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Title: Method for reducing sulfate formation during regeneration of hot-gas desulfurization sorbents

The regeneration of sulfur sorbents having sulfate forming tendencies and used for desulfurizing hot product gas streams such as provided by coal gasification is provided by employing a two-stage regeneration method. Air containing a sub-stoichiometric quantity of oxygen is used in the first stage for substantially fully regenerating the sorbent without sulfate formation and then regeneration of the resulting partially regenerated sorbent is completed in the second stage with air containing a quantity of oxygen slightly greater than the stoichiometric amount adequate to essentially fully regenerate the sorbent. Sulfate formation occurs in only the second stage with the extent of sulfate formation being limited only to the portion of the sulfur species contained by the sorbent after substantially all of the sulfur species have been removed therefrom in the first stage.
 [1];  [1];  [2]
  1. (Morgantown, WV)
  2. (Westover, WV)
Issue Date:
OSTI Identifier:
United States of America as represented by United States (Washington, DC) NETL
Patent Number(s):
US 5348921
Research Org:
National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV
Country of Publication:
United States
method; reducing; sulfate; formation; regeneration; hot-gas; desulfurization; sorbents; sulfur; forming; tendencies; desulfurizing; hot; product; gas; streams; provided; coal; gasification; employing; two-stage; air; containing; sub-stoichiometric; quantity; oxygen; stage; substantially; regenerating; sorbent; resulting; partially; regenerated; completed; slightly; stoichiometric; amount; adequate; essentially; regenerate; occurs; extent; limited; portion; species; contained; removed; therefrom; sulfur sorbent; hot product; sulfate formation; gas desulfurization; product gas; gas stream; gas streams; coal gasification; coal gas; air containing; stoichiometric amount; removed therefrom; stoichiometric quantity; sulfur sorbents; hot-gas desulfurization; generation method; desulfurization sorbents; /502/423/