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Title: Process and apparatus for generating elemental sulfur and re-usable metal oxide from spent metal sulfide sorbents

A process and apparatus for generating elemental sulfur and re-usable metal oxide from spent metal-sulfur compound. Spent metal-sulfur compound is regenerated to re-usable metal oxide by moving a bed of spent metal-sulfur compound progressively through a single regeneration vessel having a first and second regeneration stage and a third cooling and purging stage. The regeneration is carried out and elemental sulfur is generated in the first stage by introducing a first gas of sulfur dioxide which contains oxygen at a concentration less than the stoichiometric amount required for complete oxidation of the spent metal-sulfur compound. A second gas containing sulfur dioxide and excess oxygen at a concentration sufficient for complete oxidation of the partially spent metal-sulfur compound, is introduced into the second regeneration stage. Gaseous sulfur formed in the first regeneration stage is removed prior to introducing the second gas into the second regeneration stage. An oxygen-containing gas is introduced into the third cooling and purging stage. Except for the gaseous sulfur removed from the first stage, the combined gases derived from the regeneration stages which are generally rich in sulfur dioxide and lean in oxygen, are removed from the regenerator as an off-gas and recycled as the first andmore » second gas into the regenerator. Oxygen concentration is controlled by adding air, oxygen-enriched air or pure oxygen to the recycled off-gas.« less
 [1];  [2]
  1. (Clifton Park, NY)
  2. (Lititz, PA)
Issue Date:
OSTI Identifier:
G.E. Environmental Services, Inc. (Lebanon, PA) OSTI
Patent Number(s):
US 5401475
Contract Number:
Research Org:
Country of Publication:
United States
process; apparatus; generating; elemental; sulfur; re-usable; metal; oxide; spent; sulfide; sorbents; metal-sulfur; compound; regenerated; moving; bed; progressively; single; regeneration; vessel; stage; third; cooling; purging; carried; generated; introducing; gas; dioxide; contains; oxygen; concentration; stoichiometric; amount; required; complete; oxidation; containing; excess; sufficient; partially; introduced; gaseous; formed; removed; prior; oxygen-containing; combined; gases; derived; stages; rich; lean; regenerator; off-gas; recycled; controlled; adding; air; oxygen-enriched; pure; complete oxidation; spent metal-sulfur; pure oxygen; oxygen concentration; partially spent; metal sulfide; gas containing; elemental sulfur; oxygen-containing gas; metal oxide; sulfur dioxide; enriched air; containing gas; stoichiometric amount; re-usable metal; spent metal; amount required; containing sulfur; excess oxygen; combined gas; oxygen-enriched air; contains oxygen; gases derived; generating elemental; sulfur compound; /422/423/502/