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Effective Factors in Preventing Green Oil Formation in Chloride Adsorbents

Talebkeikhah, Farzaneh | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50128 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Farhadi, Fathollah
  7. Abstract:
  8. In order to prevent the CCR catalysts from sintering and maintaining their acidity, some chloride compounds are added to these catalysts during regeneration process. The existence of these compounds in downstreams units and equipment causes problems such as corrosion, fouling, etc. Therefor for eliminating these chloride compounds from the exit stream a chloride adsorbent is used. The common compound that is suggested for this application is activated alumina for its high surface area. When Olefin or Aromatics exist in the stream, that is common in many units, a side reaction happens and green oil is formed. In this study, different factors in green oil formation has been studied. Although alumina is known for its acidity surface, adsorption test and FTIR tests has shown that alumina is not effective in green oil formation alone. But when alumina adsorbs hydrogen chloride, it is effective in green oil formation. The Aluminum chloride compound, both the dry and the hydrated one, has been studied too. According to adsorption tests, unlike the dry aluminum chloride, the hydrated one is not effective in green oil formation. Therefor it can be inferred that the existence of water can be effective in controlling the green oil formation. Also by adding metal oxides such as Zinc Oxide the green oil formation can be controlled however when these compounds are added according to BET tests the surface area is reduced and the capacity of chloride adsorption is reduced too
  9. Keywords:
  10. Side Reaction ; Fourier Transform Infra Red (FT-IR)Spectroscopy ; Green Oil ; Active Alumina ; Promoted Alumina

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