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With CO2, the kinetics are product layer diffusion controlled.
The results did not reveal formation of any product layer, thus excluding the shrinking core (product layer) model.
It is assumed that the carbonation reaction is kinetics controlled, neglecting the product layer diffusion effects.
At the later stages of the reaction, diffusion through the product layer is found to be controlling and involves migration of ions through the product layer.
However, heat transport and product layer diffusion are of minor importance.
Diffusion through the product layer was determined to be rate-limiting.
A modified correlation was presented to obtain product layer diffusion coefficients.
The final product layer was a fine, crystalline beta-silicon carbide.
The model includes mass and heat transport, transport through a product layer and chemical kinetics.
The coefficient of gas diffusion through the product layer (NaCl) was obtained at 300 600°C.
The dissolution process was controlled by the bulk diffusion through the product layer crystals.
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