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Mathematical Modeling of Fixed bed Reactor for Oxidative Dehydrogenation (ODH) Process of Light Paraffins

Darvishi, Ali | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44840 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): khorashe, Farhad
  7. Abstract:
  8. An industrial scale reactor for light olefinsproduction was modelledusing the oxidative dehydrogenation (ODH) of light paraffinsin a multi-tubular reactor system involving 10000 small diameter tubes immersed in a shell with proper liquid-cooled flows. Here a theory-based pseudo-homogeneous 1-D model describing the operation of a fixed bed reactor for the ODHparaffinstoolefins over a Ni-Nb-O mixed oxide catalyst (for ethane) and over a V2O5/γ-Al2O3catalyst (for Propane),was employed. The paraffin and oxygen conversions, gas process and coolant temperatures, as well as other parameters affecting the reactor performance, including pressure, were examined. Furthermore, the applied model showed that a multi-tubular reactor with multi-point injection scheme was superior to a single-bed design due to the increased olefinsselectivity while operating under lower oxygen partial pressures resulting in the ethane conversion of about 21.49% and the ethane conversion of about 37.76%.Ultimately, the use of a distributed oxygen feed with limited number of injection points indicated a significant improvement on the reactor performance in terms of paraffinsconversion and olefinsselectivity. This concept also overcame the reactor runaway temperature problem and enabled operations over a wider range of conditions to obtain enhanced olefinsproduction
  9. Keywords:
  10. Mathematical Modeling ; Optimization ; Fixed Bed Reactor ; Oxidative Dehydrogenation ; Light Paraffins ; Mixed Oxide

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