Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Chemical Recycling"”.
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Kinetic modeling frameworks for the chemical recycling of polyolefins
… have been recycled. However, current mechanical recycling cannot solve the issue that material properties will degrade during the recycling process. Chemical recycling offers new pathways by converting polymers back into valuable molecules selectively, but the underlying reactions are extremely …
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Advanced Process Design and Modeling Methods for Sustainable and Energy Efficient Processes
Chemical engineering, as a discipline, uses knowledge of chemistry, thermodynamics, and transport to process and refine resources on a global scale. The chemical processing industry has an enormous impact on global energy consumption and contributes to climate change. Chemical engineers play a …
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Utilization of thermal plasma for conversion of thermoplastic waste to oil products in a pyrolysis reaction
Chemical recycling of waste plastics has gained attention in last decade with nearly 170 million tonnes of deposited waste plastics annually. A chemical process known as pyrolysis converts thermoplastic waste to oil products. In this research work, direct current thermal plasma is designed and used …
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Material flow analysis of plastic in Iceland : moving towards a circular economy
… for plastic is to ensure proper country-wide recycling and reuse strategies are in place that using only renewable energy resources. The current state of circularity for plastic is roughly 6.3% for Iceland. With the new European Commission legislation and the introduction of fee restrictions …
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Selective deconstruction of polyethylene to propylene via isomerization/metathesis and 1-hexene isomerization studies
… a significant environmental challenge due to its chemical inertness and resistance to degradation. Traditional recycling approaches—mechanical recycling and incineration—fail to offer selective, and circular solutions for effective PE waste management. This thesis explores an alternative strategy …
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Self-amplifying degradable polyurethanes and their upcycling application
… attracted considerable attention. For example, chemical recycling methods such as glycolysis can recover the starting polyol for further polymerization. However, most of the chemical recycling methods that have been reported require a large amount of energy. Thus, the development of new …
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Advancing plastics reutilization via catalytic hydroconversion
… must be developed for managing plastics waste. Chemical recycling is an attractive alternative to reutilizing polyolefins by converting them into valuable chemicals and fuels. Hydroconversion processes, including hydrocracking and hydrogenolysis, are promising for chemical recycling polyolefins …
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Bringing photodegradation of plastic waste into the “green age” through off-grid sustainable energy
… despite the current efforts in physical and chemical recycling. Moreover, the faster turnover rate on electronic devices by all consumers continues to increase the generation of plastic waste; consequently, the pollution generated also increases worldwide. Despite breakthroughs that have been …
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Reducing the Environmental Impact of Wind Turbine Blades
… EoL option is life extension; mechanical recycling is the current ‘optimal’ recycling option; chemical recycling will be the ‘optimal’ option for the future. Future research is suggested as aiming to improve the performance of recycled fibre or to reduce the energy consumption of recycling …
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Polymeric Melodies: Polyetherimide Modification-Based Acoustic Membranes and Sonochemical Degradation of Polystyrene
… to the generation of nanocomposites, effective chemical recycling of waste plastics has become paramount to solving the current pollution crisis. While most see discarded plastic as waste with no inherent value, the modern chemist sees a feedstock waiting to be mined for the valuable moieties …
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Co-gasification of biomass and plastic waste in a bubbling fluidized bed reactor
… considered one of the most promising methods of chemical recycling that targets the production of syngas (hydrogen and carbon monoxide) and light hydrocarbon gases. In this study, the gasification of pure birch sawdust wood (BSD) and pure rice husk (RH) was compared with mixtures where each BSD …
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Synthesis of Functionalized Sustainable Polyesters via Controlled Ring-opening Polymerization of O-carboxyanhydrides
… to the polymerization, a two-step facile chemical recycling strategy for poly(α-hydroxy acids) was developed to achieve closed-loop life cycles (Chapter 3). Moreover, this synthetic strategy is not limited to preparing homopolymers and block copolymers but also to producing stereoblock and …
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Geochemistry of the Northern Izu-Bonin arc: implications for crustal recycling and mantle processes
The aim of this study is to better understand chemical recycling at destructive plate boundaries.<br/>Isotopic, major and trace element data of lavas sampled at varying distances from the trench in<br/>the Izu-Bonin arc provide constraints on the different types of flux that influence subduction …
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GREEN METHODS BASED ON ECO-FRIENDLY LIXIVIANTS FOR CRITI-CAL METAL RECOVERY FROM TUNGSTEN INDUSTRIAL SCRAPS
This PhD thesis aims to develop new recycling methods for the recovery of critical metals from hard metal (HM) wastes, based on the use of functional and eco-friendly organic ac-ids in a hydro- or solvometallurgical leaching system. The thesis is presented as a collection of research products (3 …
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Environmental Sustainability ofBIOPLASTICS
… the analysis of the existing data coming from chemical recycling plant (one of the possible end of life scenarios). It has to be mentioned that one of the most widespread biopolymer used in the market is the Polylactic acid (PLA): most of the information and data used in this study are referred …
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A life cycle-based investigation into the potential of a circular and low-carbon plastics economy in South Africa
… objectives and include increased mechanical recycling, the shift from single-use consumption to reuse, and decarbonisation of the sector by integrating renewable energy into the electricity mix as well as replacement of the fossil fuel feedstock for monomer production. Furthermore, the …