Effects of residence time on selective absorption of hydrogen sulphide using methyldiethanolamine
by Satyadileep Dara; Abdallah S. Berrouk
International Journal of Process Systems Engineering (IJPSE), Vol. 2, No. 3, 2014

Abstract: Selective absorption of hydrogen sulphide (H₂S) using methyldiethanolamine (MDEA) has become a point of interest as means of minimising capital and operating costs of gas sweetening plants. This paper discusses the prominence of optimum design of column internals to best achieve H₂S selectivity using MDEA. To this end, a kinetics-based process simulation model has been developed for a commercial gas sweetening unit. Trends of sweet gas H₂S and CO₂ contents as function of fraction active area (and hence residence time) have been explained through analysis of interdependent heat and mass transfer phenomena. Guidelines for column internals design in order to achieve desired degree of H₂S selectivity are provided. Also, the effectiveness of various operating conditions in achieving H₂S selectivity for an industrial absorber with fixed internals is investigated.

Online publication date: Sun, 11-Jan-2015

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