Dissertations / Theses on the topic 'Sustainable solvent'
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Dakubo, Francis. "Sustainable Mining - Solving the Problem of Chalcopyrite Treatment/Processing - Leaching, Solvent Extraction & Flotation." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/604862.
Full textDraucker, Laura Christine. "Novel Solvent Systems for the Development of Sustainable Technology." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16188.
Full textOnwukamike, Kelechukwu Nnabuike. "Sustainable cellulose solubilization, regeneration and derivatization in a DBU-CO2 switchable solvent system." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0016/document.
Full textAs the most abundant source of carbon in our planet, without any competition with food or feed supplies, cellulose is a viable alternative to replace the widely used and unsustainable fossil-based polymers. However, the majority of researchers working on this fascinating biopolymer fail to incorporate sustainability considerations during cellulose chemical transformation to make materials. The consequence is a shift of the “environmental burden” to other stages of the process cycle. Therefore, to ensure sustainability, both the renewability feature of cellulose as well as sustainability considerations concerning its transformation processes are necessary. This implies to consider the solvent, the reactants, the derivatization process and the wastes produced as well as an evaluation of the suitability of the resultant products, for which relevant properties have to be obtained to compete with existing alternatives. This thesis is therefore divided into three main parts (solubilization, regeneration and derivatization of cellulose), and addresses the various concerns of sustainability during cellulose transformation with an end-goal of making processable materials.In the first part of the thesis, a sustainable solvent system for cellulose was investigated. In this regard, a detailed optimization study of the DBU-CO2 switchable solvent system was performed using in-situ infrared spectroscopy. Upon optimization, up to 8 wt.% cellulose could be dissolve within 15 min at 30 °C using low CO2 pressure (2-5 bar). What makes this solvent system sustainable, when compared to other classical cellulose solvents, includes: easier recyclability by simple release of the CO2 pressure, fast and mild solubilization and lower cost compared to ionic liquids. Finally, by successfully trapping the formed in-situ cellulose carbonate using an electrophile, a clearer understanding of this solvent system was established.The successful optimization of a sustainable solvent system for cellulose led to the second part of the thesis: the regeneration of cellulose. Here, the general solubilization and coagulation ways followed by freeze-drying was adopted to prepare cellulose aerogels. Various processing conditions such as cellulose concentration, coagulating solvent and super base, were investigated on their effect of the aerogels properties (density, morphology, pore size). The obtained results showed aerogels with densities between 0.05 and 1.2 g/cm3, porosities between 92 and 97 % and pore sizes between 1.1 and 4.5 μm. In addition, from scanning electron microscopy (SEM), open large macroporous inter-connected cellulose networks were observed.The derivatization of cellulose to make thermally processable materials is covered in the third part of the thesis. This part is divided into two sub-parts; transesterification and multicomponent reaction modification. [...]
