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Issue 4, 2011
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Chemically selective gas sweetening without thermal-swing regeneration

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Abstract

Natural gas purifications using chemically selective hydrogen sulfide (H2S) sorbents could be more efficient if chemical selectivity for H2S could be maintained without thermal regeneration of the sorbent. We used tertiary alkanolamines to reversibly capture H2S in the absence of water to produce hydrosulfide-based ionic liquids in high yield. These alkanolammonium hydrosulfide ionic liquids release H2S by exposure to inert gas or by mild heating. H2S can be rapidly and nearly quantitatively released at ambient temperature from the alkanolammonium hydrosulfide ionic liquids by the addition of nonpolar antisolvents, some of which naturally phase separate from the spent alkanolamine. The antisolvent-induced regeneration of the alkanolamine potentially allows an efficient H2S gas scrubbing process that is chemically selective and can be operated continuously at or near ambient temperature.

Graphical abstract: Chemically selective gas sweetening without thermal-swing regeneration

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Article information


Submitted
30 Dec 2010
Accepted
10 Feb 2011
First published
11 Mar 2011

Energy Environ. Sci., 2011,4, 1385-1390
Article type
Paper

Chemically selective gas sweetening without thermal-swing regeneration

P. K. Koech, J. E. Rainbolt, M. D. Bearden, F. Zheng and D. J. Heldebrant, Energy Environ. Sci., 2011, 4, 1385
DOI: 10.1039/C0EE00839G

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