Sterically hindered amines in solution have been explored for selective H2S capture, where they have been found to be selective for removing H2S over CO2 compared to the conventional methyl diethanolamine (MDEA) or unhindered amines in aqueous media. A disadvantage with these amine solutions is the high regeneration energies associated with aqueous systems. As a result, the use of solid supported materials with lower heat capacities and therefore potentially improved energy costs has been proposed. The current work explores the use of sterically hindered amines grafted on model solid support materials to determine their H2S selectivity in the presence of CO2 and CH4. Using a breakthrough apparatus, in-situ infrared spectroscopy and thermogravimetric analysis, we have investigated (i) the H2S selectivity in a multicomponent gas mixtures, (ii) the nature of the chemisorbed species formed during H2S adsorption and (iii) the effect of concentration and temperature on H2S adsorption performance using these sterically hindered amine adsorbents under dry conditions.

Selective removal of hydrogen sulfide from simulated biogas streams using sterically hindered amines

2019 Fall National Meeting

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