Als Kohlenstoffquelle mit der größten Verfügbarkeit auf unserem Planeten, ohne Konkurrenz zur Lebens- und Futtermittelversorgung, stellt Cellulose eine interessante Alternative dar, um die vielfältig genutzten, nicht-nachhaltigen Polymere auf Erdölbasis zu ersetzen. Die Mehrheit der Forscher, die mit diesem faszinierenden Biopolymer arbeiten, vernachlässigt allerdings Überlegungen zur Nachhaltigkeit in die chemische Modifizierung von Cellulose bei der Herstellung von Materialien zu integrieren. Die Konsequenz dessen ist eine Verlagerung der Umweltbelastung auf andere Abschnitte des Prozess-Zyklus. Um Nachhaltigkeit sicherzustellen, sind deshalb sowohl der erneuerbare Aspekt von Cellulose als auch Überlegungen zur Nachhaltigkeit im Reaktionsprozess wichtig. Dies beinhaltet die Berücksichtigung des Lösungsmittels, die Reaktanden, des Derivatisierungsprozesses, die produzierten Abfälle sowie eine Beurteilung der Nachhaltigkeit der resultierenden Produkte, die relevante Eigenschaften aufweisen müssen um mit bestehenden Alternativen konkurrieren zu können. Diese Arbeit ist deshalb in drei Teile gegliedert (Löslichkeit, Rückgewinnung und Derivatisierung von Cellulose) und befasst sich mit den verschiedenen Aspekten der Nachhaltigkeit während der Umsetzung von Cellulose mit dem Ziel, verarbeitbare Materialien herzustellen.Im ersten Teil der Arbeit wurde ein nachhaltiges Lösungsmittelsystem für Cellulose untersucht. In diesem Zusammenhang wurde eine detaillierte Optimierungsstudie des DBU-CO2 schaltbaren Lösungsmittelsystems mittels in-situ Infrarot Spektroskopie durchgeführt. Nach der Optimierung konnten bis zu 8 Gew.-% Cellulose innerhalb von 15 min. bei 30°C und einem niedrigen CO2-Druck (2-5 bar) gelöst werden. Verglichen mit klassischen Lösungsmitteln für Cellulose weist dieses Lösungsmittelsystem verschiedene nachhaltige Aspekte auf: Einfaches Recycling durch entfernen des CO2-Drucks, schnelles und mildes Auflösen und geringere Kosten als ionische Flüssigkeiten. Durch erfolgreiches Abfangen des in-situ gebildeten Cellulose-Carbonats mit einem Elektrophil, konnte schließlich ein besseres Verständnis dieses Lösungsmittelsystems erreicht werden. Die erfolgreiche Optimierung eines Lösungsmittelsystems für Cellulose führte zum zweiten Teil der Arbeit: der Regenerierung von Cellulose. Hier wurde der bereits mit anderen Systemen beschriebene Weg von Lösen und Ausfällen, gefolgt von Gefriertrocknen übernommen, um Cellulose-Aerogele herzustellen. Verschiedene Bedingungen bei der Verarbeitung wie die Cellulose-Konzentration, Lösungsmittel zum Ausfällen und die Superbase und deren Effekt auf die Eigenschaften der Aerogele (Dichte, Morphologie und Porengröße) wurden untersucht. So wurden Aerogele mit einer Dichte von 0.05-1.20 g/cm3, Porositäten zwischen 92 und 97% und Porengrößen zwischen 1.1 und 4.5 μm erhalten. Zusätzlich wurden im Rasterelektronenmikroskop offene große und makroporöse, miteinander verbundene Cellulose-Netzwerke beobachtet. [...]
Whitaker, Mariah R. "Design of Heterogeneous Catalysts Incorporating Solvent-Like Surface Functionality for Sustainable Chemical Production." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1563303994362428.
Full textFullarton, Claire. "Working towards a new sustainable rechargeable battery : zinc, conducting polymer and deep eutectic solvent system." Thesis, University of Leicester, 2015. http://hdl.handle.net/2381/31863.
Full textBHANDARI, SHASHANK. "Design of a solvent recovery system in a pharmaceutical manufacturing plant." Thesis, KTH, Skolan för kemivetenskap (CHE), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-190901.
Full textShearouse, William C. "Development and mechanistic understanding of ball milling as a sustainable alternative to traditional synthesis." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1353089340.
Full textZhang, Zhaoxi. "A study of solute-solvent interactions in methanol solutions : potential new sustainable technologies for refinery product upgrading/separating and methanol utilization." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:c01e67d6-ed58-4c7c-8913-00f3e0a6408c.
Full textOnwukamike, Kelechukwu Nnabuike [Verfasser], M. A. R. [Akademischer Betreuer] Meier, and H. [Akademischer Betreuer] Cramail. "Sustainable Cellulose Solubilization, Regeneration and Derivatization in a DBU-CO$_2}$ Switchable Solvent System / Kelechukwu Nnabuike Onwukamike ; Betreuer: M.A.R. Meier, H. Cramail." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1181190525/34.
Full textChagnoleau, Jean-Baptiste. "Extraction de composés naturels à l'aide de solvants durables : expérience et modélisation." Electronic Thesis or Diss., Université Côte d'Azur, 2024. http://www.theses.fr/2024COAZ5023.
