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1523862 
Journal Article 
Kinetics of Carbon Dioxide Absorption into Aqueous Amino Acid Salt: Potassium Salt of Sarcosine Solution 
Aronu, UE; Hartono, A; Hoff, KA; Svendsen, HF 
2011 
Yes 
Industrial and Engineering Chemistry Research
ISSN: 0888-5885
EISSN: 1520-5045 
50 
18 
10465-10475 
WOS:000294791000010 
The kinetics of CO(2) absorption into an unloaded aqueous
solution of the potassium salt of sarcosine (KSAR) was studied using a string-of-disks contactor
for the concentration range of 1.0-4.0 kmol m(-3) and temperatures of 25-62 degrees C. The
zwitterion and termolecular mechanisms were reinterpreted to account for nonidealities in salt
systems due to the effect of ionic strength through the introduction of an ionic factor, k(ion),
Both models adequately represent the experimental data with no practical difference. The reaction
rate constant for KSAR is high but comparable to values for amines. It increases considerably
with temperature and concentration. The reaction order varies with KSAR concentration from 1.25
to 1.81, with an overall average value of 1.58. The experimentally derived kinetic model was
combined with a thermodynamic model of aqueous KSAR from Aronu et al. (Chem. Eng. Sci. 2011, 66,
2191-2198) to predict the loading dependency of the overall mass-transfer coefficient, K(G),
determined in pilot-plant experiment. The predicted results show that the experimental data agree
well with the pilot-plant results. 
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