1987 · 13 citations · 0 references
EngineeringChemical EngineeringChemistryCatalysisReaction EngineeringTransport PhenomenaCarbon Dioxide TransportMass TransferReactor ModelingActivation EnergyApparent Activation EnergyCarbon Dioxide Mass TransferCarbon Dioxide TransferEquilibriumMass Transfer KineticsParallel ReactionsPseudo-first-order Kinetics
The rate of absorption of CO/sub 2/ into 2 molal MDEA was measured by following solution composition in a stirred-cell batch reactor. The conditions investigated were 9.5 - 62/sup 0/C at a nominal CO/sub 2/ pressure of 1 atm. The data were modelled with a combined mass transfer and equilibrium model which treated the reaction of CO/sub 2/ with MDEA as second order and reversible, rather than pseudo-first order. The resulting activation energy was 13.7 kcal/gmol, and the rate constant at 30.5/sup 0/C was 4.0 (Ms)/sup -1/. The assumption of pseudo-first order conditions was found to reduce the apparent activation energy to approximately 9 kcal/gmol. CO/sub 2/ absorption into 1.36 molal MDEA/0.61 molal MEA was studied at 31/sup 0/C. The experimental data were predicted better by a mass transfer model based on a shuttle mechanism than by one with two parallel reactions.