Full textNatural plant extracts are valuable ingredients for a wide range of applications, particularly in the cosmetic or pharmaceutical industries or in the perfume or food industries. But the extraction of these natural compounds remains mainly carried out using volatile organic solvents (VOCs) and processes with significant environmental impacts. In the recent context of green chemistry and eco-extraction, sustainable alternative solvents have been developed to replace VOCs. Among these solvents, biobased solvents (BioSol), deep eutectic solvents (DES) and ionic liquids (ILs) have been the subject of intense studies over the last two decades. However, current developments in plant extraction techniques are mainly based on experimental trials, which limits the number of extraction conditions and solvents that can be evaluated. To address this limitation, several modeling tools have been developed to predict solvent properties and support solvent choice. In Chapter I, the sustainability of alternative solvents will be discussed and tools to predict solvent properties will be introduced.In the context of the circular economy and waste recycling, by-products are now considered as an alternative source of natural compounds. In chapter II of this work, the valorization of rejected kiwifruit is proposed by the extraction of bioactive compounds using sustainable solvents, namely deep eutectic solvents (DES). The results show that kiwi peel extracts obtained with carboxylic acid-based DES exhibit improved antioxidant activity compared to conventional solvents.In the field of perfumery or food industries, the extraction techniques currently used have several drawbacks. In chapter III of this work, alternative techniques were studied to propose new fragrance ingredients obtained using sustainable solvents. Extracts of leaves and fruits of pink pepper (Schinus molecular L.) were obtained by solid-liquid extraction and hydrodistillation in aqueous solutions of DES or IL, while extracts of petals of Rosa centifolia were obtained by solid-liquid extraction in BioSol, DES and IL.After extraction from the plants, the natural extracts obtained are complex chemical mixtures. Certain applications requiring the use of pure compounds, several separation techniques have been developed. Centrifugal partition chromatography (CPC) is a separation technique using the two phases of a biphasic system as mobile and stationary phase to perform preparative chromatographic separations. The possibility of using sustainable solvents and in particular DES to form biphasic systems for CPC has been little studied. In Chapter IV of this work, the development of biphasic systems containing DES were investigated as potential systems for separating natural compounds. Finally, the potential of the COSMO-RS model in the design of two-phase systems for the separation of natural compounds was investigated. The results demonstrate that COSMO-RS predicts in most cases the binodal curves of biphasic systems and the partition coefficients of natural compounds with good accuracy. Thus, these results indicate that COSMO-RS can be a powerful tool in the design of separation and purification systems.Overall, this work provides insight into the potential of various sustainable solvents for the extraction and separation of natural compounds
Piovani, Laura. "Study of low environmental coating products: bio-based water products and solvent based products deriving from PET recycling." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Find full textKassner, Michelle Kimberly. "Novel sustainable solvents for bioprocessing applications." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26683.
Full textCommittee Co-Chair: Eckert, Charles; Committee Co-Chair: Liotta, Charles; Committee Member: Bommarius, Andreas; Committee Member: Fernández, Facundo; Committee Member: Lu, Hang. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Hart, Ryan J. "Designing switchable solvents for sustainable process development." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/39631.
Full textVagnoni, Martina <1993>. "CO2 utilization and alternative solvents: effective tools for sustainable applications." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10428/1/CO2%20UTILIZATION%20AND%20ALTERNATIVE%20SOLVENTS%20EFFECTIVE%20TOOLS%20FOR%20SUSTAINABLE%20APPLICATIONS.pdf.
Full textDonaldson, Megan Elizabeth. "Development and application of novel solvents for sustainable reactions and separations." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24749.
Full textCommittee Chair: Charles A. Eckert; Committee Co-Chair: Charles L. Liotta; Committee Member: Christopher W. Jones; Committee Member: Facundo M. Fernandez; Committee Member: Thomas F. Fuller.
Marus, Gregory Alan. "The application of green chemistry and engineering to novel sustainable solvents and processes." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43755.
Full textFord, Jackson Walker. "Designing for sustainability with CO2-tunable solvents." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19866.
Full textCommittee Chair: Dr. Charles A. Eckert; Committee Co-Chair: Dr. Charles L. Liotta; Committee Member: Dr. Amyn Teja; Committee Member: Dr. Dennis W. Hess; Committee Member: Dr. Victor Breedveld.
Wickström, Sofia, and Jessica Danielsson. "Sustainable working capital management : A case study of five successful firms." Thesis, Uppsala universitet, Företagsekonomiska institutionen, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227059.
Full textMedina-Ramos, Wilmarie. "Water and carbon dioxide for sustainable synthesis and separation of pharmaceutical intermediates." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52915.
Full textFadhel, Ali Zuhair. "Designing for sustainability: applications of tunable solvents, switchable solvents, and catalysis to industrial processes." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39646.
Full textPaggiola, Giulia. "Multi-perspective analysis of the applicability of bio-based solvents as sustainable options for biocatalysis." Thesis, University of York, 2016. http://etheses.whiterose.ac.uk/15797/.
Full textZaytseva, K. "Methods of formation scenarios for solving the problems of sustainable development of regions." Thesis, Видавництво СумДУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/26817.
Full textNora, Perk. "Transformation Towards Sustainable Transportation : Solving the "First and Last-mile" Problem in Europe." Thesis, Blekinge Tekniska Högskola, Institutionen för fysisk planering, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-19583.
