WorldCat Identities

Brosse, Nicolas

Overview
Works: 38 works in 49 publications in 2 languages and 768 library holdings
Roles: Editor, Author of afterword, colophon, etc., Other, Thesis advisor, Opponent, Author, Contributor
Publication Timeline
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Most widely held works by Nicolas Brosse
Chimie organique : les cours de Paul Arnaud by Paul Arnaud( Book )

7 editions published between 2009 and 2021 in French and held by 325 WorldCat member libraries worldwide

Le cours fournit les bases essentielles en chimie organique (structure des molécules, nomenclature, stéréochimie, mécanismes réactionnels, fonctions simples), afin d'aborder facilement les fonctions multiples et mixtes, les hétérocycles et les composés naturels (glucides, terpènes, protides, stéroïdes).Des QCM et questions et exercices donnent à l'étudiant la possibilité d'évaluer ses acquis et d'approfondir son travail
Exercices résolus de chimie organique les cours de Paul Arnaud by Paul Arnaud( Book )

5 editions published between 2010 and 2016 in French and held by 233 WorldCat member libraries worldwide

Ce recueil d'exercices résolus couvre les bases de la chimie organique : structure des molécules, isomérie, stéréochimie, mécanismes réactionnels,fonctions simples, principales fonctions multiples et mixtes. Il constitue un complément à la 18e édition du Cours de chimie organique, mais il peut être utilisé indépendamment de celui-ci.--[Memento]
Chimie organique : cours, QCM et applications by Paul Arnaud( Book )

1 edition published in 2004 in French and held by 119 WorldCat member libraries worldwide

Consacré aux bases de la chimie organique, ce cours tout en couleur ne suppose aucun préalable en chimie organique. Il s'attache à montrer l'existence et la régularité des relations entre la structure et la réactivité. La description des principaux mécanismes réactionnels est essentiellement au service de cette recherche de la compréhension. Plus de 300 questions et applications sous forme d'exercices corrigés permettent à l'étudiant d'évaluer ses connaissances. Ce cours aborde aussi les fonctions mixtes et multiples des hétérocycles et des composés naturels, et il donne également un aperçu de la chimie organique industrielle. (Somabec)
Chimie organique : les cours de Paul Arnaud by Paul Arnaud( )

1 edition published in 2015 in French and held by 28 WorldCat member libraries worldwide

Exercices résolus de chimie organique : les cours de Paul Arnaud by Paul Arnaud( )

1 edition published in 2016 in French and held by 20 WorldCat member libraries worldwide

Acetyl groups in Typha capensis: fate of acetates during organosolv and ionosolv pulping by Idi Guga Audu( )

1 edition published in 2018 in English and held by 3 WorldCat member libraries worldwide

Abstract: During biomass fractionation, any native acetylation of lignin and heteropolysaccharide may affect the process and the resulting lignin structure. In this study, Typha capensis (TC) and its lignin isolated by milling (MWL), ionosolv (ILL) and organosolv (EOL) methods were investigated for acetyl group content using FT-Raman, 1H NMR, 2D-NMR, back-titration, and Zemplén transesterification analytical methods. The study revealed that TC is a highly acetylated grass; extractive free TC (TCextr) and TC MWL exhibited similar values of acetyl content: 6 wt % and 8 wt % by Zemplén transesterification, respectively, and 11 wt % by back-titration. In contrast, lignin extracted from organosolv and [EMIm][OAc] pulping lost 80% of the original acetyl groups. With a high acetyl content in the natural state, TC could be an interesting raw material in biorefinery in which acetic acid could become an important by-product
Hydrothermal conversion of wood, organosolv, and chlorite pulps by Felipe Buendia-Kandia( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Comparison of the Physicochemical Properties and Thermal Stability of Organosolv and Kraft Lignins from Hardwood and Softwood Biomass for Their Potential Valorization by Mohamed Fodil Cherif( )

1 edition published in 2020 in English and held by 2 WorldCat member libraries worldwide

Influence of high voltage electrostatic field (HVEF) on bonding characteristics of Masson (Pinus massoniana Lamb.) veneer composites by Qian He( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Etude de procédés de dépolymérisation d'oligosaccharides d'hémicelluloses dans le cadre d'une bioraffinerie papetière by Valentin Guigon( )

1 edition published in 2019 in French and held by 2 WorldCat member libraries worldwide

Lignocellulosic biomass is made of 30% of hemicelluloses. Hemicelluloses are themselves made of saccharides that are true platform chemicals due to their ability to be transformed into many different products. Within the context of a biorefinery, hemicelluloses were solubilized as monosaccharides and oligosaccharides after a water pre-hydrolysis treatment. Secondary acid and enzymatic hydrolysis treatments were further applied to the obtained hydrolysate to depolymerize as much oligosaccharides as possible to monosaccharides (acid hydrolysis) and to depolymerize as much as xylans as possible to xyloses (enzymatic hydrolysis). Treatments were optimized to pilot scale
Etude de l'impact de l'extraction des hémicelluloses du bois sur les procédés d'obtention de cellulose et d'éthanol dans le cadre d'une bioraffinerie lignocellulosique by Lucie Boiron( )

1 edition published in 2012 in French and held by 2 WorldCat member libraries worldwide

Biofuel revival could be a great opportunity for the chemical pulp industry to widen the range ofits products made from wood. This thesis deals with the integration of a softwood hemicelluloseextraction step prior to the Kraft pulping process in order to produce both cellulose fibres andbioethanol.In this study the experimental work covers the entirety of the process: from the extraction ofmore than half of the hemicelluloses from wood either by autohydrolysis or dilute acid hydrolysis tothe production of bleached cellulosic fibres as well as ethanol from fermentated wood hydrolyzates.Prehydrolyzed wood and their subsequent pulps stood out by their excellent delignification abilityduring Kraft cooking and oxygen bleaching. Quantitative analysis of the main constituants of thepulps showed why prehydrolysis leads to decreased Kraft pulp yields (extra lignin loss andhemicelluloses loss including xylans). A range of hypotheses to explain the good delignificationability of prehydrolyzed wood Kraft pulps during oxygen bleaching was narrowed to one by Kraftlignin analysis.The overall results of the hemicellulose extraction prior to Kraft pulping as it has been defined inthis study showed that from 100 kg of softwood, 27 to 36 kg of bleached cellulosic fibres and 6litres of ethanol could be produced. The bleached cellulosic fibres are of great interest for dissolvingpulp or cellulose nanocrystals production
Contribution à l'étude des complexes lignine-hydrates de carbone (LCC) dans le bois : étude de l'impact des différentes étapes d'un procédé de bioraffinerie sans soufre sur les LCC by Claire Monot( )

1 edition published in 2015 in French and held by 2 WorldCat member libraries worldwide

The valorization of lignocellulosic biomass is nowadays a major issue due to the reduction of fossil resources. Separating each component to valorize them the best way as possible is the goal of the pulp and paper biorefineries. The effluent of the mill, called the black liquor, is currently burnt to produce energy, but gasification would increase the energy efficiency. For this, a sulfur-free cooking of wood is necessary, as sulfur inhibits gasification.Therefore this study first focused on the feasibility of cooking without sulfur, which is more difficult than a conventional kraft cooking containing sulfur. The work was done on softwood which is more difficult to delignify than hardwood. The wood was first pretreated with an autohydrolysis to remove hemicelluloses for further valorization.The results were conclusive for the production of cellulose pulp for chemical applications. To explain the differences obtained, structural differences of wood components were looked for. Lignin did not show major differences whether the wood was prehydrolyzed or not, whereas the complexes between lignin and carbohydrates (LCCs) showed significant differences, which would explain the results obtained
A Convenient Synthesis of Singly 15N-Labeled Isoniazid( )

1 edition published in 2000 in English and held by 2 WorldCat member libraries worldwide

Nouvelles synthèses de composés polycycliques cyclopentaniques : une application des réactions d'élimination-addition réalisées au moyen des bases complexes by Nicolas Brosse( Book )

2 editions published in 1993 in French and held by 2 WorldCat member libraries worldwide

Les alkylidènes cyclobutanols sont des composés obtenus en grande quantité par condensation d'énolates de cétone sur des intermédiaires cycliques tendus de type "ène" ou "yne" à courte durée de vie, engendrés grâce aux bases complexes. La présence d'un groupement méthylène cyclobutane permet de préparer, à partir de ces composés, des dérives fonctionnelles capables de se réarranger par migration d'un côté de cycle. Selon le type de fonctionnalisation envisagé, la transposition peut conduire à la synthèse de composés bicycliques ou tricycliques cyclopentaniques. Ainsi, les composés bicycliques sont obtenus en transformant, dans un premier temps, la double liaison des alkylidènes cyclobutanols en fonction cétone. Une transposition acide conduit alors à une diénone possédant une structure intéressante et un grand potentiel de fonctionnalisation. Par ailleurs, après bis hydroxylation de la double liaison, les diols obtenus ont pu être transposés dans des conditions de mésylation ou d'oxydation en céto acétates, céto éthers ou enéenones tricycliques possédant des stéréochimies de jonction de cycle variées. Enfin, une étude exploratoire a permis de montrer que la fonctionnalisation des diénones bicycliques était envisageable ; ceci laisse ainsi entrevoir une nouvelle voie d'accès à des précurseurs d'analogues cycliques de prostaglandines
Characterization of lignin thermal processing in a biorefinery perspective by Binod Shrestha( )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

