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Modeling and Predictive Control of Vinyl Acetate Polymerization in Semi-batch Reactor

Najafi, Maysam | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41116 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shahrokhi, Mohammad
  7. Abstract:
  8. Obtaining polymers with desired properties is very important from industrial point of view. Weight average molecular weight and polydispersity are two important polymer properties. It is also important to obtain a high monomer conversion. In this thesis production of polyvinyl acetate is considered. Under special conditions, the vinyl acetate reactor dynamics become oscillatory which makes the reactor control difficult. For obtaining polymer with desired properties, an objective function which includes weight average molecular weight, polydispersity and monomer conversion has been defined. Then by minimizing this objective function the optimal temperature trajectory is obtained. In this thesis the optimal temperature trajectory is controlled by manipulating the inlet temperature of cold fluid entering the reactor jacket. Because of nonlinear nature of polymerization reactor, the strategy of model predictive control is considered. For this purpose, the block oriented Hammerstein model is used. Performances of model predictive control and PI control are compared. Simulation results show the effectiveness of the proposed control strategy
  9. Keywords:
  10. Polyvinylacetate ; Predictive Control ; Oscillating Flow ; Semi-Batch Reactor ; Optimal Temperature Trajectory ; Block Oriented Hammerstein Model

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