A Hydrodynamic Study in a Sieve Plate Sectionalized Bubble Column

Abstract

The sectionalization of conventional bubble columns to tray bubble column byperforated trays has been used in chemical, biochemical, and petroleum processesas an effective way to improve the gas-liquid contacting efficiency, and reduceliquid backmixing. In this study, an experimental semi-batch tray bubble columnsetup has been built. Column 0.15 m inside diameter and total height of 2.20 m issectionalized into four stages using three perforated plates to investigate theeffect of tray geometry, superficial gas velocities and liquid phase physicalproperties on overall gas holdup. The overall gas holdup is measuredexperimentally by bed expansion technique. For studying the effect of physicalproperties of the liquid phase, two different gas and liquid systems are used (airwaterand air-methanol solution).Methanol solution was used as the liquid phaseto simulate the hydrodynamic behavior of the high gas holdup systems.Remarkable increases of up to 80% in the overall gas holdup have been observedin tray column as compared to conventional bubble column when this liquidsystem was used. Experimental results of tray bubble column shows significantincrease the overall gas holdup in comparison with conventional bubble column.Correlations have been used for the estimation of the fractional gas holdup inbubble column with and without tray. Comparison of the model predictions withthe experimental data and with the published data of other authors shows fineagreement which ensure the reliability and confidentiality of the adopted thecorrelations to be used in further designation.