Full textSong, Ingu. "Role of carbon dioxide in gas expanded liquids for removal of photoresist and etch residue." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/26473.
Full textCommittee Chair: Hess, Dennis; Committee Member: Eckert, Charles; Committee Member: Frazier, Bruno; Committee Member: Henderson, Clifford; Committee Member: Liotta, Charles. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Hunter, Dale. "Facilitation of sustainable co-operative processes in organisations /." View thesis, 2003. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20031107.153926/index.html.
Full text"A thesis presented to the University of Western Sydney School of Social Ecology and Lifelong Learning in fulfilment of the requirements for the degree of Doctor of Philosophy" "March 2003" Bibliography: 238 - 249.
Cong, Yongqing. "Sustainable Public Pension System for Florida Local Governments: Financial Solvency, Paradigm Switch, and Interperiod Equity." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1455.
Full textAda, Ketchie, Nehe Meret, and Shapira Hila. "For the Creative Problem-Solver : An Integrated Process of Design Thinking and Strategic Sustainable Development." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4208.
Full textSilva, Liliana Cristina Vieira da. "Development of a sustainable method for the extraction of lycopene and β-carotene from food wastes." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/15490.
Full textThe main objective of the present work is the study of a profitable process not only in the extraction and selective separation of lycopene and β-carotene, two compounds present in tomato, but also in its potential application to food industry wastes. This is one of the industries that produce larger amounts of wastes, which are rich in high value biomolecules with great economic interest. However, the conventional methods used to extract this kind of compounds are expensive which limits their application at large scale. Lycopene and βcarotene are carotenoids with high commercial value, known for their antioxidant activity and benefits to human health. Their biggest source is tomato, one of the world’s most consumed fruits, reason for which large quantities of waste is produced. This work focuses on the study of diverse solvents with a high potential to extract carotenoids from tomato, as well as the search for more environmentally benign solvents than those currently used to extract lycopene and β-carotene from biomass. Additionally, special attention was paid to the creation of a continuous process that would allow the fractionation of the compounds for further purification. Thus, the present work started with the extraction of both carotenoids using a wide range of solvents, namely, organic solvents, conventional salts, ionic liquids, polymers and surfactants. In this stage, each solvent was evaluated in what regards their capacity of extraction as well as their penetration ability in biomass. The results collected showed that an adequate selection of the solvents may lead to the complete extraction of both carotenoids in one single step, particularly acetone and tetrahydrofuran were the most effective ones. However, the general low penetration capacity of salts, ionic liquids, polymers and surfactants makes these solvents ineffective in the solid-liquid extraction process. As the organic solvents showed the highest capacity to extract lycopene and βcarotene, in particular tetrahydrofuran and acetone, the latter solvent used in the development process of fractionation, using to this by strategic use of solvents. This step was only successfully developed through the manipulation of the solubility of each compound in ethanol and n-hexane. The results confirmed the possibility of fractionating the target compounds using the correct addition order of the solvents. Approximately, 39 % of the β-carotene was dissolved in ethanol and about 64 % of lycopene was dissolved in n-hexane, thus indicating their separation for two different solvents which shows the selective character of the developed process without any prior stage optimization. This study revealed that the use of organic solvents leads to selective extraction of lycopene and β-carotene, allowing diminishing the numerous stages involved in conventional methods. At the end, it was possible to idealize a sustainable and of high industrial relevance integrated process, nevertheless existing the need for additional optimization studies in the future.
