Absorption of carbon dioxide with aqueous blends of 2-amino-2-methyl-1-propanol and sodium glycinate

The absorption of carbon dioxide into aqueous blends of 2-amino-2-methyl-1-propanol (AMP) and sodium glycinate (SG) was investigated from 293k to 313k in a double stirred-cell contactor. Five systems of which 1.5 kmol/m³ AMP mixed with various SG concentrations (0.2, 0.4, 0.6 and 0.8 kmol/m³) were studied. The average CO₂ absorption rates increased (11.47%, 10.07%, 9.18% and 5.33%) with an increase of SG concentrations (0.2 kmol/m³ SG at a time). Compared to 1.5 kmol/m³ AMP, the blends had an increase of absorption capacity of 11.5%~41.1% within 200 min. The absorption rates increased with an increase of temperature within the temperature range of 293k to 313k. The regenerating performance was also done by heating. The optimum regeneration temperature was 378 K for the mixture of 1.5 kmol/m³ AMP + 0.6 kmol/m³ SG. The aqueous blends of AMP + SG had a higher regenerating efficiency than either single SG or blends of AMP + MEA/DEA.