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Modeling and Control of Polyethylene Terephthalate Production Reactor

Hedayatnasab, Negin | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44428 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shahrokhi, Mohammad
  7. Abstract:
  8. Polyethylene terephthalate (PET) is known as the most important polyester in the world. This polymer is the raw material for synthetic fibers, films and plastic objects and widely used in textiles and food industry. In this project transesterification and polycondensation reactors of a semi-batch process with dimethyl terephthalate/ethylene glycol feedare simulated. First simulations areperformed for reactors in the laboratory scale.Then the reactors are scaled up to industrial scale in order to produce 100 tons per year of PET product. The optimal temperature trajectory for the fisrt reactor is obtained based on a performance index. This performance index includes the reaction time and considers constraints regarding minimization of the undesired side products and operation limitations. For two reactors, a heating/cooling system is designed. This system contains an electrical heater and a cooling jacket. For the reactors in industrial scale the electrical heater has been replaced by a steam heating system. Performances of GPC and PI controllersfor controlling both reactors temperature are compared. Simulation results indicate that the performance of GPC is slightly better than that of PI controller
  9. Keywords:
  10. Polyethylene Terephthalate ; Simulation ; Control ; Transesterification Reaction ; Polycondensation ; Generalized Predictive Control

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