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Digital reconstruction of porous media

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The knowledge of transport characteristics of monomers and diluents in porous polyolefine particles is important for the quantitative prediction of particle growth in gas- and liquid-dispersion reactors for catalytic polymerization of olefins. Transport of monomers and diluents affects the rate of polymerization, the rate of particle growth, the copolymer composition distribution within the particle and the morphology of growing particle. Moreover, transport characteristics have a strong impact on the degassing of polyolefin powder in the post-polymerization processing. Spatial distribution of phases of porous domain can be represented in the general case by the so called phase function, which takes the value of 1 in the case of pore phase and 0 in the case of solid phase. The discretized medium is ready for computation of distribution of concentration of penetrant species, effective transport properties, for instance effective heat conductivity or effective diffusivity, etc.

 

 

 

 
 
 Figure 5. Evolution of the monomer concentration profile in the polyethylene particle reconstructed from X-ray micro-tomography images during its degassing. (a) t = 1 s; (b) t = 10 s; (c) t = 100 

 

Published Results:

Meisterová L., Zubov A., Smolná K., Štěpánek F., Kosek J. X-ray Tomography Imaging of Porous Polyolefin Particles in Electron Microscope, Macromolecular Reaction Engineering, 2013, DOI: 10.1002/mren.201300002.

Zubov A., Pecháčková L., Šeda L., Bobák M., Kosek J. Transport and reaction in reconstructed porous particles: Model validation. Chemical Engineering Science, 2010, 65(7),2361–2372.

Šeda L., Zubov A., Bobák M., Kosek J., Kantzas A. Transport and Reaction Characteristics of Reconstructed Polyolefin Particles. Macromolecular Reaction Engineering, 2008, 2 (6), 495 – 512.

 

Contact

Juraj Kosek
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+420 220 443 296

University of Chemistry and Technology Prague
Department of Chemical Engineering
Technicka 5
166 28 Prague 6
Czech Republic

University of West Bohemia
New Technologies Research Centre (NTC)
Univerzitní 8
306 14 Pilsen
Czech Republic