This study focuses on identifying the CO2 absorption
mechanism in an aqueous potassium carbonate (K2CO3)/homopiperazine (homoPZ) solution, at various CO2 loading. 1H nuclear magnetic resonance (NMR) and 13C NMR
measurements were conducted at 295 K within the absorbent concentration
of homoPZ 7.5 wt % and K2CO3 15 wt %/homoPZ
7.5 wt %. The CO2-loaded absorbents were prepared by using
vapor–liquid equilibrium (VLE) apparatus at 333 K. The results
show that the amount of carbamate and bicarbamate in the CO2-loaded K2CO3/homoPZ solution was larger than
in the homoPZ solution. The free homoPZ that is able to react with
CO2 increases in the aqueous K2CO3/homoPZ solution because the K2CO3 serves as
a buffer. It was found that the NMR method can be used to determine
the CO2 absorption mechanism of the absorbents.
>> At the carbon dioxide capture process using the aqueous amine solution, degradation of absorbents is main factor to reducing the process performance. Also, degradation mechanism of absorbent is important for understanding the environmental risk, route of degradation products, health risk etc. In this study, the degradation products of MEA were studied to clarify mechanism in thermal degradation process. The degradation products were analyzed using a 1 H NMR (nuclear magnetic resonance) and 13 C NMR. The analysis methods used in this study provide guidelines that could be used to develop a degradation inhibitor of absorbent and a corrosion inhibitor.
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