Pyrolysis behavior of levoglucosan as an intermediate in cellulose pyrolysis: polymerization into polysaccharide as a key reaction to carbonized product formation
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In this article, a pathway of cellulose pyrolysis via anhydromonosaccharide is proposed including polymerization to polysaccharides (a reversible reaction) as a key reaction to carbonized product formation.Abstract:
Pyrolysis behavior of levoglucosan (1,6-anhydro-β-d-glucopyranose), the major anhydromonosaccharide formed during cellulose pyrolysis, was studied at 250°–400°C under nitrogen. The pyrolysis products were found to change stepwise: levoglucosan → MeOH-soluble fraction (lower-molecular-weight products and oligosaccharides) → water-soluble fraction (polysaccharides) → insoluble fraction (carbonized products). From the present experimental results, a pathway of cellulose pyrolysis via anhydromonosaccharide is proposed including polymerization to polysaccharides (a reversible reaction) as a key reaction to carbonized product formation.read more
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References
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A kinetic model for pyrolysis of cellulose.
TL;DR: In this article, it was shown that the pyrolysis of cellulose at low pressure (1.5 Torr) can be described by a three reaction model, where an initialization reaction leads to formation of an active cellulose which subsequently decomposes by two competitive first-order reactions, one yielding volatiles and the other char and a gaseous fraction.
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Principles and practice of biomass fast pyrolysis processes for liquids
TL;DR: In this article, the authors review the design considerations faced by the developers of fast pyrolysis, upgrading and utilisation processes in order to successfully implement the technologies and discuss the aspects of design of a fast-pharma system including feed drying, particle size, pretreatment, reactor configuration, heat supply, heat transfer, heating rates, reaction temperature, vapour residence time, secondary cracking, char separation, ash separation, liquids collection.
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Introduction to pyrolysis of biomass
TL;DR: The pyrolytic properties of biomass are controlled by the chemical composition of its major components, namely cellulose, hemicelluloses and lignin and their minor components including extractives and inorganic materials as mentioned in this paper.
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Pyrolysis of cellulose.
Fred Shafizadeh,Y.L. Fu +1 more
TL;DR: Pyrolysis of cellulose under vacuum and atmospheric pressure gave a tar that had no reducing end-group, was randomly linked, contained some furanoid rings, and was very similar to the polysaccharide condensation-product of 1,6-anhydro-β-D-glucose.
Journal ArticleDOI
Production of levoglucosan and glucose from pyrolysis of cellulosic materials
TL;DR: In this paper, it was found that pyrolysis proceeds at a much faster rate at the higher temperatures without detrimental effect on the yields, yielding a tar that contained 39% levoglucosan and, upon mild acid hydrolysis, gave 49% Dglucose.