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Mechanism and Kinetics of Carbon Dioxide Capture Using Activated 2‐Amino‐2‐methyl‐1,3‐propanediol
Author(s) -
Gordesli F. Pinar,
Ume Cyril Sunday,
Alper Erdogan
Publication year - 2013
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20787
Subject(s) - chemistry , kinetics , reaction rate constant , aqueous solution , chemical kinetics , carbon dioxide , activation energy , reaction rate , reaction mechanism , organic chemistry , thermodynamics , catalysis , physics , quantum mechanics
The continued use of fossil fuels as primary sources of energy in industry and other applications stands the test of time, due to their availability and relatively lower cost than alternative sources of energy. In view of this perspective, obtaining an advanced bulk carbon dioxide (CO 2 ) capture medium becomes an urgent necessity so as to mitigate their effect, especially in global warming, as the use of fossil fuels produces a high rate of CO 2 . In this work, the mechanism and kinetics of CO 2 capture using aqueous piperazine (PZ) as an activator to 2‐amino‐2‐methyl‐1,3‐propanediol (AMPD) were investigated. The termolecular mechanism was used to model the kinetics of the system. Reaction kinetics of the single pure amines was first obtained. The reaction rate constant, the k value of AMPD, was 77.2 m 3 /kmol·s, with a reaction order, n , of 1.25 at 298 K. while that of PZ was equal to 11,059 m 3 /kmol·s and n as 1.49 at 298 K. Blending of 0.05 kmol/m 3 of PZ with 0.5 kmol/m 3 of AMPD gave a rate constant, k , value of 23,319 m 3 /kmol·s and n equal to 1.23 at 298 K. The result obtained for the blended system is more than twice the value of the summation of the corresponding pure amines; in addition, it is comparably higher than the rate constant of monoethanolamine (MEA) in use as a commercial solvent for CO 2 capture. Therefore, an aqueous blend of PZ with AMPD deserves more comprehensive study as a solvent for commercial CO 2 capture. AMPD like other sterically hindered amines absorbs CO 2 in an equimolar ratio that is significantly higher than that of MEA. PZ serves as a promoter in the amine mixture and is required in a very small proportion.