Interpretation of the mechanism diffusion in the gas-solid process of the dessulfurization reaction

Química Nova

Mortari, Daniela Andresa¹  Universidade de São Paulo, São Carlos, Brasil¹  Crnkovic, Paula Manoel¹  Milioli, Fernando Eduardo¹  Ávila, Ivonete¹ 

关键词: diffusion mechanism;    limestone;    dessulfurization.;   

DOI  :  10.1590/S0100-40422010000900013

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

The present paper aims to interpret the SO2 diffusion mechanism process for two different limestones: a calcite and a dolomite. In previous study, the apparent activation energies for sulfation reaction were between 3.03 and 4.45 kJ mol-1 for the calcite, and 11.24 kJ mol-1 for the dolomite. Using nitrogen porosimetry it was possible to observe that the dolomite presents mesopores of 0.03 μm, while the calcite presents mesopores of 0.01 μm. The evaluation of limestones porous structure together with their kinetic parameters, allowed concluding that the diffusion mechanism follows Fick law and Knudsen law for dolomite and calcite, respectively.

【 授权许可】

Unknown