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Design and Optimization of Nitrogen Purification Unit based on Adsorption

Sarkhoosh Solooklooei, Ali | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56671 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Mousavi, Abbas; Fakhroleslam, Mohammad
  7. Abstract:
  8. In this project, in search of localization and synthesis of adsorbent for nitrogen purification in Pressure Swing Adsorption (PSA) units, studies have been carried out where after the finalized analysis around the choice of the adsorbent for synthesis and unit design, CMS has been choosen. Despite the lower selectivity compared to zeolite adsorbents in absorbing and separating oxygen from nitrogen, this adsorbent has been used as the first adsorbent in the industrial gas production industry due to higher nitrogen recovery and lower nitrogen absorption after economic studies in this field. In these days you can find few companies that use zeolite adsorbents to make nitrogen generators. Therefore, at the beginning of this project, we are looking for the synthesis of this adsorbent, and since the synthesis process of this adsorbent has two stages, the first stage includes the synthesis of active carbon and the second stage is the modification of Activated Carbon and the conversion of active carbon to Carbon Molecular Sieve, the first stage of this process is negelected, because the raw material is produced inside the country in some adsorbent manufacturing companies. Therefore, following the modification of this material due to the high costs of the synthesis of this material by means of the methods mentioned in various articles such as the method of chemical vapor deposition, in search of finding a new and less expensive method, we reached a method based on pyrolysis, which In this method, we used a secondary material to help modify the adsorbent and reduce the dimensions of the substrate cavities and convert as many macro and meso pores as possible to nano in order to increase the adsorption capacity of the adsorbent. As a result of this research, the studied parameter, which had not been investigated until now, is the amount of polymer material used in the solution to modify the adsorbent and in 4 different concentrations we showed the effect of this parameter on the adsorbent performance in different process tests. Finally, after achieving the best possible conditions in the synthesis and preparation of the material, we analyzed the sample data with the best performance and structure, in the process simulation with the help of Aspen Adsim software to find the most optimal operating unit. We may achieve in nitrogen purification that the results of each of the synthesis and design sections of this unit will be explained in full in the coming chapters
  9. Keywords:
  10. Dynamic Simulation ; Pressure Swing Absorption ; Process Optimization ; Aspen HYSYS Software ; Molecular Screens ; Adsorption ; Adsorbent Modification

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