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Rozprawy doktorskie na temat "Opérations de recyclage (génie chimique) – Environnement"
Schrijvers, Dieuwertje. "Evaluation environnementale des options de recyclage selon la méthodologie d’analyse de cycle de vie : établissement d’une approche cohérente appliquée aux études de cas de l’industrie chimique". Electronic Thesis or Diss., Bordeaux, 2017. http://www.theses.fr/2017BORD0555.
Pełny tekst źródłaModeling of recycling – and allocation in general – is a heavily debated topic in the Life Cycle Assessment (LCA) domain. This thesis aimed to find a coherent scientific approach to model recycling in LCA that provides relevant information to companies. Existing allocation procedures are captured by mathematical formulas and linked to an LCA goal and an attributional or consequential approach in a systematic framework. A review of official guidelines showed that none of them provides recommendations on allocation that is consistent with this framework. A partitioning approach was identified for attributional LCA (a-LCA). This approach is based on subjective assumptions, which are made explicit by axioms. In consequential LCA (c-LCA), the market-price ratio between the recycled and substituted primary material is introduced as a new indicator to identify whether additional recycling substitutes the production of primary materials or avoids waste treatment. The processes that are affected by a changing demand for a product are identified by a causal loop diagram, which also includes stockpiling as a new element in c-LCA. The application of the allocation procedures is demonstrated by a case study of the recycling of rare earth elements (REEs) from used fluorescent lamps. The a-LCA indicated that recycled REEs are more sustainable than primary REEs. The c-LCA showed that recycling is environmentally beneficial as long as the REEs are used in fluorescent lamps that substitute less energy-efficient halogen lamps. This demonstrates that both LCA approaches provide different but useful information for companies. Suggestions are given for policy measures when the market situation does not stimulate environmentally beneficial behavior. It is recommended, among other options, to extend the causal loop diagram of c-LCA to include additional mechanisms, such as rebound effects
Schrijvers, Dieuwertje. "Evaluation environnementale des options de recyclage selon la méthodologie d’analyse de cycle de vie : établissement d’une approche cohérente appliquée aux études de cas de l’industrie chimique". Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0555/document.
Pełny tekst źródłaModeling of recycling – and allocation in general – is a heavily debated topic in the Life Cycle Assessment (LCA) domain. This thesis aimed to find a coherent scientific approach to model recycling in LCA that provides relevant information to companies. Existing allocation procedures are captured by mathematical formulas and linked to an LCA goal and an attributional or consequential approach in a systematic framework. A review of official guidelines showed that none of them provides recommendations on allocation that is consistent with this framework. A partitioning approach was identified for attributional LCA (a-LCA). This approach is based on subjective assumptions, which are made explicit by axioms. In consequential LCA (c-LCA), the market-price ratio between the recycled and substituted primary material is introduced as a new indicator to identify whether additional recycling substitutes the production of primary materials or avoids waste treatment. The processes that are affected by a changing demand for a product are identified by a causal loop diagram, which also includes stockpiling as a new element in c-LCA. The application of the allocation procedures is demonstrated by a case study of the recycling of rare earth elements (REEs) from used fluorescent lamps. The a-LCA indicated that recycled REEs are more sustainable than primary REEs. The c-LCA showed that recycling is environmentally beneficial as long as the REEs are used in fluorescent lamps that substitute less energy-efficient halogen lamps. This demonstrates that both LCA approaches provide different but useful information for companies. Suggestions are given for policy measures when the market situation does not stimulate environmentally beneficial behavior. It is recommended, among other options, to extend the causal loop diagram of c-LCA to include additional mechanisms, such as rebound effects
Jamali, Nadia. "Environmental assessment tools for sustainable resource management". Thesis, Nantes, Ecole des Mines, 2014. http://www.theses.fr/2014EMNA0179/document.
