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Modeling, Simulation and Optimal Control of Ethylene Polymerization in Non-Isothermal, High-Pressure Tubular Reactors
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Fred Z Yao
Veröffentlicht/Copyright:
23. Juni 2004
Low-density polyethylene (LDPE) is a very important polymer, which is usually produced through a free radical polymerization process in high-pressure tubular reactors. In this study, the mathematical model of this process is developed on the basis of a comprehensive reaction mechanism to accurately determine polymerization rate, and polymer properties under extreme temperature conditions. The model comprises of (i) the mass balances of monomer, initiator, solvent, live radicals and dead polymer chains, and (ii) the energy balances of a tubular LDPE reactor, and its jacket under steady state condition. The model considers the variations in the density and viscosity of reactants along reactor length. Computer simulation of the model is successfully carried out to accurately describe the performance of a non-isothermal, high-pressure, industrial LDPE reactor with multiple initiator injections. Based on the developed non-linear model, the optimal control of the industrial reactor is carried out using genetic algorithms to maximize monomer conversion using jacket temperature as a control function of reactor length. The application of optimal control leads to significant improvements in the final monomer conversion, and capacity utilization of the reactor.
Published Online: 2004-6-23
©2011 Walter de Gruyter GmbH & Co. KG, Berlin/Boston
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Artikel in diesem Heft
- Review
- Industrial Applications of Reactive Distillation: Recent Trends
- Phase Mixing Modeling in Multiphase Reactors Containing Gas Bubble: a Review.
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- Numerical Aspects of Bubble Column Simulations
- Reactor Operating Strategy and Secondary Nucleation in Emulsion Polymerization
- Combined Mechanistic and Empirical Modelling
- The Catalytic Evaluation of Structured Zeolite Catalysts
- A Mechanistic Model for the Water Gas Shift Reaction Over Commercial Catalysts Containing CuO/ZnO
- Catalytic Pyrolysis of Difluorochloromethane to Produce Tetrafluoroethylene
- Radial Profiles of Particle Velocity in a Large Scale CFB Downer
- Nonlinear Dynamic Analysis of the Local Heat Transfer Rate in Three-Phase Reactors
- Conversion of Synthesis Gas into Light Hydrocarbons. Modelling of the Catalytic Reaction Network
- Influence of the Preparation Method and Metal Precursor Compound on Alumina-Supported Pd Catalysts
- A 3D Model of Combustion in Large-Scale Circulating Fluidized Bed Boilers
- Gas and Solid Mixing in High-Density CFB Risers
- A Local Model for Gas-Liquid Mass Transfer in a Gas-Liquid-Solid Circulating Fluidized Bed
- A Hybrid Methodology For On-Line Process Monitoring
- A Laboratory Steam-Cracking Reactor to Characterize Raw Materials
- Modeling, Simulation and Optimal Control of Ethylene Polymerization in Non-Isothermal, High-Pressure Tubular Reactors
- A Parametric Study of the Oxygen Elimination Process in a Packed Bed
- Flow Generated by Radial Flow Impellers: PIV Measurements and CFD Simulations
- Enhanced Reactor Performance with Pressure and Vacuum Swing Reaction
- Characterization and Selection of Materials for Air Biofiltration in Fluidized Beds
- Control and Optimization of a Three Phase Industrial Hydrogenation Reactor
- Horizontal Penetration of Gas-Liquid Spray Jets in Gas-Solid Fluidized Beds
- Optimization of Flow Shear Stress Through a Network of Capillary Fibers With the Use of CFD
- Oxygen Distribution in Packed Bed Membrane Reactors For Partial Oxidation Systems and its Effect On Product Selectivity
- Wastewater Minimisation Using a Heuristic Procedure
- Characterization of Fluidization Quality in Fluidized Beds of Wet Particles
- Numerical and Experimental Investigations into The Effect of Gap Between Baffle and Wall on Mixing in an Oscillatory Baffled Column
- Alternative Designs for Fixed Bed Catalytic Reactors
- Hydrodynamic and Mass Transfer Parameters in Agitated Reactors Part I: Critical Mixing Speed, Induced Gas Flow Rate, and Wavy Surface in SARs and GIRs
- Application of CFD Modelling Technique in Engineering Calculations of Three-Phase Flow Hydrodynamics in a Jet-Loop Reactor
- 3-D Modeling of Liquid Injection into Fluidized Beds
- Conference Presentation
- Granular Flows and Gas Fluidization
- Elastic Granular Flows
- Multi-fluid CFD modelling of fluidised bed reactors
- Chemical Reaction Engineering, the Environment, Pollution Prevention and Sustainable Development
- Gas-Liquid-Solid Fluidization: Perspectives
- Short Communication or Note
- Catalytic Drying of Digested Sludge
- Enhancement of the Distribution of a Liquid Sprayed Into a Fluidized Bed
Schlagwörter für diesen Artikel
kinetics;
polyethylene;
tubular reactor;
optimal control;
genetic algorithms
Artikel in diesem Heft
- Review
- Industrial Applications of Reactive Distillation: Recent Trends
- Phase Mixing Modeling in Multiphase Reactors Containing Gas Bubble: a Review.
