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Mathematical Modeling of Fluidized-Bed Reactor for Dehydrogenation of Propane (ODHP)

Torabi, Ali | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46814 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kazemeini, Mohammad; Baghghalha, Morteza
  7. Abstract:
  8. In this research, a mathematical model was developed to simulate a two-phase fluidized bed reactor for oxidative dehydrogenation of propane to propylene. Since the assumption of minimum fluidization condition for the emulsion phase is not realistic , the hydrodynamic structure proposed by Cui et al. was used in this study. The mass balances in unsteady state was obtained in a control volume. The differential equations contain three terms, corresponding to the mass transfer by convection, the exchange between phases and the reaction. All differential equations based upon material balances, hydrodynamics and kinetics for all components were solved numerically using MATLAB software 2010a. The resulting equations were solved numerically by a partial substitution finite difference method using appropriate initial and boundary conditions. For model validation, simulation results were compared with previously published results for the simulation of the base case at the exit of the circulating fluidized bed reactor. The percentages of relative error for conversion, selectivity and yield were 0.21, 13.65 and 13.45, respectively. Changing one parameter of the base case was performed each time while keeping the other parameters constant in order to carry out the sensitivity study. The effects of changing temperature, pressure, feed composition and superficial gas velocity were studied. The following conclusions were made. Increasing temperature, pressure and feed concentrations increase the conversion and the yield and decrease the selectivity. The effect of superficial velocity is not significant. The model was compared with two models, two phase simple model and a three phase model, for Geldart B particles. The conversion of our model was the lowest. The conversion of two phase simple model and three phase model were the same
  9. Keywords:
  10. Mathematical Modeling ; Oxidative Dehydrogenation ; Fluidized Bed Reactor ; Propane

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