The development and modelling of high-intensity impinging stream jet reactors for effective mass transfer in heterogeneous systems

摘要

Aj novel type of phase-contacting device has ben researched and is currently being developed at this institution. These high-intensity jet reactors provide significant improvement over conventional phase-contacting equipment due to the impingement of high-velocity feed streams upon each other in relativley small rector volumes, resulting in a highly turbulent mixing of phases. Due to this intimate ocntact betwen phases, mass transfer coefficients (k_L) of up to 1.5 × 10~(-3) m/s have been realised, which, coupled with values of the specific interfacial area (a) of 8-18 000 m~2/m~3, hav eyielded volumetric mass transfer coefficients (k_La) of up to 22 s~(-1) which are orders of magnitude hgiher than typical values obtianed by conventional systems. A model for the prediction of the interfacial area production in these new reactors has also been proposed. It is implememted in the form of a Monte Carlo simulation, based on the fact that bubble beakup in a turbulent environment is governed by the interactions of bubbles with turbulent eddies. Although the model is only a first attempt, it has proved to be highly practical and flexible, reasonably predicting trends in the experimental data.