Modeling and Experimental Study of Carbon Dioxide Absorption in Aqueous Alkanolamine Solutions Using a Membrane Contactor

Abstract

The performance of a laboratory-scale membrane contactor was investigated for the case of CO2 absorption into separate aqueous solutions of monoethanolamine (MEA) and methyldiethanolamine (MDEA). The variation in the flux of the CO2 absorption rate with the CO2 partial pressure, liquid CO2 loading, liquid velocity, and temperature was studied individually in an apparatus giving well-defined and controlled experimental conditions. A two-dimensional diffusion−reaction model was developed and used to predict the results of the experiments. Initial and boundary conditions for the concentrations of chemical species were calculated by an equilibrium speciation model based on the solution method given by Astarita et al. (Gas Treating with Chemical Solvents; Wiley: New York, 1983). Corrections for nonideality were introduced by using a salting-out correction and by tuning the model to experimental VLE data. It was found that the diffusion of the ionic reaction products had a significant rate-limiting contribution to the observed fluxes and these diffusivities were regressed from parts of the experimental data.

Dynamic simulation of MEA absorption process for CO2 capture from power plants

“…The liquid velocity through the column is assumed constant while the gas velocity, is estimated from the following expression (Hoff et al, 2004),…”

“…where α is the CO 2 laoding (mol CO 2 /mol MEA). Meanwhile, the molar extent of reaction is determined by the following equation (Hoff et al, 2004),…”

Hollow fiber membrane contactor absorption of CO2 from the flue gas: Review and perspective

“…This method attracts many researchers' attention due to the operation without limitations caused by foaming, channeling, flooding and entrainment. Membrane gas absorption is a novel method with high efficiency, less required energy and low costs relative to conventional absorption methods (Feron and Jansen, 1997;Hoff, 2003). Furthermore, the hollow fiber membrane contactor (HFMC) has attracted the attention of researchers for the advantages of high-performance absorption, small volume and lightweight (Klaassen, 2005).…”

Equimolar Carbon Dioxide Absorption by Ether Functionalized Imidazolium Ionic Liquids

“…[6][7][8][9][10][11][12][13][14] Even though these amine-based methods are highly efficient for CO 2 capture, there are several concerns like; corrosion, loss of amine due to their volatile nature, degradation of amines by sulphur containing compounds and oxidative degradation of amines in presence of oxygen. [15][16][17] These drawbacks lying in the alkanolamine absorption process hinder the industrial application.…”