Kinetic approach to sulphite chemical aggression in porous media

► We propose a kinetic description of a fluid species moving in a porous medium and chemically interacting with it. ► Two fluid species diffusing in a background medium of two solid species. ► Porosity included by a modification of the standard kinetic equations. ► Continuum limit (CL) model obtained by Chapman-Enskog expansion. ► Assessement by comparing the CL model with macroscopic models in the literature.