Jump to main content
Jump to site search

Issue 4, 2011
Previous Article Next Article

Chemically selective gas sweetening without thermal-swing regeneration

Author affiliations

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

Back to tab navigation

Supplementary files

Publication details

The article was received on 30 Dec 2010, accepted on 10 Feb 2011 and first published on 11 Mar 2011


Article type: Paper
DOI: 10.1039/C0EE00839G
Citation: Energy Environ. Sci., 2011,4, 1385-1390
  •   Request permissions

    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

Search articles by author

Spotlight

Advertisements