Process for removal and recovery of sulfide from coal gas

Patent · Tue May 22 04:00:00 EDT 1979

OSTI ID:5518803

Kimura, S; Takahashi, T

Hydrogen sulfide is removed from coal gas for gas turbine power generation and recovered as elemental sulfur by contacting a coal gas formed by gasification of coal with an iron oxide catalyst, thereby removing hydrogen sulfide from the coal gas and obtaining a desulfurized coal gas. The iron oxide catalyst of lowered desulfurization activity is regenerated, and a regeneration off-gas containing sulfur dioxide is obtained. A portion of the desulfurized coal gas is converted to reducing gas containing hydrogen, after which the hydrogen of the resulting reducing gas is reacted with the sulfur dioxide in a portion of the regeneration off-gas, thereby producing hydrogen sulfide. The resulting hydrogen sulfide is then reacted with the sulfur dioxide in the remaining portion of the regeneration off-gas in the presence of a catalyst, thereby producing a gas containing elemental sulfur, which is separated from the gas.

• Assignee: Hitachi, Ltd.
• Patent Number(s): US 4155990
• OSTI ID: 5518803
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL GAS
DESULFURIZATION
FLUIDS
GASES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IRON COMPOUNDS
IRON OXIDES
OXIDES
OXYGEN COMPOUNDS
REMOVAL
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS