Theoretical investigation of axial and local particle size distribution on expanded bed adsorption process.
The general rate model was developed and solved to describe protein adsorption in an expanded bed. The model takes into account axial variation of bed porosity, particle size distribution (PSD), external and intraparticle mass transfer, and dispersion in liquid and solid phase. The analysis of the influence of the model parameters on dynamic capacity (DC) was investigated. The simulation results showed that major impact on dynamic capacity is exerted by intraparticle mass transfer (particle diameter and pore diffusivity). The external mass transfer resistance and dispersion parameters have secondary effect on DC. The replacement of axial PSD by the mean particle diameter results in error in calculation of DC, which increases remarkably with the increase of mean particle diameter. The PSD can promote a very slow approaching of plateau concentration by breakthrough curves. It was shown also that axial bed porosity variation could be replaced by average porosity with negligible error for DC calculations.
Kaczmarski
Krzysztof
K
Faculty of Chemistry, Rzeszow University of Technology, ul. W. Pola 2, 35-959 Rzeszow, Poland. kkaczmarski@prz.rzeszow.pl
Bellot
Jean-Christophe
JC
D000327:Adsorption; D002845:Chromatography / Q000379:methods*; D045424:Complex Mixtures / Q000302:isolation & purification; D003198:Computer Simulation; D003470:Culture Media / Q000302:isolation & purification; D004058:Diffusion; D044085:Microfluidics / Q000379:methods*; D008956:Models, Chemical; D010316:Particle Size; D016062:Porosity; D011506:Proteins / Q000737:chemistry* / Q000302:isolation & purification*; D014462:Ultrafiltration / Q000379:methods*
D045424:Complex Mixtures; D003470:Culture Media; D011506:Proteins