40% by energy) (Pandey and Kim 2011). The demand for alternative renewable energy sources has catapulted a carbon-based energy and material platform into prominence for the production of transportation biofuels and bulk "green" chemicals (Morais et al 2015). With respect to aromatic-based chemicals, the most accessible bio-based feedstock is lignin (Pińkowska et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Supercritical Water-induced Lignin Decomposition Reactions: A Structural and Quantitative Study

Jiang¹,

Lyu²,

Wu³

et al. 2016

BioResources

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The use of supercritical water for the decomposition of lignin and evaluation of its influence on lignin decomposition and conversion to various products was the thrust of the current study. Poplar alkali lignin (AL), corncob-to-xylitol residue lignin (XRL), and cornstalk-to-ethanol residue lignin (ERL) were the lignin species studied because they constitute the main residual lignins available in the biomass refinery industry. The lignins were characterized by elementary analysis, Fourier transform infrared spectrometry (FT-IR), phosphorus nuclear magnetic resonance ( 31 P-NMR), and X-ray diffraction (XRD), and their hydrothermal depolymerization products were analyzed by gas chromatography-mass spectrometer (GC-MS). The results showed that the residual lignin is a potential source for valuable aromatics. The XRL had the best total phenolics yield, 140 mg/g, while AL had the lowest, 90 mg/g. The maximum yields of phenol (28.94 mg/g) and 4-ethylphenol (36.21 mg/g) were obtained from XRL depolymerization at 375 °C for 30 min, and the optimal yields of guaiacol (14.34 mg/g) and 2,6-dimethoxyphenol (15.67 mg/g) were achieved by AL at 375 °C for 30 min. The information here provides some insights toward developing selective biorefinery methods for lignin-to-organic products conversion processes.

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Carbon Dioxide in Biomass Processing: Contributions to the Green Biorefinery Concept

Cited by 258 publications

References 197 publications

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

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

Characterization of natural low transition temperature mixtures (LTTMs): Green solvents for biomass delignification

Supercritical Water-induced Lignin Decomposition Reactions: A Structural and Quantitative Study

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