Treatment of gas streams containing hydrogen sulphide

Details Treatment of gas streams containing hydrogen sulphide Treatment of gas streams containing hydrogen sulphide

C - Chemistry, Metallurgy

01

B

C01B 17/04 (2006.01) B01D 53/14 (2006.01) B01D 53/52 (2006.01)

Patent

CA 2342136

A feed gas stream containing hydrogen sulphide is subjected in a furnace 6 to reactions in which part of the hydrogen sulphide is burned to form sulphur dioxide, and is which the sulphur dioxide reacts with residual hydrogen sulphide to form sulphur vapour. The sulphur vapour is condensed from the gas stream exiting the furnace 6 in a sulphur condenser 16. Residual sulphur dioxide is reduced back to hydrogen sulphide by hydrogen in a reactor 22. Water vapour is removed from the reduced gas in a quench tower 28 to form a water vapour-depleted gas stream. One part of the water vapour-depleted gas stream is sent to an adsorber vessel 30 in which hydrogen sulphide is absorbed in an absorbent. The resulting hydrogen sulphide - depleted gas stream is vented from the vessel 30 as a purge stream. Another part of the water vapour - depleted gas stream and a hydrogen sulphide - rich gas formed by desorbing hydrogen sulphide from the absorbent in a vessel 38 are returned as recycle streams to the furnace 6.

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