Hydrodynamic And Mass Transfer Performance Research Of IP Type High-Efficiency Structured Packing

Combined with the development and requirement of chemical industrial applications, adhere to the "low resistance and high efficiency" concept, the IP type structured packing was designed. Instead of the traditional framework of straight line of X and Y type packings, the corrugation of IP type packing is alternately arranged by the two different kinds of polygonal lines, which corners are smooth transitional. Surface of IP type packing was rough treatment to enhance the performance of film forming. The cross-section area of fluid flow path is enlarged and narrowed alternately, which enhanced the mixing of gas and liquid phase. The liquid phase turbulence is promoted through the change of the angle, and the update of liquid film is advanced so that the mass transfer process can be strengthened.Under the ambient pressure and temperature, cold model experiment was carried on with four kinds of IP type wire gauze packings (IP 125, IP250, IP500, IP700) with air-water-oxygen system. The hydrodynamic and mass transfer performance was tested and the comparison of conventional X and Y type packings was done. Experimental results show that the pressure drop of IP type packing is increased with increasing of specific area, gas velocities, and liquid flow strength. In the same specific area, flooding gas velocity decreases gradually with growth of liquid spray densities. In the same liquid spray densities, flooding gas velocity decreases with increasing of specific area. Compared with X125 and CY700 type packings, the dry pressure drops of IP 125 and IP700 are decreased by 21% and 49%, respectively. Within the scope of comparison, wet pressure drop of IP700 type packing is less than CY700, and the gap increase gradually with the increase of gas velocity. And flooding gas velocity is 19% beyond that of CY700.In the experimental range of 16.87 m3·m-2·h-1≤L≤56.22 m3·m-2·h-1, the mass transfer performance of IP700 type packings are better than CY700, when L=33.73m3·m-2·h-1, HETP was averagely reduced by 14%.The appropriate models to predict the hydrodynamic performance of IP type packing were researched on the base of experimental data and structure characteristics of IP type packings. The correlations of pressure drop and flooding gas velocity can be obtained by models fitting. The calculation results indicate that the hydrodynamic correlations can predict accurately with the relative deviation less than 10%.Under the support of experimental data and correlations, the paper discusses the use of IP type packing in the processes of recovery of n-butyl alcohol solution and purification of methyl acetate. The application results reveal that the concentration of n-butyl alcohol solution is increased from 2% to 85%, crude methyl acetate is purified from 92.56% to 99.9%, which the production problems have been solved. It is proved that IP type packing possesses a favorable application prospect with the advantage of low energy consumption and high mass transfer efficiency.