Physical absorption of CO₂ and propene into toluene/water emulsions

Heterogeneous mass transfer models for gas absorption in multiphase systems

“…For the single particle simulations values for the various physico-chemical parameters were taken from the experimental study of Littel et al (1994) were chosen as default values, see Table 5. A typical single particle model simulation result is given in Fig.…”

“…The simulation results of the 3-D heterogeneous model for the data by Littel et al (1994) show an underprediction of the mass transfer enhancement when assuming a droplet size of 3 m. For a slightly smaller droplet size a better description would have been obtained (see also Table 6). The average droplet size in the experiments might have been less than the 3 m used in the simulations.…”

“…This procedure is used to evaluate the average enhancement factor using the 3-D simulations for the parameter set of Table 5, representing the measurements of Littel et al (1994). Using these 3-D single particle simulations and the strategy proposed in Fig.…”

“…Di!usion in the droplet phase was added in this model, but this seems rather unrealistic considering the discontinuous character of the dispersed phase. Littel, Versteeg and Swaaij (1994) on the contrary, assumed in their modeling a thin layer of the dispersed phase at the gas}liquid interface to account for the large di!erences between the experimentally observed enhancement factors using the stirred cell apparatus and the ones calculated with the homogeneous model. By using a laminar, falling "lm apparatus Littel et al (1994) were able to minimize the e!ect of gravity, i.e.…”

“…Typical simulation results: a concentration "eld around the droplet and the local enhancement factors, evaluated at the gas}liquid interface. Littel et al (1994) mentioned that`the dispersed phase droplets were smaller than 3 m.a coe$cient (not shown in the "gures). The distance of the droplet to the gas}liquid interface seems to have no signi"cant in#uence on the foreland area (Fig.…”