O principal objetivo do presente trabalho recai no estudo de um processo eficiente para a extração e fracionamento de licopeno e β-caroteno presentes no tomate, bem como na aplicação do processo a resíduos provenientes da indústria alimentar. Esta é uma das indústrias que produz das maiores quantidades de resíduos ricos em biomoléculas com valor acrescentado e com um elevado potencial económico. No entanto, os métodos convencionais para a extração deste tipo de compostos tornam-se dispendiosos, o que inviabiliza a sua aplicação em larga escala. O licopeno e o β-caroteno são carotenóides com elevado valor comercial, conhecidos pela sua atividade antioxidante e efeitos benéficos para a saúde humana. A sua maior fonte é o tomate, um dos frutos mundialmente mais consumidos, razão pela qual as quantidades de resíduos produzidos são consideráveis. Este trabalho centra-se no desenvolvimento de um processo que permita a extração e fracionamento eficientes destes carotenóides a partir do tomate, considerando o uso de solventes mais benignos que os estudados até ao momento. Adicionalmente, foi igualmente desenvolvido o processo de fracionamento em contínuo, considerando a futura aplicação industrial do mesmo. Assim, iniciou-se o presente trabalho com a extração destes dois carotenóides utilizando um conjunto de solventes comuns e alternativos, nomeadamente, solventes orgânicos, sais convencionais, líquidos iónicos, polímeros e surfatantes. Nesta etapa avaliou-se a capacidade de extração de cada um dos solventes. Os resultados obtidos demonstraram que uma seleção adequada do solvente pode conduzir à extração completa dos dois carotenóides numa única etapa de extração, sendo que a acetona e o tetrahidrofurano se revelaram os mais eficazes, sendo os sais, líquidos iónicos, polímeros e surfatantes pouco eficazes no processo de extração sólido-líquido, pela sua geral baixa capacidade de penetração na biomassa. Após demonstrar a elevada capacidade dos solventes orgânicos na extração do licopeno e β-caroteno, nomeadamente tetrahidrofurano e acetona, este último solvente foi usado no desenvolvimento de processo de fracionamento, recorrendo-se para isso ao uso de solventes estratégicos. Este passo foi desenvolvido com sucesso a partir da manipulação das solubilidades de cada um dos compostos de interesse em etanol e n-hexano. Os resultados obtidos confirmaram a possibilidade de fracionamento dos compostos alvo, pela adição ordenada dos solventes. Cerca de 39% do β-caroteno ficou dissolvido no etanol e cerca de 64% de licopeno encontrava-se dissolvido no n-hexano, indicando assim a sua separação para dois solventes distintos o que demonstra o caráter seletivo do processo desenvolvido, sem qualquer etapa prévia de otimização. Este estudo revelou que a utilização de solventes orgânicos conduz à extração seletiva de licopeno e β-caroteno, permitindo a eliminação de inúmeras etapas descritas pelos métodos convencionais. Por fim, foi possível idealizar e desenvolver um processo integrado sustentável e de relevância industrial.
Hunter, Dale. "Facilitation of sustainable co-operative processes in organisations." Thesis, View thesis, 2003. http://handle.uws.edu.au:8081/1959.7/482.
Full textNixon, Emily Cummings. "Silanes in sustainable synthesis: applications in polymer grafting, carbon dioxide capture, and gold nanoparticle synthesis." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45847.
Full textMario, Benini. "Improving Decision Making in Real-world Applications by Solving Combinatorial Optimization Problems." Doctoral thesis, Università di Siena, 2022. https://hdl.handle.net/11365/1221594.
Full textSacadura, João Arriaga e. Cunha Cabral de. "Consulting to social entrepreneurship initiatives - using business skills to help solve social problems: ERG: a sustainable approach." Master's thesis, NSBE - UNL, 2010. http://hdl.handle.net/10362/10314.
Full textEscolinha de Rugby da Galiza is a Social Entrepreneurship project from Santa Casa da Misericórdia de Cascais that uses an innovative approach to social integrate children from the community of Fim do Mundo. Through the study and analysis of this project, it was identified the need to improve the sustainability approach currently used. A set of proposals were developed to diversify its sources of donations and generate its own revenues in order to guarantee its longterm sustainability.
Boehme, Michelle. "Towards a tripartite partnership for sustainable development in the Rustenburg platinum region / Michelle Boehme." Thesis, North-West University, 2006. http://hdl.handle.net/10394/158.
Full textThesis (Ph.D. (Sociology))--North-West University, Potchefstroom Campus, 2006.
Fournier, Antoine. "Développement de procédés écoresponsables pour la synthèse de solvants et d'organocatalyseurs biosourcés." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCK046/document.
Full textOxazolidinones are promising compounds for industrial applications, but nowadays there is not convenient method to produce them on large scale, because of the use of reactants and metallic catalysts harmful for health and environment. A new synthesis method of these compounds was thus elaborated using aminoalcohols and diethyl carbonate. This reaction is catalysed by a biobased imidazolium hydrogen carbonate which is produced by an electrochemical pathway in order to reduce its impact on the environment.This oxazolidinones synthesis method was then applied to the synthesis of a biobased oxazolidinone. To achieve this, an aminoalcohol synthesis was realised, and its structure was established from reactants that can come from renewable resources. The synthesis pathway was the object of modifications to permit the production of the aminoalcohol on a larger scale in safer conditions.The second thematic of these works is based on ionic liquids, very low volatile liquid salts, commonly used as solvents. These compounds are usually expensive, so, rather than to eliminate them at the end of their use, it is more interesting to recycle them. But their low volatility prevents their recycling by distillation, unlike common organic solvents. So, a first electrochemical method was developed, low energy consuming, permitting the recycling of biobased ionic liquids by the formation of an imidazolium hydrogen carbonate as intermediate. This method was compared with other recycling processes through a preliminary life cycle study.Keywords: oxazolidinone, aminoalcohol, imidazolium, ionic liquid, biobased, recycling, electrochemistry, sustainable development, eco-design, life cycle
George, John H. "Preparing Math Deficient University Students for STEM Achievement and Sustainable Learning." Youngstown State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1369580586.
