New modelling approach to liquid–solid reaction kinetics: from ideal particles to real particles

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Tapio Salmi, Henrik Grénman, Johan Wärnå, Dmitry Yu. Murzin
Förläggare: Elsevier
Publiceringsår: 2013
Tidskrift: Process Safety and Environmental Protection
Tidskriftsakronym: Chem. Eng. Res. Des.
Volym: 91
Nummer: 10
Artikelns första sida, sidnummer: 1876
Artikelns sista sida, sidnummer: 1889
Antal sidor: 14
ISSN: 0263-8762
eISSN: 1744-3563


Abstrakt

Typical features of liquid-solid reactions were reviewed: reaction kinetics, mass transfer effects and particle morphology. It was concluded that classical liquid-solid models based on ideal, non-porous geometries (sphere, infinite cylinder, slab) cannot satisfactorily describe real reactive solid particles with various surface defects, such as cracks, craters and limited porosity. 'Typically a too low reaction order for the reactive solid is predicted by the classical models. The surface morphology can be revealed by electron microscopy, which gives inspiration to develop new mathematical models for reactive solids.

Generalized product layer and shrinking particle models were developed for arbitrary geometries deviating dramatically from ideal geometries. The approach is based on the use of a shape factor (a), which can obtain high values for particles with surface defects. The modelling approach was illustrated with numerical simulations and an experimental case, leaching of zinc sulphide with ferric ions: A general methodology for investigation of fluid-solid reactions was proposed.


Nyckelord

Fluid-solid reactions, Particle size distribution, Shape factor

Senast uppdaterad 2019-22-10 vid 04:09