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2014, Pure and Applied Chemistry
Since crude oil and biomass differ in various properties, new primary fractionation methods of biomass, secondary conversion pathways and processes have to be developed. Biorefineries combine the necessary technologies of the biogenic raw materials with those of intermediates and final products. The chemical industry is experiencing a fundamental shift as cost competitive biobased platform chemicals become a commercial reality. The paper is focused on lignocellulosic feedstock and green biomass biorefinery concepts, which are favored in research, development and industrial implementation. The production of aromatic platform chemicals, such as furfural, hydroxymethylfurfural and derivatives as well as aliphatic platform chemicals, such as levulinic acid and formic acid is described. Futhermore, functional products, such as proteins and biotechnological produced platform chemicals are considered.
Energies, 2019
The production of chemicals from biomass, a renewable feedstock, is highly desirable in replacing petrochemicals to make biorefineries more economical. The best approach to compete with fossil-based refineries is the upgradation of biomass in integrated biorefineries. The integrated biorefineries employed various biomass feedstocks and conversion technologies to produce biofuels and bio-based chemicals. Bio-based chemicals can help to replace a large fraction of industrial chemicals and materials from fossil resources. Biomass-derived chemicals, such as 5-hydroxymethylfurfural (5-HMF), levulinic acid, furfurals, sugar alcohols, lactic acid, succinic acid, and phenols, are considered platform chemicals. These platform chemicals can be further used for the production of a variety of important chemicals on an industrial scale. However, current industrial production relies on relatively old and inefficient strategies and low production yields, which have decreased their competitiveness ...
Biorefineries-Industrial Processes and Products, 2005
Current Opinion in Chemical Engineering, 2012
Fractionation of lignocellulosic biomass increases process flexibility and allows for integrated processing of C 5 and C 6 sugars. Recent advances using acidic treatments to deconstruct biomass in combination with organic solvents to create biphasic systems have allowed for increased yields of platform chemicals such as furfural, hydroxymethylfurfural, and levulinic acid. Management of the mineral acids used in pretreatment steps remains a challenge, but proper organic solvent selection, such as 2-sec-butylphenol, allows for complete recovery and recycle of mineral acid. Using solvents with high partition coefficients for extraction of products in biphasic unit operations allows the concentrations of products to be increased and improves the efficiency of downstream processing options, such as distillation or further upgrading reactions. Overall, fractionation of lignocellulosic biomass allows for a flexible, integrated processing approach that we hope will advance biorefining operations, allowing commercial biomass processing to become a reality.
Angewandte Chemie International Edition, 2007
Renewable and Sustainable Energy Reviews, 2015
Sustainable production of energy, fuels, organic chemicals and polymers from biomass in an integrated biorefinery is extremely important to reduce enslavement on limited fossil fuels. In the present article, the biomass was classified into four general types based on their origin: energy crops, agricultural residues and waste, forestry waste and residues and industrial and municipal wastes. The article further elucidates the chemistry of various types of biomass used in the biorefinery. The biorefinery was classified into three broad categories based on the chemistry of biomass: triglyceride, sugar and starchy and lignocellulosic. The article further presents a comprehensive outlines of opportunities and recent trends of each type of biorefinery. A brief overview of original and revised list of platform chemicals, their sources from biomass and derivative potentials were also articulated. The article also provides comparisons of different types of biorefinery, broad challenges and availability of biomass. Furthermore, the article provides an overview of hydrocarbon biorefinery for production of hydrocarbon fuels and building block chemicals from biomass.
