Mohammad Banaei

Predictive Modeling of Polyolefin Reactors

 

Introduction

Polyolefins are one of the major sources of plastic production and the annual worldwide production of these resins was approximately 100 million metric tons in 2005(Kissin (2005)). Polyolefins can be produced via different production methods, however the gas-solid polymerization process is the most wide spread method for their production. Despite of good heat transfer characteristics of this type of gas-solid contactors, the main limitation in these processes is related to heat transfer phenomena. Reactions of polyolefin formation are highly exothermic and if the produced heat is not removed very well, hot-spots will form and catalyst particles may stick together. Consequently, they may form agglomerates. In the extreme case, agglomerates stick to the distributor of the bed and it will cause a sudden high pressure drop over the bed. In this situation, the process will be defluidized and it will lead to large amount of expenses. One of the remedies for heat removal is injection of some part of monomers (or an inert) as liquid. In this case, the vaporization of liquid will remove heat from the bed and it can increase the capacity of these reactors.

Research Objectives:

  • Investigation of liquid injection effect on the hydrodynamics and heat-transfer in gas fluidized beds.
  • Development of DIA/PIV method for pressurized gas fluidized beds.
  • Applying multi-scale approach for implementation of liquid injection in Eulerian-Eulerian CFD models.