Kinetics of carbon dioxide chemical absorption into cyclic amines solutions

Abstract

Chemical reaction kinetics between carbon dioxide with two cyclic amines (pyrrolidine and piperidine) have been studied using a stirred tank reactor with a planar interfacial area. The operational variables considered in this work have been the amine concentration in the liquid phase and the reaction temperature. Specific absorption rates have been determined under different experimental conditions. Results indicate that the absorption process occurs in a pseudo first reaction regime exhibited first-order kinetic with respect carbon dioxide and a second order for both cyclic amines. The reaction-rate constant was determined under the different experimental conditions, and it was correlated depending on the temperature by means of an Arrhenius type equation.

Gas–liquid mass‐transfer properties in CO2 absorption system with ionic liquids

“…39 Figure 2 shows that the 3 ] when adding the same amount of water (5 wt %) to the IL. Regarding the effect of water content on the CO 2 solubility, it presents that the CO 2 solubility decreases with the increasing water content from 5 to 10 wt % in IL.…”

“…To test the applicability of the present experimental setup, the solubility of CO 2 3 ] at 313 K were measured and compared with the data reported by Brennecke's research group. 39 Figure 2 shows that the 3 ] when adding the same amount of water (5 wt %) to the IL.…”

“…4 can be depicted as a good linear function of time in all cases, which verifies the reliability of the method for calculating k L used in this work. Figure 5 3 ]. However, the order of k L is not consistent with the order of the viscosities of ILs which have been presented in Table 3.…”

“…As depicted in Figure 6, the k L determination in different IL-H 2 O systems was investigated at 313 K. 3 ] system, the different values of the slopes lie in the difference of viscosity. Therefore, as expected, k L in IL-H 2 O systems depends on both the viscosity and the structure of ILs.…”

“…The enhancement factors and the reaction activation energy were quantified. Considering both the mass-transfer rates and the stability of IL in CO 2 absorption system, the new IL-based system MEA 1 [bmim] [NO 3 ] 1 H 2 O is recommended. …”