(378q) Model of the Multi-Channel Ceramic Membrane for so2 Absorption | AIChE

(378q) Model of the Multi-Channel Ceramic Membrane for so2 Absorption

Authors 

Kong, X. - Presenter, Nanjing Tech University
Yiqun, F., Nanjing University of Technology
Qiu, M., Nanjing Tech university
Multi-channel ceramic membranes have higher specific surface area and packing density than tubular membranes, making them more suitable for industrial applications. There is a broad application for ceramic membranes to absorb low concentrations of SO2 in exhaust. the membrane phase resistance becomes the main resistance during the absorption of SO2 by the hydrophobic membrane. Therefore, for the multi-channel ceramic membrane, the thickness of the central channels is too large, resulting in poor mass transfer performance. Wetting the membrane pores with NaOH accelerates the interfacial reaction rate which greatly reduces the membrane phase resistance. To find optimal NaOH concentration conditions and geometry of multi-channel membrane contactors, we employed a numerical 3D model to simulate SO2 absorption process and verified the model by comparing its results with experimental data. Compared to conventional tubular ceramic membranes, multi-channel ceramic membranes have only a 25% decrease in flux under the same conditions. The effect of multi-channel membrane geometry was studied by this model. The gas concentration distribution in membrane contactor shows that channels have different desulfurization performance. Furthermore, the simulation reveals that the SO2 removal performance is affected by the pore arrangement of the multi-channel membrane. The membrane tube of each configuration corresponds to an optimum NaOH concentration that achieves maximum flux. The multi-channel membrane contactor exhibit ed great application potential.