Efficient CO2 absorption and low temperature desorption with non-aqueous solvents based on 2-amino-2-methyl-1-propanol (AMP)

摘要: Abstract In the present study, an efficient process for CO2 capture using some AMP–alkanolamine blends, namely DEA, MDEA, MMEA, DIPA, in non-aqueous solvents has been described. The used are mixtures of ethylene glycol or 1,2-propandiol with either methanol ethanol. Additionally, pure 1-propanol diethylene monomethyl ether have also employed. Throughout whole set experiments, amine solutions were continuously circulated a closed cycle between absorber (set at 20 °C) and desorber 65, 70, 75, 80 °C). absorption efficiency equilibrium is range 73.1–95.9%. carbon containing species amine–CO2–alcohol equilibria analyzed by 13C NMR spectroscopy showing that they originate from alcohol and/or carboxylation. AMP–DEA–1-propanol–CO2 system gives solid compound identified as carbamate derivative AMP, [(AMPH)(AMPCO2)], its state spectrum confirmed single crystal X-ray structure determination. [(AMPH)(AMPCO2)] instantaneously dissolves methanol, ethanol affording respective monoalkyl carbonate. lower stripping temperature studied absorbents offers several potential advantages respect to conventional aqueous same alkanolamines, yet preserving comparable efficiency.