Bestimmung der effektiven Phasengrenzfläche einer Packungskolonne im Labormaßstab mit dem chemischen System Kohlendioxid – wässrige Natronlauge

Packed columns are commonly used as absorption equipment. Their design requires knowledge of mass transfer parameters, that are typically determined through complex and costly experimental procedures. Therefore, the suitability of laboratory-scale packed columns for investigating various factors influencing mass transfer measurements is of particular interest.
In this thesis, a method for determining the effective interfacial area of a laboratory-scale packed column using the chemical system carbon dioxide – aqueous sodium hydroxide solution was developed and implemented. The effects of hydroxide ion concentration in the range from 0.1 to 1 mol L-1 as well as the specific liquid load on the effective interfacial area were investigated. A gas distributor, a liquid distributor and a support plate were manufactured using 3D printing.
The results showed a positive correlation between the effective interfacial area and the specific liquid load at hydroxide ion concentrations in the range from 0.1 to 0.4 mol L-1 and a negative correlation at a concentration of 1 mol L-1. When neglecting the gas-side mass transfer resistance, a decrease in the effective interfacial areas with increasing hydroxide ion concentration was observed. The gas-side mass transfer resistance can be considered negligible for hydroxide ion concentrations between 0.1 and 0.4 mol L-1. However, this assumption is no longer valid at a concentration of 1 mol L-1. The exact concentration above which the gas-side mass transfer resistance becomes non-negligible could not be determined.