Absorption of carbon dioxide into aqueous Monoethanolamine + 1,3Diaminopropane Mixture Solution: Solubility, Mass Transfer, Reaction Kinetics

One of the solutions to reduce greenhouse gas emissions is the capture and storage of carbon dioxide. This work studies the absorption of Carbon Dioxide into aqueous solutions of 1,3Diaminopropane + Monoethanolamine mixture in a stirred cell contactor in which, the diaminopropane is added to solutions as an activator. The solubility of CO2 in this mixture with substance concentrations of MEA (10% wt) + DAP (5% wt) and MEA (12.5% wt) + DAP (2.5% wt) was measured at temperatures (313.15, 323.15 and 333.15 ) K. The gas solubility results are expressed as the partial pressure of CO2 (PCO2) against CO2 loading i.e. αCO2). The equilibrium and thermodynamic model based on improved Kent-Eisenberg have been proposed. AAD% for MEA (10% wt) + DAP (5% wt) and MEA (12.5% wt) + DAP (2.5% wt) was 12% and 16%, respectively. The pseudo- first order rate constant for kinetic reaction of DAP represented for this mixture which follows an Arrhenius temperature dependence with activation energy of 3.802×104kj/kmol which had R-square of 0.9372.Finally a physical property package for DAP + MEA was assembled and inserted into Aspen Plus V8.8 to simulate an absorption Tower (Rad-Frac).The results of sensitivity analysis showed that every 1%wt increase in DAP as an activator, enhanced the the percent of CO2 recovery, the results also indicated that the best percent for DAP is about 3%wt.