Removal of Carbon Dioxide by Absorption with Mixed Absorbent in a Cross-Flow Rotating Packed Bed

During the past few years, the most significant development to intensify mass transfer is the concept of contacting liquids and vapors in a centrifugal field. That is achieved by rotating a tours-shaped packing element. This concept was first proposed by Ramshaw and Mallinson in 1981 and named as “Higee” (high gravity). This kind of device is sometimes termed as “Rotating Packed Bed” (RPB). An RPB has been demonstrated to be a high-efficiency gas-liquid contactor in distillation, absorption, stripping, deaeration and reactive precipitation. The leader of this work has applied a cross-flow RPB to the removal of CO2 with single absorbent including NaOH, MEA and AMP solutions. The experimental results indicated that MEA could provide the highest removal efficiency of CO2. To increase absorption efficiency, this work will add other amines (AMP, PZ) to MEA solution, then investigate how mixed amines affect the removal efficiency of CO2. Therefore, the aim of this study is to elucidate the feasibility of a cross-flow RPB in absorbing CO2 from waste gas streams with mixed amine solution (AMP+MEA, PZ+MEA) under various operating parameter including amine mixing ratio, CO2 concentration, rotor speed, gas flow rate, mixed amine solution flow rate, and packing height. The results in this study may provide an empirical correlation and a theoretical analysis for future designs in the removal of CO2 from waste gas streams.

Project ID:PB9801-1425
External Project ID:NSC97-2221-E182-013-MY2