Novel biphasic solvent of AEP/1-propanol/H2O for CO2 capture with efficient regeneration performance and low energy consumption
SEPARATION AND PURIFICATION TECHNOLOGY(2021)
摘要
Biphasic solvents have been attracting increasing attention in CO2 capture recently due to its energy-saving potential. However, most current biphasic solvents still face the problem of limited desorption performance. To solve the problem, a novel biphasic solvent of 1-(2-aminoethyl)piperazine (AEP)/1-propanol/H2O solution was proposed. The absorption capacity was 1.26 mol CO2.mol(-1) amine, which was 2.3 times that of MEA. The regeneration efficiency was 74% and the cyclic capacity after 5 absorption-desorption experiments was 0.90 mol CO2.mol(-1) amine, which was 2.7 times that of MEA. The absorption-desorption performance of AEP/1-propanol/H2O solution was much better compared with most current biphasic solvents. Meanwhile, AEP/1-propanol/H2O solution had a low regeneration heat of 2.74 GJ.t(-1)-CO2, which was 27.9% lower than that of MEA. Moreover, 13C NMR analysis was used to investigate the absorption-desorption mechanism and species distribution. The multiple amino groups in AEP could react with CO2 to produce carbamate and carbonate. The generated absorption products were mainly concentrated in the CO2-rich phase, while the CO2-lean phase contained much 1propanol. Most of the absorption products were decomposed during regeneration, so the high desorption performance was achieved. Overall, AEP/1-propanol/H2O solution is a promising energy-saving candidate for industrial CO2 capture due to its competitive absorption-desorption performance and low regeneration energy.
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关键词
CO2 capture,Biphasic solvent,Regeneration efficiency,Regeneration energy,Mechanism
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