Full textLindeberg, Anna, Claudia Dina, Håkan Augustsson, and Mariana Vasileva. "Importance of Leadership Competencies for the Transition to Sustainable Healthcare in Sweden." Thesis, Blekinge Tekniska Högskola, Institutionen för strategisk hållbar utveckling, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-20027.
Full textMahram, Mona, and Sadegh Shabnam Marboot. "Environmental impact and toxicity of chemicals used at University College of Borås." Thesis, Högskolan i Borås, Institutionen Ingenjörshögskolan, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-19889.
Full textSpaulding, Jeannette. "Tackling Wicked Problems : The Development of a New Decision-Making Tool, Applied to the Estonian Oil Shale Conundrum." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-226505.
Full textEscárcega, Bobadilla Martha Verónica. "Organometallic compounds and metal nanoparticles as catalysts in low environmental impact solvents." Doctoral thesis, Universitat Rovira i Virgili, 2011. http://hdl.handle.net/10803/9114.
Full textAquesta Tesi s'enfoca en l'ús de mitjans de reacció alternatius i sostenibles, com són els líquids iònics (ILs), el diòxid de carboni supercrític (scCO2) i la barreja de ambdós dissolvents, amb l'objectiu de disminuir l'ús de dissolvents orgànics convencionals i la seva aplicació en els següents processos catalítics: hidrogenació asimètrica, reacció de Suzuki d'acoblament creuat C-C, reacció d'alquilació al·lílica asimètrica i la hidrogenació de arens.
In the last decades, the design of processes in the framework of the sustainable chemistry has been exponentially growing. The constant searching of cleaner processes has led to a lot of effort to obtain higher yields by activation of specific sites, and improving chemo-, regio- and enantio-selectivities, which are crucial from a point of view of an atom economy strategy. In this sense, solvents play a critical role.
This PhD thesis focuses on the use of alternative sustainable reaction media such as ionic liquids (ILs), supercritical carbon dioxide (scCO2) and mixtures of both solvents in different catalytic processes, with the aim of decreasing the use of conventional organic solvents applied in the following catalytic reactions: homogeneous and supported rhodium catalysed asymmetric hydrogenation, biphasic palladium catalysed Suzuki C-C cross-coupling, homogeneous palladium catalysed asymmetric allylic alkylation, and ruthenium and rhodium nanoparticles catalysed arene hydrogenation were tested.
Wigum, Kristin Støren. "Human and ecological problem solving through radical design thinking : Analyses and development of design theory and design framework based on long-term human needs and ecological sustainable principles." Doctoral thesis, Norwegian University of Science and Technology, Department of Product Design, 2004. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-549.
Full textAnderson, Pia. "Miljöetiska perspektiv på offentlig upphandling." Thesis, Uppsala universitet, Teologiska institutionen, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-425822.
Full textMaccaferri, Cristian. "Valorization and recycling of raw materials through a waste management system, case of study Koinonia Community, Lusaka, Zambia." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13571/.
Full textFerreira, Ana Maria da Conceição. "Ionic liquids aqueous solutions as sustainable solvents in separation processes." Doctoral thesis, 2018. http://hdl.handle.net/10773/24094.
