Process for treating gas containing hydrogen sulfide

Patent · Tue Mar 02 04:00:00 EST 1976

OSTI ID:7240330

Tsuruta, H; Hiwatashi, Y; Hirabayashi, T; Kumata, S

A process is described for treating a hydrogen sulfide-containing gas in a closed loop system wherein said gas is passed through and absorbed by an alkaline aqueous absorbent containing an alkali carbonate and an oxidation catalyst. The solution containing the dissolved hydrogen sulfide is oxidized with an oxygen-containing gas to convert the absorbed hydrogen sulfide into elementary sulfur and sulfur salt compounds. After separation of the elementary sulfur from the solution, the solution is recirculated for use as alkaline absorbent. A part of the recirculated solution is diverted and subjected to mixed-combustion with an auxiliary fuel in a combustion furnace at an air ratio lower than 0.9 and at a temperature of 700/sup 0/C to 1100/sup 0/C to thermally decompose the sulfur compounds into hydrogen sulfide and an alkali carbonate. The gaseous products of decomposition are brought into direct contact with boiling water to collect the alkali carbonate in the form of an aqueous solution and leaving hydrogen sulfide in the gas. 4 Claims, 1 Drawing Figure.

• Assignee: Nittetu Chemical Engineering Ltd.
• Patent Number(s): US 3941875
• OSTI ID: 7240330
• Country of Publication: United States
• Language: English

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ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
COKE OVENS
ELEMENTS
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
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PROCESSING
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SORPTIVE PROPERTIES
SULFIDES
SULFUR
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SURFACE PROPERTIES
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