Pełny tekst źródłaIn 1987, the United Nations World Commission on Environment and Development defined sustainable development as ‘‘development that meets the needs of the present without compromising the ability of future generations to meet their own needs’’. The aim is to continuously improve the quality of life for both current and future generation without increasing the use of natural resources beyond the Earth's carrying capacity. The entire life-cycle of natural resources, from their extraction to their final disposal as waste, engenders negative environmental impacts. Waste recycling and the substitutionof excessively polluting resources with alternatives are considered as the key components of sustainable resource management. The flow of the thesis is formalized in the following three research questions:RQ1: Is it possible, and if so how, to assess the environmental impacts resulting from the exploitation of mineral resources, taking into account their abundance, their chemical and physical properties and the effects of their extraction?RQ2: Is it possible, and if so how, to evaluate the environmental performance of recycling, taking into account the chemical, physical and thermodynamic limits of the process?RQ3: To which extent a partial or complete substitution of fossil fuels with biomass is an environmentally friendly solution?The work is essentially based on the emergy approach, but also other environmental assessment tools has been used such as the exergoecology approach, the exergetic life cycle assessment and the carbon footprint. The specific emergy of about 42 main commercially used minerals has been calculated, respecting the material hierarchy developed by Odum. The environmental performance of metallurgical recycling has been studied, taking into account for the material and quality losses during the process. The use of an average transformity is proposed and three sustainability ratios have been defined to assess the benefits and limits of recycling processes. Finally, in order to determine the environmental impact of using biomass as substitute for fossil fuels, two concrete examples has been studied
Saint-Loup, René. "Recyclage chimique du poly(éthylène téréphtalate). Application à la synthèse d'élastomères thermoplastiques". Montpellier 2, 2002. http://www.theses.fr/2002MON20168.
Pełny tekst źródłaRiou, Fabienne. "Procédé de traitement des déchets de circuits imprimés : valorisation par dépolymérisation chimique". Châtenay-Malabry, Ecole centrale de Paris, 2003. http://www.theses.fr/2003ECAP0906.
Pełny tekst źródłaPardal, Francis. "Etude de la réactivité des couples solvolysant-polymère dans les réactions d'alcoolyse des polyesters". Châtenay-Malabry, Ecole centrale de Paris, 2005. http://www.theses.fr/2005ECAP0987.
Pełny tekst źródłaThe object of this work was a better comprehension of the reactivities in alcoholysis reactions of polyesters. For this purpose, we developed an experimental device allowing the isothermal kinetic follow-up of solvolysis reactions. The glycolysis of the PET being revealed more complex than envisaged we have limited the study to glycols as solvolysants and mainly PET as polyester. The studied parameters are: temperature, catalysis, granulometry, nature of glycols, nature and initial crystallinity of polyester. The obtained results showed a strong influence of the experimental conditions (temperature and catalysis) on the evolution of the reactional mixture during depolymerization. The glycols reactivity order depends of temperature and catalysis conditions. Schematically, the total reactivity does not depend only of the glycol chemical reactivity but also on the polarity mixture. The non-catalyzed glycolysis of model polyester by the dipropylene glycol showed surprising results because big differences of reactivity can be observed according to the nature of the glycolic unity for these polyesters
Elghazzaoui, Hanane. "Contribution à l’étude de la dégradation des composites carbone/époxy par solvolyse dans l’eau subcritique et supercritique en vue de leur recyclage". Nantes, 2012. http://www.theses.fr/2012NANT2111.
Pełny tekst źródłaThe solvolysis process at high temperature and high pressure is a new technology that was used in this work to study the recyclability of two composite materials. A study of the physicochemical phenomena involved in this process of degradation and their relationship to the characteristics of each material contributed significantly to the control of the process. First optimization of experimental conditions degradation of two epoxy resins and the thermal analysis of the nature of each process were studied for the first time for this class of materials. Then, the physicochemical and mechanical processes of the different effluents were completed. Finally, ways of valuing different effluent were explored and discussed
Cayuela, Julien. "Synthèse de copolèmères séquencés polycarbonate - poly(ε-caprolactone) à architecture contrôlée par polymérisation de l'ε-caprolactone en présence de Poly(carbonate de bisphénol A) au cours d'une opération d'extrusion". Lyon 1, 2006. http://www.theses.fr/2006LYO10014.
Pełny tekst źródłaGaab, Manuela. "Second generation Trisoxazolines : new polydentate and recyclable dendritic ligands for asymmetric catalysis". Strasbourg, 2009. https://publication-theses.unistra.fr/public/theses_doctorat/2009/GAAB_Manuela_2009.pdf.
