Green and sustainable manufacture of chemicals from biomass: state of the art
文献情報
Roger A. Sheldon
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. Glycerol, the coproduct of biodiesel manufacture from triglycerides, is another waste stream for which valorisation to commodity chemicals, such as epichlorohydrin and acrolein, is an attractive option.
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Green Chemistry provides a unique forum for the publication of innovative research on the development of alternative green and sustainable technologies. The scope of Green Chemistry is based on, but not limited to, the definition proposed by Anastas and Warner (Green Chemistry: Theory and Practice, P T Anastas and J C Warner, Oxford University Press, Oxford, 1998). Green chemistry is the utilisation of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. Green Chemistry is at the frontiers of this continuously-evolving interdisciplinary science and publishes research that attempts to reduce the environmental impact of the chemical enterprise by developing a technology base that is inherently non-toxic to living things and the environment. Submissions on all aspects of research relating to the endeavour are welcome. The journal publishes original and significant cutting-edge research that is likely to be of wide general appeal. To be published, work must present a significant advance in green chemistry. Papers must contain a comparison with existing methods and demonstrate advantages over those methods before publication can be considered. For more information please see this Editorial. Coverage includes the following, but is not limited to: Design (e.g. biomimicry, design for degradation/recycling/reduced toxicity…) Reagents & Feedstocks (e.g. renewables, CO2, solvents, auxiliary agents, waste utilization…) Synthesis (e.g. organic, inorganic, synthetic biology…) Catalysis (e.g. homogeneous, heterogeneous, enzyme, whole cell…) Process (e.g. process design, intensification, separations, recycling, efficiency…) Energy (e.g. renewable energy, fuels, photovoltaics, fuel cells, energy storage, energy carriers…) Applications (e.g. electronics, dyes, consumer products, coatings, pharmaceuticals, preservatives, building materials, chemicals for industry/agriculture/mining…) Impact (e.g. safety, metrics, LCA, sustainability, (eco)toxicology…) Green chemistry is, by definition, a continuously-evolving frontier. Therefore, the inclusion of a particular material or technology does not, of itself, guarantee that a paper is suitable for the journal. To be suitable, the novel advance should have the potential for reduced environmental impact relative to the state of the art. Green Chemistry does not normally deal with research associated with 'end-of-pipe' or remediation issues.










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