A grain size distribution model for non-catalytic gas-solid reactions


Heesink, A.B.M. and Prins, W. and Swaaij, W.P.M. van (1993) A grain size distribution model for non-catalytic gas-solid reactions. The Chemical Engineering Journal and the Biochemical Engineering Journal, 53 (1). pp. 25-37. ISSN 0923-0467

open access
Abstract:A new model to describe the non-catalytic conversion of a solid by a reactant gas is proposed. This so-called grain size distribution (GSD) model presumes the porous particle to be a collection of grains of various sizes. The size distribution of the grains is derived from mercury porosimetry measurements. The measured pore size distribution is converted into a grain size distribution through a so-called pore-tosphere factor whose value is also derived from the porosimetry measurements. The grains are divided into a number of size classes. For each class the conversion rate is calculated either according to the shrinking core model, involving core reaction and product layer diffusion as rate-determining steps or according to a new model in which some reaction at the grain surface is assumed to be limiting. The GSD model accounts for the phenomenon of pore blocking by calculating the maximum attainable conversion degree for each size class. In order to verify the model, two types of precalcined limestone particles with quite different microstructures were sulphided as well as sulphated. Furthermore, a single sample of sulphided dolomite was regenerated with a mixture of carbon dioxide and steam. For each reaction good agreement was attained between measured and simulated conversion vs. time behaviour.
Item Type:Article
Copyright:© 1993 Elsevier Science
Science and Technology (TNW)
Research Group:
Link to this item:http://purl.utwente.nl/publications/11207
Official URL:https://doi.org/10.1016/0923-0467(93)80004-G
Export this item as:BibTeX
HTML Citation
Reference Manager


Repository Staff Only: item control page

Metis ID: 106047