Full textEste trabalho compreende o desenvolvimento de solventes e processos de separação sustentáveis, eficientes e rentáveis, através da aplicação de soluções aquosas de líquidos iónicos (LIs). Em particular mostra-se o potencial de soluções aquosas de LIs como solventes alternativos para a extração de compostos de valor acrescentado a partir de biomassa, evitando portanto a utilização de solventes orgânicos voláteis, assim como a sua utilização na formação de sistemas aquosos bifásicos (SAB) como processos de separação. No primeiro conjunto de resultados demonstra-se que soluções aquosas de LIs apresentam uma elevada capacidade para extrair cafeína e hidroximatairesinol (HMR) de borras de café e de nós de abeto da Noruega, respetivamente. O primeiro trabalho nesta vertente mostra a importância do conceito de hidrotropia, atuando como o principal fator responsável pelo elevado desempenho das soluções aquosas de LIs na extração de compostos de valor acrescentado a partir de biomassa, enquanto que o segundo trabalho demonstra a utilização de LIs biocompatíveis, permitindo a utilização direta dos extratos de biomassa em aplicações nutracêuticas e de cosmética. As soluções aquosas de LIs também foram estudadas na criação de SAB reversíveis, como plataformas de separação alternativas, assim como no desenvolvimento de sistemas integrados de reação-separação. As respetivas transições de fase ocorrem por aplicação de estímulos externos, tais como pH e temperatura, e a sua aplicação foi demonstrada na separação de misturas de aminoácidos, e ácidos nucleicos e proteínas. Por fim, demonstra-se a utilização de SAB reversíveis como processos integrados de produção e separação. Os SAB reversíveis obtidos por alterações de pH foram aplicados na produção de hidroximetilfurfural (HMF) a partir de frutose em meio ácido, seguido da sua separação em condições alcalinas (induzindo a formação de duas fases). Por outro lado, e tirando partido da natureza biocompatível dos constituintes dos SAB, estudaram-se SAB reversíveis através da alteração da temperatura em processos biocatalíticos. A reação ocorre em meio homogéneo, catalisada pela lacase, onde pequenas alterações de temperatura induzem a formação de duas fases e a completa separação da enzima do respetivo produto. Estes sistemas permitem também a recuperação e reutilização das fases/constituintes dos SAB, contribuindo para o desenvolvimento de processos sustentáveis. Embora seja ainda necessária investigação adicional sobre a viabilidade destes solventes e sistemas para aplicação em larga escala, os resultados aqui apresentados mostram a relevância de soluções aquosas de LIs como solventes alternativos e no desenvolvimento de processos de separação
Programa Doutoral em Engenharia Química
林躍龍. "From the perspective of sustainable development to discuss Indigenous community of eco-tourist crossfire and solvent-the example of Atayal Tribe Lunpi community, Datong Hsiang, Yilan County." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/6u28km.
Full text佛光大學
公共事務學系
96
Abstract The research of contemporary Taiwanese local development has been showed two topics. One is development of community tour and the other is environment maintenance. Since the 921 earthquake, government highly respected maintenance of ecological for preventing disaster due to voice of ecological conservation was up surging and The World Summit on Sustainable Development has took place in South Africa in 2002, the subject is environment and impoverishment. According to author opinion, the research of sustainable development of aborigine community ecological tour can complement each other between community and environment and help to understand change of Taiwanese community movement development. The essay is base on this subject, Lunpi community, Datong Hsiang, Yilan County as a object and exploration of ecological tour. Author initial investigated as below, from whole perspective and compare with past, aborigine community has been changed these years through community ecological tour. As ecological perspective, aborigine community foster mountains and rivers to preserve ancestors’ residence base on natural right. As economical perspective, show mode of protect fishes with seal streams and sightseeing development. Secondly, author found aborigine have benefits conflict with public for protecting community ecological environment. Aborigine has difficult position when drive community sustainable ecological tour with ecological theory. Surely, different aborigine community will modify development route automatically base on different culture conditions for hold together outward benefits and assist community development. Take Lunpi community for example, it has been established Division of Habitats and Ecosystems in Jiuliao brook firstly, not only protection of ecological interface but also convert structure of community relationship. Secondly, it has been established trakis can let tourists experience aborigine culture. It has been benefited outward network and promoted sustainable development of aborigine community. During process of amendment, let sustainable development of ecological environment of aborigine tribe has been obtained strategies.
Santos, Maria João Martins dos. "Towards solving a robust and sustainable Vehicle Routing Problem with Backhauls." Doctoral thesis, 2020. https://hdl.handle.net/10216/129823.
Full textSantos, Maria João Martins dos. "Towards solving a robust and sustainable Vehicle Routing Problem with Backhauls." Tese, 2020. https://hdl.handle.net/10216/129823.
Full textMara, Setyo Tri Windras, and Setyo Tri Windras Mara. "SOLVING A MULTI-OBJECTIVE SUSTAINABLE LOCATION-ROUTING PROBLEM USING DISCRETE MULTI-OBJECTIVE SINE-COSINE ALGORITHM." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/59r5es.
