Screening test for aqueous solvents used in CO2 capture: K2CO3 used with twelve different rate promoters
K 2 CO 3 solution is widely used in the CO 2 -capture industry. In particular, it has advantages for treating CO 2 in flue gas under high-temperature and high-pressure conditions. However, it has a lower CO 2 -loading capacity and slower absorption kinetics than those of amines, which are its major...
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Published in | The Korean journal of chemical engineering Vol. 31; no. 1; pp. 125 - 131 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Boston
Springer US
01.01.2014
한국화학공학회 |
Subjects | |
Online Access | Get full text |
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Summary: | K
2
CO
3
solution is widely used in the CO
2
-capture industry. In particular, it has advantages for treating CO
2
in flue gas under high-temperature and high-pressure conditions. However, it has a lower CO
2
-loading capacity and slower absorption kinetics than those of amines, which are its major disadvantages. Thus, in this study, we investigated ten loading-rate promoters, five primary amines and five secondary amines, to develop higher CO
2
-loading capacity and faster absorption kinetics. The screening tests of the absorption and desorption processes were conducted at 70 °C and 90 °C, respectively. Based on the results, we concluded that all the amines used improved the CO
2
-loading and absorption kinetics compared with the use of K
2
CO
3
alone. At a certain value CO
2
loading, the respective performance of the primary and secondary amines was twice and thrice better, respectively, than the neat K
2
CO
3
solution. Thus, secondary amines had superior absorption capacity and absorption/desorption rate compared to primary amines. Among the secondary amines, pipecolic acid, sarcosine, and isonipecotic acid were determined as the most effective absorption rate promoters. |
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Bibliography: | G704-000406.2014.31.1.017 |
ISSN: | 0256-1115 1975-7220 |
DOI: | 10.1007/s11814-013-0200-y |