A model of a bench-scale methanation reactor was set-up by modifying the classical two-phase modelapproach and introducing an additional bulk flow from bubble to dense phase to consider the volumecontraction of the methanation reaction. The model uses experimentally determined kinetics andhydrodynamic correlations from literature. It was satisfyingly validated by comparing the calculated gasconcentration profiles with the experimental data, especially with respect to initial reaction rates andreactor exit concentrations.