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Kinetically Investigation of Catalyst Deactivation in Catalytic Reforming Process

Mohadesi, Majid | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40704 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Baghalha, Morteza; Taghikhani, Vahid
  7. Abstract:
  8. Catalytic reforming of naphtha is an important process to convert of low-octane number naphtha into high-octane number gasoline. Deactivation of catalysts, is the major problem for this process. In this study, catalytic reforming unit of Tabriz oil refinery investigated, and Smith’s kinetic model used for modeling. Also, several models presented for activity of catalysts. To find the parameters of presented models, the difference between the calculated and experimental values of outlet temperatures of each bed and aromatics, paraffin and naphthene yields simultaneously must be minimized. Using Genetic Algorithm Toolbox in Matlab software, optimization was performed and results indicated that cocking is the major reason of deactivation of catalysts. Then, the variation of temperature, hydrogen to hydrocarbon ratio, and time effects on products distribution and catalyst activity investigated (using the best model). Increasing of temperature and decreasing of hydrogen to hydrocarbon ratio, although increased amount of production aromatic (equivalent to octane number), but decreased the catalyst activity. Therefore, optimal inlet temperature and hydrogen to hydrocarbon ratio must be determined. The value of H2/HC for this plant was spotted equal to 4.267. So optimal temperature for different feed compositions and times are calculated. This work was time-consuming, so a correlation for optimal temperature presented by using feed composition and time of process. Finally, the variation of catalyst activity and amount of precipitated coke on catalyst with time investigated, and the effect of temperature on catalyst activity studied. The value of precipitate coke increased with time, thereupon the activity of catalysts decreased
  9. Keywords:
  10. Kinetic Model ; Catalyst Deactivation ; Naphta Reforming ; Coking ; Optimal Values

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