Bioprocessing Technologies in Biorefinery for Sustainable Production of Fuels, Chemicals, and Polymers, 2013
Fermentation
The great demand for, and impending depletion of petroleum reserves, the associated impact of fossil fuel consumption on the environment, and volatility in the energy market have elicited extensive research on alternative sources of traditional petroleum-derived products such as biofuels and bio-chemicals. Fossil oil is largely associated with gasoline, however, approximately 6000 petroleum-derived products currently exist in the market, with diverse applications. Ironically, while biofuels are more popular with the public, the other petroleum-derived products have not attracted similar attention despite the vast economic values for these products. Thus, given the finite nature of petroleum, it is timely to deploy substantial resources and research efforts to the development of renewable chemicals (similar to the efforts devoted to biofuels). Theoretically, bio-production of gasoline-like fuels and the 6000 petroleum-derived products is within the realm of possibility, because aquatic and terrestrial ecosystems harbor an abundance of diverse microorganisms, capable of catalyzing unlimited numbers of chemical reactions. Moreover, the fields of synthetic biology and metabolic engineering have evolved to the point that a wide range of microorganisms can be induced or manipulated to catalyze foreign or vastly improve indigenous biosynthetic reactions. Hence the need for this Special Issue to provide a platform for highlighting recent progress on fuel and chemical production from renewable resources such as lignocellulosic biomass. This Special Issue, titled Biofuels and Biochemicals Production, consists of 13 articles in which eleven and two are research and review articles, respectively. The Special Issue covers themes on the development of different methodologies for efficient conversion of lignocellulosic biomass, agricultural wastes, carbon dioxide, and carbon monoxide to fuels (ethanol, butanol, hydrogen), chemicals (2,3-butanediol, acetone, acetic acid), and enzymes (cellulase). Some of the articles in this Special Issue provide recent advancements on pretreatment and hydrolysis of lignocellulosic biomass (LB) to lignocellulosic biomass hydrolysates (LBH), challenges associated with LBH utilization, and recommended mitigation strategies. Consistent with the Biofuels and Biochemicals Production theme, the research groups of Moreno [1] and Rosentrater [2] evaluated different pre-treatment technologies for efficient disruption and separation of lignin from the hemicellulose component of the LB to facilitate enzymatic hydrolysis of the carbohydrate fraction to fermentable sugars. By combining acid-catalyzed steam explosion and alkali-based extrusion process, the protective lignin structure of barley straw was disrupted, which resulted in hydrolysates with significant amounts of glucan and hemicellulose sugars, minimal concentrations of lignocellulose derived microbial inhibitory compounds (LDMICs), and a solid residue with significant amounts of lignin [1]. In addition, the Low-Moisture Anhydrous Ammonia (LMAA) pre-treatment method enhanced enzymatic hydrolysis of the cellulose component of the LB to glucose, thus, the potential is great for LMAA for LB pre-treatment [2]. Consistent with enzymatic hydrolysis of the cellulose component of LB, Bajaj's group contributes an article that highlights the capacity of Bacillus subtilis SV1 to use agroindustrial residues (LB) as carbon and nitrogen sources for
IARJSET, 2015
Biomass, as a renewable resource, has the potential to decrease our dependence on fossil fuels, provide energy security and mitigate environmental problems. Shifting dependence from petroleum-based to renewable biomass-based resources is generally viewed as key to the sustainable development and effective management of greenhouse gas emissions. There has been an increasing research interest in the assessment of bio-sourced materials recovered from residual biomass and their conversion techniques. Biomass which is generally considered as less important due to its light weight, bulkiness and less economic value can be a valuable feedstock in biorefineries. Many countries of the world are now on the way to effectively utilizing the so called neglected energy source for achieving greater and cleaner energy efficiency by adopting biorefinery approach. This review paper hereby critically examine the idea of biorefineries as a strategy for sustainability by using different available biomass feedstocks, techniques for their multipurpose conversion into useful chemicals, fuel and materials, and the associated challenges on the basis of relevant researches.
Biofuels, Bioproducts and Biorefining, 2020
The emergence of lignocellulosic biorefineries (LBRs) over the past few decades has shown tremendous potential for the development of sustainable renewable resources. Lignocellulosic biorefineries not only meet energy needs but also mitigate environmental problems by replacing conventional petroleum sources. Round the year availability of lignocellulosic biomass (LCB) with affordable price is a major factor in the development of biorefineries. It consists primarily of sugar polymers (cellulose and hemicellulose) and lignin, which can be used to produce second-generation (2G) biofuels such as bioethanol, biohydrogen, biobutanol, and renewable chemicals like lactic acid, succinic acid, and 5-hydroxymethylfurfural, the compound annual growth rate (CAGR) of which is predicted to be 16.43% by 2025. Several multinational companies, such as Raizen, Du Pont, BASF AG, Cargill, Braskem, and others have embarked on bio-based chemicals / biofuels production. However, biochemicals and even biofuels have not achieved the desired commercial goals due to a lack of feasibility and a lack of innovative techniques for bioprocessing or genetic engineering. Inappropriate feedstock logistics and lack of accurate life-cycle analyses of processes / products were also major drawbacks in developing commercially viable technologies from LCB. In this paper, therefore, recent technological advancements in LBRs, the current bio-renewable commercialization situation, and the intrinsic role of biorefinery in the circular bioeconomy have been elucidated.
