TY - JOUR
T1 - Kinetics and mechanism study of homogeneous reaction of CO2 and blends of diethanolamine and monoethanolamine using the stopped-flow technique
AU - Xiao, Sini
AU - Liu, Helei
AU - Gao, Hongxia
AU - Xiao, Min
AU - Luo, Xiao
AU - Idem, Raphael
AU - Tontiwachwuthikul, Paitoon
AU - Liang, Zhiwu
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017
Y1 - 2017
N2 - The stopped-flow technique was applied on the measurement of the kinetics of carbon dioxide (CO2) absorption into aqueous blends of monoethanolamine (MEA) and diethanolamine (DEA) over the temperature range of 293–313 K. The investigation of blended MEA + DEA with various molar ratios of DEA to MEA revealed that the reaction mechanism between CO2and blended absorbents could be different at different ratio of DEA to MEA. Consequently, the kinetic data obtained in this work was split into two groups with respect to the different molar ratios of DEA to MEA in order to study the different mechanisms. In group A, the concentration of MEA was in the range of 5–15 mol/m3and the concentration of DEA was low (varied between 5 and 15 mol/m3), while in group B, the DEA concentration was high (varied between 140 and 240 mol/m3) and the concentration of MEA remained in the range of 5–15 mol/m3. Modified models based on the termolecular mechanism were developed for each group and used to interpret the experimental kinetic data. Results showed that the models could explain the data well with an AAD of 4.71% for group A at low concentration of DEA and 3.33% for group B at high concentration of DEA. It is interesting to point out that DEA barely reacts with CO2at low molar ratios (i.e. group A) whereas at high DEA concentration (i.e. group B), both MEA and DEA reacted with CO2.
AB - The stopped-flow technique was applied on the measurement of the kinetics of carbon dioxide (CO2) absorption into aqueous blends of monoethanolamine (MEA) and diethanolamine (DEA) over the temperature range of 293–313 K. The investigation of blended MEA + DEA with various molar ratios of DEA to MEA revealed that the reaction mechanism between CO2and blended absorbents could be different at different ratio of DEA to MEA. Consequently, the kinetic data obtained in this work was split into two groups with respect to the different molar ratios of DEA to MEA in order to study the different mechanisms. In group A, the concentration of MEA was in the range of 5–15 mol/m3and the concentration of DEA was low (varied between 5 and 15 mol/m3), while in group B, the DEA concentration was high (varied between 140 and 240 mol/m3) and the concentration of MEA remained in the range of 5–15 mol/m3. Modified models based on the termolecular mechanism were developed for each group and used to interpret the experimental kinetic data. Results showed that the models could explain the data well with an AAD of 4.71% for group A at low concentration of DEA and 3.33% for group B at high concentration of DEA. It is interesting to point out that DEA barely reacts with CO2at low molar ratios (i.e. group A) whereas at high DEA concentration (i.e. group B), both MEA and DEA reacted with CO2.
KW - Absorption mechanism
KW - Carbon capture
KW - Kinetics
KW - Mixed amine
KW - Stopped-flow technique
UR - http://www.scopus.com/inward/record.url?scp=85012278145&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2017.01.100
DO - 10.1016/j.cej.2017.01.100
M3 - Article
AN - SCOPUS:85012278145
SN - 1385-8947
VL - 316
SP - 592
EP - 600
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -