TG/DTG as a rapid method for the characterization of solid residues derived from liquefaction of lignocellulosics

Chauvette, G.; Heitz, Michèle; Rubio, Manuel Prieto; Khorami, J.; Chornet, E.; Ménard, Hugues

doi:10.1016/0040-6031(85)85368-5

Cited by 33 publications

(12 citation statements)

References 2 publications

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“…The graphs of the copolymer fraction in Fig. 3b show that the bark components have a broad degradation peak at 380 • C. This is consistent with researchers who have shown that larger biopolymers like hemi-cellulose, cellulose, and lignins start to breakdown at 280-330 • C, 350 • C, and 450 • C, respectively (Chauvette et al, 1985). The minute peak at 150 • C present in the copolymer would seem to indicate that the bark components have some degree of polypropylene oxide grafting.…”

Section: Thermo-gravimetric Analysis (Tga) Of the Polyol Componentssupporting

confidence: 89%

Synthesis and characterization of bio-polyols through the oxypropylation of bark and alkaline extracts of bark

D’Souza

George

Camargo

et al. 2015

Industrial Crops and Products

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Section: Thermo-gravimetric Analysis (Tga) Of the Polyol Componentssupporting

confidence: 89%

Synthesis and characterization of bio-polyols through the oxypropylation of bark and alkaline extracts of bark

D’Souza

George

Camargo

et al. 2015

Industrial Crops and Products

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“…In air, all three wood components could be determined by the DTG method (Chauvette et al 1985). The DSC curve gave the multicomponent exotherm, which Starts at 223 °C.…”

Section: Resultsmentioning

confidence: 99%

Flame Retardancy Effect of Elemental Sulphur Caused by Covering the Lignocellulose Materials

Simkovic¹,

Balog²,

Micko³

1991

Holzforschung

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Lignocellulose materials were activatcd with concentrated acids and subsequently modified with sulphur containing inorganic salts.The obtained results indicate that the formed materials contain elemental sulphur. Their limited oxygen indexes (LOI) varied from 21.9 to 75.0 vol. % of oxygen and some of them did not burn even in an environment of 99.8 vol. % of oxygen. TheTG, DTG, and DSC analysis indicated that sulphur-containing compounds are gasificd at temperatures close to 200°C and are not incorporated in the residue.The flame-retardancy effect is probably caused by the insulation of the material by the sulphur layer formed on the surface of the boards.

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“…La quasi-absence de sensibilit e aux conditions de torr efaction t emoigne du caractère aromatique mineur et d'une contribution en carbone aliphatique sp 3 majoritaire dans le pic C1. Selon Chauvette et coll., [61] la composition massique du peuplier faux-tremble serait de 51.2 % de cellulose, 27.7 % d'h emicellulose et de 21.1 % de lignine. Par ailleurs, Sarvaramini et coll., [28] ont trouv e qu'en termes de production d'espèces volatiles durant la torr efaction conventionnelle de cette essence, les contributions pond erales effectives de la cellulose, de l'h emicellulose et de la lignine, s' elevaient, respectivement, à 4 %, 15 % et 8 %.…”

Section: O1sunclassified

Torréfaction de la biomasse lignocellulosique dans les liquides ioniques: Analyse comparative par spectroscopies de surface

et al. 2014

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Torrefaction is a thermal pretreatment used to improve the physicochemical properties of lignocellulosic biomass prior to its thermochemical conversion. In this study, aspen wood imbued with a hydrophilic ionic liquid (1-ethyl-3-methyl imidazolium trifluoromethanesulfonate) was torrefied, and the properties of the solid product were compared to those from conventional dry torrefaction. The solid products were characterized using X-ray photoelectron spectroscopy X (XPS), photoelectron energy loss spectroscopy (ESCALOSS), and X-ray excited Auger electron spectroscopy X (XAES) in order to study the biomass surface modifications due to ionic-liquid torrefaction in comparison to dry torrefaction. The results obtained show that ionic liquids led to lignin degradation while dry torrefaction mostly affected the carbon-rich extractives. Lignin degradation was monitored using ESCALOSS and XAES techniques, which unveiled reduction in sp 2 hybridized carbon forms. Finally, ionic-liquid assisted torrefaction of the main biomass components, i.e., lignin, cellulose and hemicellulose, treated individually, showed a decrease in their O/C ratio in line with improved hydrophobicity and robustness against moisture uptake by the torrefied products. The diversity of trends revealed by our surface analysis study during the torrefaction of bare or ionic-liquid-impregnated wood, especially by means of ESCALOSS and XAES, requires the pursuit of research in order to describe more in-depth the physicochemical processes involved during torrefaction.La torr efaction est un proc ed e de pr etraitement servant à am eliorer les propri et es physicochimiques de la biomasse lignocellulosique pr ec edant sa conversion thermochimique. Dans cette etude, des echantillons de bois du type peuplier faux-tremble ont et e torr efi es selon deux modes : par torr efaction sèche conventionnelle et par impr egnation avec un liquide ionique hydrophile (1-ethyl-3-m ethyl imidazolium trifluorom ethanesulfonate) suivie d'une torr efaction. Les produits solides de torr efaction ont et e caract eris es au moyen de la spectroscopie des photo electrons X, de la spectroscopie des pertes d' energie des photo electrons (ESCALOSS) et de la spectrom etrie des electrons Auger induits par rayons X (XAES) afin de d eterminer les modifications chimiques de surface induites par ces deux modes de torr efaction. Les r esultats ont montr e que la torr efaction des echantillons de bois dans un liquide ionique contribue à la d egradation de la lignine alors que la torr efaction sèche entraîne la suppression partielle des extractibles riches en carbone. La d egradation de la lignine a egalement et e suivie par ESCALOSS et XAES qui ont r ev el e une diminution de la contribution de carbones hybrid es sp 2 . Enfin, l'utilisation de liquide ionique pour la torr efaction des principaux composants de bois (h emicellulose, cellulose et lignine), pris individuellement, a montr e qu'il y a une diminution du rapport O/C sugg erant que les produits solides torr efi es dans les liquides ionique...

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TG/DTG as a rapid method for the characterization of solid residues derived from liquefaction of lignocellulosics

Cited by 33 publications

References 2 publications

Synthesis and characterization of bio-polyols through the oxypropylation of bark and alkaline extracts of bark

Synthesis and characterization of bio-polyols through the oxypropylation of bark and alkaline extracts of bark

Flame Retardancy Effect of Elemental Sulphur Caused by Covering the Lignocellulose Materials

Torréfaction de la biomasse lignocellulosique dans les liquides ioniques: Analyse comparative par spectroscopies de surface

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