Full text國立臺灣科技大學
工業管理系
107
The location-routing problem (LRP) is an emerging area in logistics research which combines two well-known distribution planning tasks: facility location problem (FLP) and vehicle routing problem (VRP). The main goal of planning a distribution network is to obtain a minimum systemwide cost, which resembles companies’ economical objective. However, in order to achieve a more sustainable future, nowadays companies have to start to give attention to the sustainability issue, such as providing workload balance for their employees and producing less emission from their operational activities. The challenge arises because sustainability issue is potentially conflicting with companies’ economical objective. Therefore, an effort has to be made to find the optimal solution. Our literature review finds only limited works in LRP which have already addressed sustainability issue comprehensively. Thus, this study intends to present a multi-objective sustainable LRP to address this issue. The proposed model considers three objective functions: (1) to minimize the total cost associated with facility, vehicle, and distribution, (2) to balance the workload in distribution activities, and (3) to minimize CO2 emission from transportation activities. The main purposes of this model are to obtain the optimal location of distribution centers, a number of vehicles established, and delivery routes which satisfy all of these three objectives. In order to solve the model, this study implements a novel metaheuristic for multi-objective routing problem, namely the multi-objective sine-cosine algorithm (MOSCA). The algorithm is modified with a simple discretization technique to deal with discrete search space. Then, the performance of the proposed algorithm is evaluated with several test instances and applied to solve a real world case study in Daerah Istimewa Yogyakarta, Indonesia. The results are compared to three classical metaheuristics, namely non-dominated sorting genetic algorithm-II (NSGA-II), multi-objective particle swarm optimization (MOPSO), and Pareto archived evolution strategy (PAES). The experimental results indicate that, based on five comparison metrics, MOSCA performs better than the other algorithms.
Damabi, Roya Mohebbi Pour. "Problem-solving politics : debt, discourse and the International Monetary Fund." Thesis, 2005. http://hdl.handle.net/10413/2684.
Full textThesis (M.A.)-University of KwaZulu-Natal, Durban, 2005.
Craveiro, Rita Paula Paiva. "Engineering bio-based polymers using alternative solvents and processes." Doctoral thesis, 2015. http://hdl.handle.net/10362/17121.
Full textTai, Kuo-Kuang, and 戴國銧. "How to Perform Sustainable Management and Solve the Problems It Faces – A Distributing Company." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/7svmw2.
Full text國立交通大學
管理學院高階主管管理碩士學程
107
Bio-Med Industry changes for the better day by day, now with AI, IOT Big Data joining, it advances much more at a tremendous pace. Viewing the high speedy growth globally, within recent years Taiwan Bio-Med Industry have grown rapidly with satisfactory results too under the government’s encouragement using antibodies and cell to gradually cure diseases which before taken as uncured. Also, it is effective for earlier detection and curing. Based on the earlier detection of tau-protein, there makes great process. Bio-Med Industry is surely a good weapon to compete with others around the world. If integrating with IT Industry, it will create another new industry, making Taiwan with growth to top. The feature between Bio-Med distributors and normal distributors is different. Besides the normal/basic import/export knowledge, there needs much more professional training and experience, even good after-service to meet with customers’ needs. It is indeed difficult to become a Bio-Med distributor. It is hard to survive under the hard competitions, not to say to become the leading position in the field. The merge between suppliers brings serious harm to the distributors. If having no advanced protection, it is, just as mentioned, easily finished/disappeared. The risk control is a must to big scaled company, such as license, patent application, stand-by products, etc. CSB as well as other companies all think it is a density and inevitable to distributors when distributorship is terminated due to suppliers merged. While, from the course of Managing Strategy given by EMBA professors of National Chiao Tung University, I learn things may not happen like this. Trade Off is quite important, you need to decide which to keep and which to give up (As you saw, so you will reap). CSB’s transformation, with its ready priority, self-developed products, own brand, service center, etc. will be a good innovation. CSB, although lost a lot and delayed the original plan for IPO due to distributorship terminated due to suppliers merged, still fortunately learn its own current constitution. It needs adjust wholly to be realized. Then IPO creates its value. Only with this the sales growth will be not controlled by others, and have big alternation. Accordingly, it can estimate its annual business growth, and conduct IPO with its real meaning and value. Business establishing is not an easy thing, but, to manage continuously is much more difficult in competition. This essay well expresses personal experience of many years in business establishing and mainly - “How a distributing company to perform sustainable management and solve the problems it faces”. Believe it is a worthwhile reference to the new comings.