Modeling of Selective Hydrogen Sulfide Absorption Using MDEA Solution in a Packed Column

Afkhamipour,, Morteza; Azin, Reza; Osfouri, Shahriyar

Modeling of Selective Hydrogen Sulfide Absorption Using MDEA Solution in a Packed Column

Document Type : Research Article

Authors

Department of Chemical Engineering, Faculty of Engineering, Persian Gulf University, Bushehr, I.R. IRAN

Abstract

In this paper, a steady-state model based on mass transfer for selective absorption of hydrogen sulfide gas in MethylDiEthanolAmine (MDEA) solution, in the packed absorption tower is presented. This model is able to predict the concentration and temperature profiles in gas and liquid phases for the (MDEA-H₂S-CO₂-H₂O) system. In order to predict the profile of CO₂ concentration, the second-order kinetic constants of reaction between gas and MDEA solution was used. Also, among the existing kinetic data, the best one was selected. In addition, the effective parameters in obtaining these profiles and the maximum point of selectivity factor were examined in this model. In order to evaluate accuracy of proposed model, the results were compared with from a pilot plant test as well as using operating data from absorption packed tower of the gas sweetening unit of phases 4 and 5 of South Pars Gas Complex. The obtained results reveal an acceptable compatibility between experimental data and prediction of the presented model.

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