Holzforschung, 2011
The demand for biomass-derived fuels and fuel additives, particularly in the transportation sector, has stimulated intense research efforts in the chemistry of levulinic acid and levulinic acid secondary products over the past decade. Additionally, recent technological progress in lignocellulosic feedstock (LCF) chemistry has also increased attention in this regard. As a result, several oxygenating fuel additives with potential applications in both gasoline and diesel fuels have been identified. Some of the chemicals, such as ethyl valerate, appear to be viable alternatives to the currently used branched, short-chain ethers that are derived from side products of petrol refining. Cost-effective applications of lignocellulosic biomass are a crucial aspect of its feasibility. In consideration of the LCF biorefinery concept, the feasibility must also include the chemical pulping of LCF and the comprehensive utilisation of its main constituents cellulose, hemicelluloses, and lignin. The ...
ChemInform, 2014
The various strategies for the valorisation of waste biomass to platform chemicals, and the underlying developments in chemical and biological catalysis which make this possible, are critically reviewed. The option involving the least changes to the status quo is the drop-in strategy of complete deoxygenation to petroleum hydrocarbons and further processing using existing technologies. The alternative, redox economic approach, is direct conversion of, for example, carbohydrates to oxygenates by fermentation or chemocatalytic processes. Examples of both approaches are described, e.g. fermentation of carbohydrates to produce hydrocarbons, lower alcohols, diols and carboxylic acids or acid catalyzed hydrolysis of hexoses to hydroxymethyl furfural (HMF) and subsequent conversion to levulinic acid (LA), γ-valerolactone (GVL) and furan dicarboxylic acid (FDCA). Three possible routes for producing a bio-based equivalent of the large volume polymer, polyethylene terephthalate (PET) are delineated. Valorisation of waste protein could, in the future, form an important source of amino acids, such as L-glutamic acid and L-lysine, as platform chemicals, which in turn can be converted to nitrogen containing commodity chemicals.
BioMed Research International, 2016
Clean technologies and environmental policy, 2018
Until recently, most of energy and industrially produced chemicals were derived from fossil fuel-based resources. This along with the continued depletion of finite fossil resources and their attributed adverse environmental impacts, alternatively sourced and more sustainable resources are being pursued as feedstock replacements. Thus, biomass has been identified as an alternate renewable and more sustainable resource as a means to reduce this sector's dependence on fossil fuel-based resources and to alleviate their environmental impacts. As such, lignocellulosic biomass has been further identified and demonstrated as an abundant renewable resource for the production of biofuels, platform chemicals, and their respective value-added products. This review article provides an overview of the techniques developed for the valorization of biomass in the production of platform chemicals within a biorefinery, and the status for commercialization.
2020
We propose an integrated strategy for the production of vital platform chemicals, levoglucosenone (LGO) and 5-hydroxymethylfurfural (HMF), used to produce a high-value chemical, 1,6-hexandiol, from lignocellulosic biomass. In such processes of producing essential chemicals from biomass, cellulose loading in the solvent has a significant impact on production yield and, consequently, the economics of the process. In this study, we compare four different loadings of 1, 3, 5, and 10 wt% to suggest the optimal cellulose loading in tetrahydrofuran. The integrated process is economically optimal at a cellulose loading of 5 wt%.
