Experimental and Computational-chemistry Study on Effect of Piperazine as a Promoter for CO2 Capture Solution
نویسندگان
چکیده
It is well known that small amount Piperazine (PZ) enhance the CO2 absorption properties of tertiary amine aqueous solution. Because the tert-amine has the lower heat of reaction, the blended amine solution, tert-amine with PZ, is attractive for low energy absorbent. There are some reports about the investigation of the mechanism of the blended amine solution, however, there still a difficulty in explanation of phenomena of blended amine system exists. In this paper, we will discuss the role of PZ on the PZ/tert-amine solution by experimental and computational study. We found that the chemical structure of tertiary amine has distinctive effect on absorption rate and CO2 loading. In addition, the computational-chemistry study suggests that proton of protonated PZ carbamate separates and reacts with tertiary amine resulting in formation protonated-tertiary amine and PZ carbamate anion. The latter substance can extract proton again from H2O + CO2, which enable CO2 dissolve into solution.
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