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Kinetic Modeling of Thermal Hydrocracking of a Paraffinic Feedstock

Hajian, Hossein | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41216 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Khorasheh, Farhad; Badakhshan, Amir
  7. Abstract:
  8. Hydrocracking is a hydrogen addition process that permits refineries to convert heavier, less expensive crudes, into highly-valued transportation fuels such as gasoline, kerosene and diesel. Development of an accurate kinetic model for hydrocracking reactions is crucial to correctly predict the detailed product distribution under different operating conditions for a range of feedstocks as well as for reactor design, process optimization and catalyst selection. In this thesis a mechanistic kinetic model was developed for thermal hydrocracking of a paraffinic feedstock. This model was based on a molecular approach that was able to capture the fundamental chemistry of hydrocracking process. To validate the model, product distributions from hydrocracking of the feed were determined from the reaction of a set of representative molecules and were compared with available experimental data. These molecules were constructed using a structural group analysis approach. The reaction network for hydrocracking of the representative molecules was obtained from a free radical mechanism. The governing differential equation of the plug flow reactor was expressed for each representative molecule. A computer program was coded in Matlab and the adjustable kinetic parameters of the model (four in total) were obtained using the Levenberg-Marquardt optimization algorithm. Comparison of experimental and predicted product distributions indicated that the model was successful in predicting the products from hydrocracking reactions
  9. Keywords:
  10. Hydrocracking ; Kinetics Modeling ; Mechanistic Kinetic Model ; Product Distribustion ; Paraffinic Feed Stook

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