Effect of Ammonia on the Absorption Kinetics of Carbon Dioxide into Aqueous 2-Amino-2-methyl-1-propanol Solutions

• Published in: Industrial & engineering chemistry research Vol. 48; no. 8; pp. 4022 - 4029
• Main Authors: Choi, Won-Joon, Min, Byoung-Moo, Seo, Jong-Beom, Park, Sang-Wook, Oh, Kwang-Joong
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 15.04.2009
• Subjects: Applied sciences; Chemical engineering; Exact sciences and technology; Separations; Carbon dioxide; Kinetics
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/ie8018438

Reaction rate constants of aqueous 2-amino-2-methyl-1-propanol (AMP)/ammonia (NH3) solutions with carbon dioxide (CO2) were determined by measuring their absorption rates. The CO2 absorption characteristics of an NH3 solution added to AMP were investigated using a stirred-cell reactor. The CO2 absorption rates into aqueous blended amine solutions were measured at different pressures (p A = 5, 10, and 15 kPa) and temperatures (293, 303, 313, and 323 K). Additive concentrations of 1, 3, and 5 wt % NH3 were added for each 30 wt % AMP solution. The results showed that the addition of NH3 to AMP significantly increased the CO2 absorption rates of AMP by 144%. In addition, the reaction rate constant for a blend of AMP and NH3 with CO2 as a function of temperature was 1.6- to 2.4-fold higher than that of AMP without NH3. The reaction rate constants were k 2,AMP = 1.543 × 107 exp(−3019.92/T) and k 2,NH3 = 1.847 × 1010 exp(−4954.25/T).