- Article
- Numerical Aspects of Bubble Column Simulations
- Reactor Operating Strategy and Secondary Nucleation in Emulsion Polymerization
- Combined Mechanistic and Empirical Modelling
- The Catalytic Evaluation of Structured Zeolite Catalysts
- A Mechanistic Model for the Water Gas Shift Reaction Over Commercial Catalysts Containing CuO/ZnO
- Catalytic Pyrolysis of Difluorochloromethane to Produce Tetrafluoroethylene
- Radial Profiles of Particle Velocity in a Large Scale CFB Downer
- Nonlinear Dynamic Analysis of the Local Heat Transfer Rate in Three-Phase Reactors
- Conversion of Synthesis Gas into Light Hydrocarbons. Modelling of the Catalytic Reaction Network
- Influence of the Preparation Method and Metal Precursor Compound on Alumina-Supported Pd Catalysts
- A 3D Model of Combustion in Large-Scale Circulating Fluidized Bed Boilers
- Gas and Solid Mixing in High-Density CFB Risers
- A Local Model for Gas-Liquid Mass Transfer in a Gas-Liquid-Solid Circulating Fluidized Bed
- A Hybrid Methodology For On-Line Process Monitoring
- A Laboratory Steam-Cracking Reactor to Characterize Raw Materials
- Modeling, Simulation and Optimal Control of Ethylene Polymerization in Non-Isothermal, High-Pressure Tubular Reactors
- A Parametric Study of the Oxygen Elimination Process in a Packed Bed
- Flow Generated by Radial Flow Impellers: PIV Measurements and CFD Simulations
- Enhanced Reactor Performance with Pressure and Vacuum Swing Reaction
- Characterization and Selection of Materials for Air Biofiltration in Fluidized Beds
- Control and Optimization of a Three Phase Industrial Hydrogenation Reactor
- Horizontal Penetration of Gas-Liquid Spray Jets in Gas-Solid Fluidized Beds
- Optimization of Flow Shear Stress Through a Network of Capillary Fibers With the Use of CFD
- Oxygen Distribution in Packed Bed Membrane Reactors For Partial Oxidation Systems and its Effect On Product Selectivity
- Wastewater Minimisation Using a Heuristic Procedure
- Characterization of Fluidization Quality in Fluidized Beds of Wet Particles
- Numerical and Experimental Investigations into The Effect of Gap Between Baffle and Wall on Mixing in an Oscillatory Baffled Column
- Alternative Designs for Fixed Bed Catalytic Reactors
- Hydrodynamic and Mass Transfer Parameters in Agitated Reactors Part I: Critical Mixing Speed, Induced Gas Flow Rate, and Wavy Surface in SARs and GIRs
- Application of CFD Modelling Technique in Engineering Calculations of Three-Phase Flow Hydrodynamics in a Jet-Loop Reactor
- 3-D Modeling of Liquid Injection into Fluidized Beds
- Conference Presentation
- Granular Flows and Gas Fluidization
- Elastic Granular Flows
- Multi-fluid CFD modelling of fluidised bed reactors
- Chemical Reaction Engineering, the Environment, Pollution Prevention and Sustainable Development
- Gas-Liquid-Solid Fluidization: Perspectives
- Short Communication or Note
- Catalytic Drying of Digested Sludge
- Enhancement of the Distribution of a Liquid Sprayed Into a Fluidized Bed