Pełny tekst źródłaIn this work, directed towards more efficient and broadened applications of tris(oxazolinyl)ethanes (trisoxazolines) in asymmetric Lewis acid catalysis, a library of new stereodirecting polydentate and linker-functionalised ligands was designed. On the basis of a multigramm-scale access to appropriately functionalised α-amino alcoholprecursors, three C1-chiral pentadentate and two C3-symmetric hexadentate trisoxazoline derivatives, incorporating peripheral (thio)ether functions, were synthesised. Conferring greater kinetic persistence to labile metals such as lanthanides, they are assumed to allow efficient applications in stereoselective transformations. Bis- and trisoxazolines containing an alkynyl unit have been covalently attached to carbosilane dendrimers and the general catalytic potential of their CuII-complexes was assessed by studying two benchmark reactions. For both of them, the bisoxazoline-based multisite catalysts displayed superior selectivity and, in particular, catalyst activity. The latter was interpreted as being due to the hindered decoordination of the third oxazoline unit, the key step in the generation of the active catalyst, in the immobilised trisoxazolinecopper complexes. Second generation dendrimer catalysts were immobilised in dialysis membrane bags, allowing to effect catalytic conversions by dipping them into substrate-filled reaction vessels. The bisoxazoline-based catalysts gave good and reproducible results after several recyclings, whereas the performance of the trisoxazoline dendrimers decreased monotonically due to their low activity, which necessitated an increased reaction time for each cycle. This resulted in higher levels of catalyst leaching
Im Rahmen dieser Arbeit wurde, mit dem Ziel Tris(oxazolinyl)ethanderivate (Trisoxazoline) in der asymmetrischen Lewissäure-Katalyse effizienter und breiter anzuwenden, eine Serie neuer polydentater und Linker-funktionalisierter Steuerliganden synthetisiert. Basierend auf einem Zugang zu entsprechend funktionalisierten α-Aminoalkoholvorstufen im Multigramm-Maßstab wurden drei C1-chirale pentadentate und zwei C3-symmetrische hexadentate Trisoxazolinderivate mit peripheren (Thio)etherfunktionen synthetisiert. Diese tragen im Prinzip zur kinetischen Stabilisierung labiler Metalle, z. B. Der Lanthanoiden, bei und ermöglichen so deren effiziente Anwendung in stereoselektiven Reaktionen. Nach der kovalenten Trägerung Alkinyl-funktionalisierter Bis- und Trisoxazoline an Carbosilandenrimeren wurde das katalytische Potential ihrer CuII-Komplexe in zwei Benchmarkreaktionen abgeschätzt. Bisoxazolin-basierte Vielzentrenkatalysatoren erzielten mit beiden Systemen höhere Selektivitäten und insbesondere Aktivitäten als ihre Trisoxazolinanaloga. Dies wurde auf die gehinderte Dekoordination des dritten Oxazolins, dem Schlüsselschritt bei der Ausbildung des aktiven Katalysators im Falle der immobilisierten Trisoxazolin-Kupferkomplexe, zurückgeführt. Dendritische Katalysatoren der zweiten Generation wurden in einer Dialysemembran immobilisiert, um durch Eintauchen der resultierenden Beutel in mit Substrat befüllte Reaktionsgefäße katalytische Umsetzungen durchzuführen. Dabei erzielten die Bisoxazolinbasierten Katalysatoren über mehrere Läufe gute, reproduzierbare Werte, während jene der Trisoxazolindendrimere monoton abnahmen. Dies ließ sich auf ihre geringe Aktivität, die damit verbundenen längeren Reaktionszeiten und die erhöhten Katalysatorverluste durch Leaching zurückführen
El, Gersifi Khalid. "Recyclage de tubes en matériaux composites fibres de verre utilisés dans les centrales de production d'électricité". Châtenay-Malabry, Ecole centrale de Paris, 2002. http://www.theses.fr/2002ECAP0853.
Pełny tekst źródłaKsiążki na temat "Opérations de recyclage (génie chimique) – Environnement"
Ontario. Esquisse de cours 12e année: Environnement et gestion des ressources cgr4e cours préemploi. Vanier, Ont: CFORP, 2002.
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Znajdź pełny tekst źródłaOntario. Esquisse de cours 12e année: Mathématiques de la technologie au collège mct4c cours précollégial. Vanier, Ont: CFORP, 2002.
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Znajdź pełny tekst źródłaOntario. Esquisse de cours 12e année: English eae4e cours préemploi. Vanier, Ont: CFORP, 2002.
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Znajdź pełny tekst źródłaOntario. Esquisse de cours 12e année: Histoire de l'Occident et du monde chy4c cours précollégial. Vanier, Ont: CFORP, 2002.
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