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Coupling and Optimization of CO2 Capturing and Utilization via Temperature-Vacuum Swing Adsorption (TVSA)Technique

Kashiryfar, Mohammad Ehsan | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57985 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Fotovat, Farzam; Avami, Akram
  7. Abstract:
  8. The increase in the concentration of carbon dioxide in the atmosphere is one of the most important factors of global warming and climate change, which has wide environmental consequences. Reducing the emission of this greenhouse gas is one of the global priorities in protecting the environment and improving air quality. In this research, the process of carbon dioxide absorption from flue gases has been investigated and optimized using the temperature-vacuum swing adsorption method (TVSA). Zeolite 13X adsorbent was used as the main adsorbent in this process and its performance was investigated in different operational conditions. The main goal of this research was to evaluate the efficiency of zeolite 13X in adsorbing carbon dioxide and optimizing the operating conditions to increase the efficiency of the process. Also, the use of adsorbed carbon dioxide for the production of methanol was investigated as a strategy to reduce greenhouse gas emissions and produce alternative fuels. In the simulations performed using Aspen Adsorption and Aspen Plus software, surface adsorption parameters such as adsorption time (15-25 minutes), feed temperature (280-294 K), regeneration temperature (450-370 K) and vacuum pressure (0.2-0.5 bar) on the output functions of the conversion percentage of carbon dioxide and the molarity of methanol in the output stream from the methanol production reactor and the percentage of the amount of carbon dioxide that has not been removed from the system, as well as the utility cost. The results of this research showed that the best point was obtained at the adsorption time of 25 minutes and the feed steam temperature of 280 K, the regeneration temperature of 381.4 K and the vacuum pressure of 0.2 bar. In such conditions, the molar percentage of methanol in the output of the reactor is 5.018%, the conversion percentage of carbon dioxide is 29.423%, the amount of carbon dioxide remaining in the system is 24.1%, and the utility cost is $417/year per ton of methanol
  9. Keywords:
  10. Greenhouse Gases ; Zeolite 13X ; Methanol ; Flue Gas ; Carbon Dioxide Absorption ; Carbon Capture and Storage (CCS)Technology ; Temperature-Vacuum Swing Adsorption (TVSA)Method

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