Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Investigation of Electrochemical Co2 Capture System(Izmir Institute of Technology, 2022) Uzunlar, Erdal; Uzunlar, Erdal; 03.02. Department of Chemical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyFossil fuels have been used as a primary energy source for many years to meet the increasing energy demand since the industrial revolution. Fossil fuels are an important source of carbon that triggers global warming and climate change. To reduce the accumulation of carbon dioxide in the atmosphere, carbon capture has become more important. Conventional carbon capture technology is a thermally regenerated amine-based capture based on monoethanolamine (MEA). In this process, carbon dioxide is captured in an absorption column with the amine solution, and CO2-amine solution is sent to the stripping column, where the solution is heated to release the captured CO2 and regenerate the amine solution. However, an important disadvantage of this process is that it requires high energy for the CO2 release step. Recently, electrochemical CO2 capture process is proposed in the literature to decrease the energy requirement. The aim of this study is to investigate the electrochemical CO2 capture process using homopiperazine (HPZ). Unlike the conventional CO2 capture process, the CO2 release step is performed using an electrochemical cell. In the anode compartment of this electrochemical cell, the formed CO2-amine complexes are converted into amine-metal complexes from which the CO2 is released. The amine-metal complexes are then sent to the cathode, where the complex decomposes and metal deposition occurs. Laboratory-scale studies of the electrochemical capture process using MEA and HPZ as solvent were carried out. In the obtained results, it was found that HPZ has higher CO2 capture capacity and CO2 release rate than MEA and a similar CO2 absorption rate as MEA. In addition, UV-Vis spectra analyses showed that the reaction rate at the anode was much higher than the reaction rate at the cathode for both amines.Master Thesis Electrolyte-Based Simulations of a Laboratory Scale Carbon Dioxide Capture Process(01. Izmir Institute of Technology, 2020) Özdamar, Ateş Batıkan; Uzunlar, Erdal; Özdamar, Ateş Batıkan; Uzunlar, Erdal; 01. Izmir Institute of Technology; 03.02. Department of Chemical Engineering; 03. Faculty of EngineeringThe aim of this thesis is to design and simulate a laboratory-scale CO2 capture system on Aspen Plus. The studied CO2 capture process is a post-combustion CO2 capture process. The commonly employed monoethanolamine (MEA) sorbent is compared with the piperazine (PZ) sorbent in terms of reaction kinetics and energy consumption throughout the study. Three main simulation studies were performed in order to compare MEA and PZ sorbents. First, an absorption column, then an open loop (single pass) process and finally a closed loop (recycle) process were designed and simulated on Aspen Plus. The simulations were carried out at various inlet gas pressures. After designing an absorber column, CO2 loading, temperature, pressure, mole flow, packing details, column height and diameter constraints were determined. As a result of open loop and closed loop processes, the column operations in absorber and stripper columns regarding CO2 reactions and energy consumption were investigated. The results showed that PZ absorbs and releases more CO2, has a faster kinetics, and is more energy efficient compared to MEA in CO2 capture processes.