Development Of Rotor-Stator Reactor

A novel rotor-stator reactor (RSR) was developed in this paper. The rotor-and stator-parts were arranged in an interval sequence along radial direction, which consists of multiple inlet regions along radial direction. The fluid was redistributed and dispersed when passing through every layer of stator-and rotor-parts, so the liquid maldistribution can be avoided to a great extent. The channels of fluid are not easy to be fouled because fluid stands high shear force when passing through the gaps between the rotor-parts and corresponding stator-parts. It is suitable for high viscous or crystal system. The RSR has been applied for the national patent of China.The studies of mass transfer characteristics of the RSR were carried out by using a typical liquid-controlled mass transfer system——removal oxygen from water by nitrogen. The dimension analysis was used to develop the correlation of the volume mass transfer coefficient of liquid phase. Besides, the characteristics of gas pressure drop of the dry and wet RSR were investigated by adopting air-water system. The results were as follows:(1) The deoxygenation ratio in the RSR can be reached to98%at the range of conducted experiments. The volume mass transfer coefficient of liquid phase of RSR is at the same order of magnitude (i.e.104mol·m-3·s-1) as that of rotating packed bed (RPB).(2) The correlation of the volume mass transfer coefficient of liquid phase was deduced. The relative error between predicted and measured content of oxygen in the discharged liquid is within the range of±15%.(3) The gas pressure drops of the dry and wet RSR are lower than45mmH2O. The pressure drop of wet RSR is10mmH2O larger than that of wet RPB in the parallel-current conditions. In the other conditions, the pressure drops of RSR are less than that of RPB.In addition, the micromixing efficiency of RSR was investigated by employing the iodide-iodate reaction as working system. Based on the incorporation model, the calculating expressions were deduced, and the estimated micromixing time of RSR is to reach about10-5s. It proves that RSR has excellent micromixing efficiency.Finally, the feasibility of preparing nano-CaCO3and nano-Mg(OH)2by RSR were investigated. Cubic calcium carbonate with mean particle size of40-50nm was obtained in the RSR using a multiphase reaction system of Ca(OH)2-H2O-CO2. The plate-like Mg(OH)2with mean particle size of60-80nm was also gained in the RSR employing solutions of MgCl2and NaOH as reagents.