Carbon dioxide has been implicated as a major contributor to global climate change. Consequently, the capture and sequestration of carbon dioxide has been a rapidly expanding area of research. Current carbon dioxide capture is commonly performed with aqueous solutions of alkanolamines (e.g., monoethanolamine, diethanolamine, N-methyldiethanolamine). A significant disadvantage of these solutions lies in the high thermal energy (due in large part to the high specific heat of water) required to release captured CO2 and regenerate the corresponding capture reagent. Here we report the CO2 binding capacity of anhydrous N,N-Dimethylethanolamine (DMEA), N,N-Diethylethanolamine (DEEA), and N,N-Diisopropylethanolamine (DIPEA). While these materials show no absorption at STP, they do absorb CO2 under pressure via both chemical binding and physical absorption. The chemical CO2-bound derivatives of these materials are zwitterionic salts which remain liquids. Binding capacities, trends, pressure-swing regeneration and characterization will be discussed.
ASJC Scopus subject areas
- Chemical Engineering(all)