Hydrogen Sulfide Removal From Hot Producer Gas With Sintered Absorbents

The Bureau of Mines prepared three sintered materials capable of removing H₂S from producer gas at 1000° to 1500°F. They are mixtures of ferric oxide and fly ash, ferric oxide and pumice stone, and red mud (a ferric oxide-containing residue from processing bauxite). All three absorbents were virtually completely regenerable with air. A sintered Fe₂O₃; (25%)-fly ash 75%) mixture was tested through nine H₂S absorption-air regeneration cycles without loss of absorplion capacity or attrition of the pellets. The absorbent with the greatest capacity was a red mud, absorbing 16.0% by weight of sulfur at 1000° F, 24.0% at 1250° F, and 45.1 % at 1 500° F.