Abstract
In this paper, we present a new equipment enable to measure simultaneously solubilities of CO2 and H2 S in diethanolamine aqueous solution. Its purpose is to increase the number of experimental data about these systems. Indeed, if the literature is relatively well documented on H2 S or CO2 systems, solubility data concerning both acid gases are relatively scarce. The experimental approach developed in this paper is a semi-synthetic one where the vapour phase is sampled and the H2 S/CO2 ratio is measured by gas chromatography. New experimental values of partial pressures of CO2 and H2 S in an aqueous solution of diethanolamine are presented and compared with others from literature through a rigorous thermodynamic model.
Highlights
The share of natural gas in the world energy panorama has been appreciably growing for the last 20 years
For the classic alkanolamine used in the industry (monoethanolamine (MEA), diethanolamine (DEA) and N-methyldiethanolamine (MDEA)), if the solubility of a single acid gas (CO2 or H2S) is well documented, it is not the case for the mixtures of both acid gases
The apparatus used in the present study is based on the static method which has already been employed by Kennard and Meisen (1984) to measure the solubility of carbon dioxide in aqueous solutions of diethanolamine and by Maddox and Elizondo (1989) to determine the solubilities of hydrogen sulfide or carbon dioxide in aqueous solutions of diethanolamine
Summary
The share of natural gas in the world energy panorama has been appreciably growing for the last 20 years This trend is expected to increase in the few decades with the progressive replacement of fuel oil and coal by this relatively environment-friendly source of energy. The experimental apparatus has already been used to study single acid gas (H2S or CO2) solubility in aqueous solutions of diethanolamine (Barreau et al, 2006). Number of experimental points reported by literature in the case of (water + alkanolamine + acid gases) systems. The obtained data are compared with literature ones by using a consistent thermodynamic model to validate their accuracy
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