Mixed Amine Absorbent based on Hollow Fiber Membrane Contactor Removes CO2 from Flue Gas

Abstract

The application of membrane gas absorption for the synthesis of carbon dioxide from exhaust gases is specifically explored in connection to the combined supply of heat and carbon dioxide to greenhouses. Novel absorption liquids perform better than monoethanolamine when used with easily available, reasonably priced polyolefin membranes from the market in terms of system stability and mass transfer. In this paper, the PTFE (Polytetrafluoroethylene) hollow fiber membrane contactor was decarbonized by three mixed amine absorbents, MDEA-PG, MDEA-PZ, and MDEA-MEA, focusing on optimizing the CO₂ removal process. The order of CO₂ membrane absorption performance of amine absorbent is MDEA-MEA> MDEA-PG> MDEA-PZ. The reasonable mass concentration range of the mixed amine absorption liquid is 30% to 35%. In addition, MEA, MDEA-PG, and MDEA-PZ have the highest CO₂ removal rate when the solute ratio is 1:0.6, which are 43.15%, 32.36%, and 30.55%, respectively. These results indicate significant enhancements in CO₂ capture compared to traditional single-amine solutions.