Feasibility study on pressure swing sorption for removing H 2 S from natural gas

Citation data:

Chemical Engineering Science, ISSN: 0009-2509, Vol: 59, Issue: 12, Page: 2401-2406

Publication Year:
2004
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Repository URL:
https://works.bepress.com/miao_yu/21; https://scholarcommons.sc.edu/eche_facpub/744
DOI:
10.1016/j.ces.2004.03.006
Author(s):
Li Zhou; Miao Yu; Limei Zhong; Yaping Zhou
Publisher(s):
Elsevier BV
Tags:
Chemistry; Chemical Engineering; Engineering; pressure swing sorption; natural gas sweetening; silica gel; NMP
article description
The possibility of removing H 2 S from natural gas by applying a pressure swing sorption (PSS) process was experimentally proven. The key technique of the PSS process relies on using a special type of sorbent where solid grains were coated by a layer of liquid. It was shown that the solubility of H 2 S in the layer of liquid enlarged the concentration of H 2 S at the solid surface and, hence enhanced the adsorption of H 2 S on adsorbent. The solubility of H 2 S is very sensitive to the partial pressure above the layer of liquid, therefore, the saturated sorbent could be easily regenerated by sweeping the bed of sorbent with nitrogen at ambient temperature and pressure. The sorption capacity as well as the coated sorbent was stable during the operation cycles of sorption/desorption. The new PSS technology of sweetening natural gas is advantageous over the prevailing technologies of today in that both savings of investment and energy cost could be expected.