Vortex&Pulsed Reactor And Applications

Recently, a new intensification technology for the gas-liquid mass transfer has appeared abroad, We called it Vortex&Pulsed Reactor (VPR). This technology is analogous to Higee. Rather than spin the packing, as Higee does, VPR spins the gas. But, compares with Higee equipment, the VPR has it own characteristics as below:(1) No packing, simple structure, reduced height and easy to achieve series operation.(2) Resistant to fouling, low gas flow pressure-decrease and high turndown.(3) Low manufactory cost, low power consumption and easy to be maintained.Based on the study and analysis of the abroad relative literatures, the experimental VPR was designed and produced to carry out the cold model experiment. The characteristics of gas-liquid mass transfer were studied based on the double-film theory and oxygen removing in nitrogen-water system, and the design of the structure of the equipment was discussed primarily as well.In this paper, the feasibility of applying the VPR for the preparation of the super fine powders including the Nano-powder was studied. And for the first time VPR was used in the filed of preparation of the Nano-Calcium Carbonate and super fine magnesium hydroxide powder.According to the study of this paper, the conclusions are as following:1. The Characteristics of the Mass Transfer:(1) The correlative formula by means of non-dimension group between the overall liquid phase volumetric mass transfer coefficient of the VPR and relative factors is:(2) When the structure of the equipment is settled down, the compositions of both gas and liquid phases, temperature and pressure of the system stay constant, the correlative formula of the overall liquid phase volumetric mass transfer coefficient of the VPR can be simplified as following:(3) The experimental calculation equation of the overall liquid phase volumetric mass transfer coefficient of the VPR Kxa derived from the double-film theory is:Kxa=3L/2πNTUI/(b+h)R02, where the NTU is the number of mass transfer unit,(4) In the experiment range, according to the structure of the equipment (the diameter of the spray nozzleφ=3mm) and in the nitrogen-water oxygen removing system, the overall liquid phase volumetric mass transfer coefficient of the VPR is:(5) The error between the overall liquid phase volumetric mass transfer coefficient calculated by the correlative formula and the calculated result based on the experimental data is smaller than7%which proves that the correlative formula is accurate and can be applied in some respects.2. The Preparation of the Super Fine/Nano Powder:The Nano-calcium carbonate powder with the diameter of40-50nm were prepared by the VPR. The former party of the magnesium hydroxide was prepared by the VPR and then went through the water-heating treatment to produce super fine magnesium hydroxide with mean diameter of0.6-0.8um. The new core-forming reactor for the preparation of the Nano-calcium carbonate and super fine magnesium hydroxide was discovered. Compared to the Higee reactor, the VPR has simpler structure, lower manufactory cost and operation cost.3. Relative Patents:(1) China National Invention Patent:Patent Name:vortex&pulsed reactor, Patent No.:ZL03121458.4.(2) Utility Model Patent:Patent Name:A Type of Liquid Oscillator, Patent No.:ZL03243004.3.