Resumo

SILVA, H.S.; VENTURINI, R. B.  e  GONZALEZ, J.E.. Gas-solid non catalytic reactions: a mathematical model based on heat transfer analysis. Lat. Am. appl. res. [online]. 2004, vol.34, n.2, pp.111-118. ISSN 0327-0793.

The analysis of temperature profiles in spherical samples under chemical reaction is presented here as an adequate tool to identify if a gas-solid reaction system belongs to the unreacted core model or to the progressive conversion one. This analysis has been applied to the thermal decomposition of natural carbonates (dolostone, limestone and travertine from San Juan, Argentina and limestone from Neuquén, Argentina). The mathematical model based on heat transfer combined with chemical reaction presented here, allows to predict temperature profiles in spherical samples of natural carbonates under thermal decomposition. Reaction times obtained from thermogravimetric studies of thermal decomposition of dolostones, and those predicted by the calculation procedure presented here, disagree in less than 12%.

Palavras-chave : Mathematical Modeling; Transport Processes; Heat Transfer; Kinetics; Reaction Engineering.

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