Modelling of absorption of CO2 in aqueous solutions of alkanolamines
Tutor / director / avaluadorSvendsen, Hallvard
Tipus de documentProjecte/Treball Final de Carrera
Condicions d'accésAccés restringit per acord de confidencialitat
At present, one of the most used methods for removing CO2 from gaseous streams is absorption into aqueous solutions of alkanolamines. In this process, the gas stream is brought into contact with an aqueous solution of alkanolamines in an absorption tower where CO2 absorption is realized. This reaction produces carbamate and protonated amine. In a desorber, the reaction is reversed and CO2 is produced as a pure gas and the amine solution regenerated. Modelling of the mass transfer in the contactors is important for the understanding, scale-up and optimization of these processes. This is a combined multicomponent diffusion reaction problem in its simplest case, complicated by convective transport of water. Also diffusivity varies through the reaction zone, which also must be taken into account. Solving the system of differential equations resulting from the modelling must be numerical as an analytical solution does not exist. The space resolution in the reaction domain must be very good and this puts severe demands on the discretization routines to be used. In this work, the various discretization methods, uniform grids, split uniform grids, nonuniform grids, and finally adaptive grids are studied. One of the methods studied is the method of lines techniques. For the adaptive methods also the methods of lines can be used in addition to the method of Bloom and Zegeling.