Analysis for the speciation in CO2 loaded aqueous MEDA and MAPA solution using 13C NMR technology
Abstract The competitive and cooperative reactions between the intramolecular primary and secondary amino groups in CO 2 absorption have been investigated in this work. N -Methylethylenediamine (MEDA) and N -methylpropane-1,3-diamine (MAPA) were studied with various CO 2 loadings at 25 °C. The 13 C NMR technology was employed to obtain accurate 13 C peak areas and chemical shifts for determining the concentration of each species in both of the diamine-CO 2 H 2 O systems. The results showed that the relative amounts of the species is primary-carbamate secondary-carbamate > di-carbamate in the CO 2 absorption process. Moreover, the relative hydrolysis order of the carbamates is di-carbamate > secondary-carbamate > primary-carbamate. The competitive and cooperative reaction mechanism was then proposed based on these results. Finally, it was found that in both the MEDA and the MAPA ternary systems, the whole CO 2 absorption process can be divided into three stages: competitive stage, buffer stage and hydrolysis stage, each of which showed a different trend in the amount of each species as well as in the pH value. Highlights The relationship between the intramolecular primary and secondary amino groups to reacts with CO 2 were evaluated. The CO 2 absorption process in MEDA and MAPA solution were divided into three reaction stages. The speciation in CO 2 loaded MEDA and MAPA were studied.
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