ArticleThe CO2 absorption and desorption performance of the Triethylenetetramine (cas 112-24-3) + N,N-diethylethanolamine + H2O system☆

Add time:08/29/2019    Source:sciencedirect.com

Post-combustion CO2 capture (PCC) process faces significant challenge of high regeneration energy consumption. Biphasic absorbent is a promising alternative candidate which could significantly reduce the regeneration energy consumption because only the CO2-concentrated phase should be regenerated. In this work, aqueous solutions of triethylenetetramine (TETA) and N,N-diethylethanolamine (DEEA) are found to be efficient biphasic absorbents of CO2. The effects of the solvent composition, total amine concentration, and temperature on the absorption behavior, as well as the effect of temperature on the desorption behavior of TETA–DEEA–H2O system were investigated. An aqueous solution of 1 mol·L− 1 TETA and 4 mol·L− 1 DEEA spontaneously separates into two liquid phases after a certain amount of CO2 is absorbed and it shows high CO2 absorption/desorption performance. About 99.4% of the absorbed CO2 is found in the lower phase, which corresponds to a CO2 absorption capacity of 3.44 mol·kg− 1. The appropriate absorption and desorption temperatures are found to be 30 °C and 90 °C, respectively. The thermal analysis indicates that the heat of absorption of the 1 mol·L− 1 TETA and 4 mol·L− 1 DEEA solution is − 84.38 kJ·(mol CO2)− 1 which is 6.92 kJ·(mol CO2)− 1 less than that of aqueous MEA. The reaction heat, sensible heat, and the vaporization heat of the TETA–DEEA–H2O system are lower than that of the aqueous MEA, while its CO2 capacity is higher. Thus the TETA–DEEA–H2O system is potentially a better absorbent for the post-combustion CO2 capture process.

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