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• W2006043932 abstract "A prototype hardwood Populus deltoids has been fractionated in kg quantities into its primary constitutive polymers, namely, cellulose, hemicelluloses, and lignin, under optimal recovery conditions for each fraction. Our approach is targeted at processing sawdust or finally divided wood (dp ≤ 0.5 mm) and involves a thermomechano-solvolytic treatment of medium consistency suspensions in two process development units operated sequentially. Firstly, the hemicellulose fraction is removed from the initial wood by a aqueous-steam pretreatment (auto-hydrolysis) at conditions where nearly 90% of the hemicelluloses are solubilized. Secondly, the treated wood (lignocellulose) is separated into cellulose and lignin rich fractions by subjecting it to an organosolvolytic treatment using ethylene glycol as solvent. An experimental unit which can be operated in semi-continuous or continuous modes is described and was employed for this step. The recovery of each fraction via appropriate mass balances is presented. Also, a comparative characterization of the lignins isolated via (a) the direct solvolysis route and (b) the sequential aqueous-steam pretreatment followed by solvolysis approach is made using solvent fractionation, molar mass distribution, and 13C NMR spectroscopy methods. Un échantillon de bois dur Populus deltoids a été fractionné en ses polymères constitutifs principaux, à savoir la cellulose, l'hémicellulose et la lignine (quantités exprimées en kg), dans des conditions de récupération optimales pour chaque fraction. Le but de notre approche est de traiter la sciure ou les résidus de bois (dp ≤ 0,5 mm). Elle est basée sur un traitement thermomécano-solvolytique des suspensions de consistance moyenne dans deux unités de développement de procédés fonctionnant en mode séquentiel. Dans un premier temps la fraction d'hémicellulose est extraite du bois initial par un prétraitement à la vapeur (autohydrolyse) dans des conditions permettant la solubilisation de près de 90% de l'hémicellulose. Par la suite, on sépare le bois traité (lignocellulose) en fractions riches en lignine et en cellulose en lui faisant subir un traitement organosolvolytique avec de l'éthylène glycol comme solvant. Une unité expérimental fonctionnant soit en mode semi-continu ou continu est décrite et a été employée pour cette étape. On décrit la récupération de chaque fraction à l'aide des bilans massiques. En outre, on a effectué une caractérisation comparative des lignines isolées, d'une part, par la voie solvolytique directe et, d'autre part, par le prétraitement à la vapeur suivi d'une solvolyse en ayant recours au fractionnement par solvant, à la distribution de masse molaire et à la spectrométrie 13C NMR." @default.
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• W2006043932 title "Fractionation of woodmeal by prehydrolysis and thermal organosolv. Process strategy, recovery of constituents, and solvent fractionation of lignins so produced" @default.
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• W2006043932 doi "https://doi.org/10.1002/cjce.5450710116" @default.
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