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Kinetics of CO 2 Absorption into Aqueous AMP/HMDA/TEG Mixtures
Author(s) -
Patil Mayurkumar P.,
Vaidya Prakash D.
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201702464
Subject(s) - chemistry , aqueous solution , reaction rate constant , diamine , kinetics , nuclear chemistry , polymer chemistry , physics , quantum mechanics
Mixtures of 2‐amino‐2‐methyl‐1‐propanol (AMP), 1,6‐hexamethyl diamine (HMDA), triethylene glycol (TEG) and water, which merge the loading capacity of AMP, reactivity of HMDA and low volatility of TEG, are improved CO 2 ‐capturing solvents. In the present study, kinetic aspects of the reaction of CO 2 with the blend AMP+HMDA were investigated using co‐solvents TEG+Water. Kinetic data were experimentally obtained in a stirred cell at 303–318 K. The concentrations of AMP and HMDA in the mixtures were changed in the 2–3 and 0.1‐0.5 M range whereas TEG concentration was changed between 0.7 and 2 M. Pseudo‐first order rate constants were measured. Knowing the CO 2 absorption rates in the aforesaid mixtures, the second‐order rate constant (65195 M −1 s −1 ) for the reaction between CO 2 and HMDA at 308 K was found. The activation energy for the CO 2 ‐HMDA system in aqueous solution was 33.1 kJ/mol. Equilibrium solubility of CO 2 in AMP/HMDA/TEG/Water mixtures was measured. Finally, it was established that N,N’‐dimethyl‐1,6‐hexamethyl diamine (or HMDA−N,N’) – a dialkyl derivative of HMDA – is a further attractive promoter for AMP in TEG+Water mixtures.