La conversion thermochimique de la lignine est un aspect important de la bioraffinerie lignocellulosique avec pour objectif la production de fibres de carbone, d'additifs polymères, de composés aromatiques verts ou de biocarburants. Dans ce travail, la lignine Protobind 1000 a été caractérisée, dans un premier temps, par thermogravimétrie, calorimétrie, rhéologie in-situ, RMN in-situ du proton, RMN ex-situ du carbone et du phosphore. Plusieurs techniques d'analyses (analyse élémentaire, GPC-UV, FTIR et LDI-FTICRMS) ont été utilisées pour comprendre le ramollissement et la pyrolyse de la lignine et un mécanisme physico-chimique global de conversion thermo-chimique de la lignine a été proposé. Après des études préliminaires de rhéologie in-situ à haute température et en mélangeur interne, l'extrusion de la lignine a été réalisée en utilisant une extrudeuse bi-vis (Process 11). La fenêtre de fonctionnement du procédé a été déterminée à partir de l'étude de l'évolution du couple à différents débits (0.1-0.3 kg.h-1) et vitesse de rotation des vis (300-600 rpm) et pour une température du fourreau fixée à 150 °C. Deux profils de vis ont été par ailleurs étudiés pour évaluer l'impact de l'intensité du mélange sur le ramollissement de la lignine. Les extrudâts de lignine obtenus pour différentes conditions d'extrusion ont été caractérisés par FTIR, GPC-UV/ETCS, et RMN 2D du liquide. Ces analyses ont montré qu'aucun changement structurel majeur ne se produit durant l'extrusion à chaud. Enfin, les interactions entre la lignine et différents solvants (eau, éthanol et soude aqueuse) ont été étudiées par rhéologie in-situ, DLS, mesure du potentiel zêta, SAXS et analyse visuelle en temps réel. La liquéfaction de la lignine a ensuite été effectuée en réacteur fermé dans de l'éthanol et les produits de liquéfaction ont été analysés par absorption et fluorescence UV, spectroscopie UV-Raman et GPC
Etude de nouvelles techniques de dérivation chimique de la lignine en vue de l'analyse par chromatographie d'exclusion stérique by Esakkiammal Sudha Esakkimuthu( )

1 edition published in 2020 in English and held by 1 WorldCat member library worldwide

La lignine, deuxième biopolymère le plus abondant sur Terre, possède une structure aromatique tridimensionnelle hautement ramifiée, porteuse de différents groupements fonctionnels, principalement alcooliques et phénoliques. Le travail de recherche a porté sur les méthodes de dérivation chimique de la lignine permettant de quantifier les hydroxyles et de déterminer les distributions de masses molaires des lignines par chromatographie d'exclusion stérique et multi-détection. Cinq lignines techniques ont été étudiées : Protobind 1000, Organosolv (CIMV), lignine Kraft de pin, lignine Kraft d'Eucalyptus et lignine Indulin. L'acétylation, méthode classique de dérivation des hydroxyles, a été comparée aux nouvelles méthodes de fluoro-dérivation développées durant l'étude (fluorobenzylation et fluorobenzoylation). Les fonctions hydroxyle ont été quantifiées par titrages conductimétriques et potentiométriques, aminolyse-GC, spectrométries IR et UV- différentielle, et spectrométrie RMN (1H, 13C, 19F et 31P). La distribution des masses molaires des lignines dérivées a été déterminée en utilisant différentes colonnes et solvants (DMAc et THF). La méthode d'étalonnage standard, utilisant différents polymères standards de calibration, et la méthode dite “d'étalonnage universel”, utilisant la détection viscosimétrique couplée à la réfractométrie, ont été comparées. La fluoro-dérivation augmente la solubilité de la lignine dans le THF et améliore les résultats chromatographiques. L'étalonnage universel conduit à environ trois fois les valeurs de masses molaires calculées par étalonnage standard
Fractionnement des complexes lignine-polysaccharides issus de différentes biomasses lignocellulosiques par extrusion bi-vis et séparation chromatographique by Assad Mogni( )

1 edition published in 2015 in French and held by 1 WorldCat member library worldwide

The objective of this work is to validate a new way of valuing various agricultural and forestry coproducts. Study was devoted on the separation of lignin and hemicelluloses contained in extracts obtained by twin-screw extrusion. Twin-screw technology has been chosen to evaluate different extraction conditions. Trial conditions have been adopted in order to highlight the influence of mechanical, thermal and chemical effects on the extraction performances for various plant matrices. Efforts have been made to give priority to mild extraction conditions in the interest of preserving the integrity of the extracted polymers and limiting the environmental impact. Thus hydro-thermal extraction tests without chemical solvents were compared to more conventional alkaline extraction to evaluate their efficiency. This identified the most favorable extraction conditions according to the characteristics of each biomass. The extracts, with hemicelluloses and phenolic compounds, were purified with ion exchange and adsorption resins. Work focused on mechanisms fixations characterization with model solutions conditions containing one or several molecules. Kinetic and isotherm were determined for lignin, coumaric acid and ferulic acid. Then, results were compared to results obtained with the extracts. This study allowed to identify the mechanisms involved in the separation of the lignin-carbohydrates complex
Production de bioéthanol à partir d'une biomasse lignocellulosique multi-ressources locale par prétraitement Organosolv et hydrolyse enzymatique by Maarouf Abdou Alio( )