Fermentation
Lignocellulosic biomasses (LCB) are sustainable and abundantly available feedstocks for the production of biofuel and biochemicals via suitable bioconversion processing. The main aim of this review is to focus on strategies needed for the progression of viable lignocellulosic biomass-based biorefineries (integrated approaches) to generate biofuels and biochemicals. Processing biomass in a sustainable manner is a major challenge that demands the accomplishment of basic requirements relating to cost effectiveness and environmental sustainability. The challenges associated with biomass availability and the bioconversion process have been explained in detail in this review. Limitations associated with biomass structural composition can obstruct the feasibility of biofuel production, especially in mono-process approaches. In such cases, biorefinery approaches and integrated systems certainly lead to improved biofuel conversion. This review paper provides a summary of mono and integrated ...
Waste and Biomass Valorization, 2015
One of the main constraints and the most costly step in the production of lignocellulosic ethanol is the biomass pretreatment step that aims at liberating the cellulose by dissolving the lignin and the hemicellulose fractions. For this reason, several pretreatment methods have been developed that aim at dissolving biomass lignin and hydrolysing the cellulosic part in order to maximize fermentation yields towards ethanol. In this work, delignification of a forestry residue was carried out via a Milox treatment and its variations. Formic acid (FA) with hydrogen peroxide (HP) was used as the delignifying agent and the effects of temperature and HP concentration were investigated. Hydrolysis of untreated and delignified biomass samples with hot water (HW) was also carried out to depolymerize the solid feed.
Biofuels that are produced from biobased materials are a good alternative to petroleum based fuels. They offer several benefits to society and the environment. Producing second generation biofuels is even more challenging than producing first generation biofuels due the complexity of the biomass and issues related to producing, harvesting, and transporting less dense biomass to centralized biorefineries. In addition to this logistic challenge, other challenges with respect to processing steps in converting biomass to liquid transportation fuel like pretreatment, hydrolysis, microbial fermentation, and fuel separation still exist and are discussed in this review. The possible coproducts that could be produced in the biorefinery and their importance to reduce the processing cost of biofuel are discussed. About $1 billion was spent in the year 2012 by the government agencies in US to meet the mandate to replace 30% existing liquid transportation fuels by 2022 which is 36 billion gallons/year. Other countries in the world have set their own targets to replace petroleum fuel by biofuels. Because of the challenges listed in this review and lack of government policies to create the demand for biofuels, it may take more time for the lignocellulosic biofuels to hit the market place than previously projected.
2009
The objective of the Integrated Project BIOSYNERGY (2007-2010) is to contribute to the costeffective use of biomass-especially lignocellulose and residues-by sound techno-economic process development of integrated production of value-added chemicals, transportation fuels and energy from lab-scale to demonstration at pilot-scale. The aim is to develop innovative, fully integrated, synergetic biorefinery concepts, using advanced fractionation and conversion processes, and combining biochemical and thermochemical pathways. One of the objectives is to make the production of biofuels more cost effective by utilisation of all biomass components at maximum added value. Furthermore the project addresses the identification of the most promising biorefinery chains for the EU based on energy efficiency, environmental performance, socioeconomic aspects and cost. The project is performed by a consortium comprising 17 partners from industry, research institutes and universities from 10 EU countries and is supported by the European Commission through its Sixth Framework Programme. This paper highlights the objectives and approach of the project and provides an overview of the R&D results to date.
Biotechnology for Biofuels, 2013
Current opinion in biotechnology, 2016
The feedstocks used for the production of bio-based chemicals have recently expanded from edible sugars to inedible and more recalcitrant forms of lignocellulosic biomass. To produce bio-based chemicals from renewable polysaccharides, several bioprocessing approaches have been developed and include separate hydrolysis and fermentation (SHF), simultaneous saccharification and fermentation (SSF), and consolidated bioprocessing (CBP). In the last decade, SHF, SSF, and CBP have been used to generate macromolecules and aliphatic and aromatic compounds that are capable of serving as sustainable, drop-in substitutes for petroleum-based chemicals. The present review focuses on recent progress in the bioprocessing of microbially produced chemicals from renewable feedstocks, including starch and lignocellulosic biomass. In particular, the technological feasibility of bio-based chemical production is discussed in terms of the feedstocks and different bioprocessing approaches, including the con...
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