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Survey and synthesis of zeolite adsorbents in Olefins and Paraffinssorption

Taghavi Golsefidi, Abbas | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42758 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Soltanieh, Mohammad
  7. Abstract:
  8. Olefin/ paraffin separation is one of the most important processes in the petrochemical industries.In the last decades, adsorption and membrane processes are a new technology considered significantly for this purpose. In order to synthesizeof zeolite powder (pure silica zeolite STT and CHA), raw materials were made by two methods and their HNMR spectrum was recorded and thenzeolite powder was synthesized. X ray diffraction(XRD) and scanning electron microscopy (SEM) images were taken,showing the same results as the refference structure.To consider synthesized zeolite powdersand olefin/ paraffin interactions, surface adsorption ofthose gases was accomplished on two zeolite powders. After experimental works, three models namely Langmuir, Freundlich, and Langmuir-Freundlich(Sips) were adopted for experimentaldata in three temperatures 26, 40, and 60℃. Langmuir-Freundlich isotherm model with regression coefficient (R2) larger than 99% was found as the recommended model for this adsorption system. In all temperatures, the amount of gases adsorbed on CHA and STTare as followed C3H6> C2H6>C2H4, C3H6> C2H4 > C2H6, respectively.Alumina support discs were utilized to form a microporous membrane layer.Then, by using gained zeolite powders the alumina support disc was seeded. Seeded supports were immersed in the synthesized gel and zeolite layer were growed using the secondary growth method repeated three times till the adjective membrane was made. Finally, SEM images of the support surface proved that a zeolite membrane was made
  9. Keywords:
  10. Zeolite ; Adsorption ; CHA Zeolite ; STT Zeolite ; Lanmuir-Freundlich Model

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