1 edition published in 2020 in French and held by 1 WorldCat member library worldwide

In a context of energy transition and the fight against climate change,2nd generation bioethanol production is recognized as a promising way to reduce our dependence on fossil fuels.The objective of this study is to analyze the feasibility of 2nd generation bioethanol production from a "wood waste" type of wood substrate, consisting of sawdust obtained from a local sawmill. This sawdust is a mixture of four types of softwood species, representative of local species. Chemical analysis of this waste has shown that it contains approximately 70% (g/g) of potential sugar source in the form of cellulose and hemicelluloses exploitable for the production of 2nd generation ethanol by biochemical route, which involves three key stages: a pretreatment stage, an enzymatic or chemical hydrolysis, and finally a fermentation stage. The pretreatment step selected in this work is based on an Organosolv method. This process uses a pure or diluted organic solvent, added with a catalyst to remove lignin while promoting the recovery of cellulose and hemicelluloses and limiting the formation of inhibitors. Lignin as a coproduct of fractionation can be valued elsewhere. Parameters such as the concentration of sulfuric acid (H2SO4) as a catalyst, the ethanol/water ratio in the extraction solvent, the treatment temperature, and the applied pressure were studied to optimize the fractionation of the wood, the yield and the purity of the cellulose, the recovery of the lignin and the absence of formation of inhibitors. For the pretreatment, the optimal conditions obtained experimentally on sawdust are as follows: an ethanol/ water ratio of 60/40 with 0.25% H2SO4 for one hour extraction at 175 °C. These conditions made it possible to eliminate 50% of the lignin while preserving 82 ± 3% of the initial cellulose with a purity of 71 ± 3%. Next, the enzymatic hydrolysis of the pretreated substrate under the optimal conditions by an enzyme cocktail (CellicR© Ctec2, Novozymes, Denmark) at 50 °C with shaking (180 rpm) achieved a conversion of cellulose to glucose of 80% after 12 days. Finally, fermentation of the glucosidic hydrolyzate by a strain of Saccharomyces cerevisiae led to obtaining an alcoholic fermentation yield close to 80% of the theoretical yield, which seems consistent with the absence of inhibiting compounds observed during the fermentation step. Process simulations at the biorefinery scale showed that que 70,088 tons/year of wet biomass could be converted into 11,400 tons/year of ethanol, enhancing water and ethanol savings (4.8 L water per L ethanol, and 99% ethanol recovery, respectively), at the expense of higher energy requitements (10.9 and 8.6 kWh/L ethanol for hot and cold utilities, respectively) than in pretreatments in aqueous phase
Valorisation des marcs de raisins épuisés : vers un procédé d'extraction de tannins condensés à grande échelle pour la production d'adhesifs pour panneaux de particules by François Gambier( )

1 edition published in 2014 in French and held by 1 WorldCat member library worldwide

Wastes from the French wine industry are traditionally treated and upgraded in distilleries. This work deals with the study of an industrial-scale valorization of a final waste from distilleries: the spent grape pomace. Pomace from different French production areas were chemically characterized, in terms of condensed tannins and polysaccharides. An extraction process of condensed tannins has been optimized in laboratory and was then transferred to an industrial scale. Several extractions were carried out in three partner distilleries and chemical analysis (in terms of polyphenols, condensed tannins, sugars and inorganics) of the different isolated fractions were performed. Industrial extracts were used for the elaboration of the first particleboard whose adhesive constituted by 80% of grape pomace tannins and strengthened with a synthetic resin to satisfy the European standard for internal bond. These industrial extracts were also used to partially substitute a phenol-formaldehyde resin for the production of particleboards. Different post-treatments were performed on the pomace extracts in order to increase their chemical reactivity toward cross linking agents. Filtration with a cut-off of 1 µm led to a slight improvement in adhesive performances, whereas acid hydrolysis of the extract have degraded it. An ultrafiltration process of the extracts at 5 kDa or at 1 kDa enabled to get much more reactive extracts and opened up prospects for the production of bio-based adhesives for wood
 
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Audience level: 0.89 (from 0.86 for Acetyl gro ... to 0.97 for Chimie org ...)

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French (24)

English (7)