Treatment of a gas containing hydrogen sulphide.

摘要

Sour gas containing hydrogen sulphide has hydrogen sulphide absorbed therefrom in an absorbent in a vessel 4. A hydrogen sulphide rich gas stream is formed by desorbing hydrogen sulphide from the absorbent in a vessel 12. The resulting hydrogen sulphide rich gas stream is partially burned in a furnace 32. Resulting sulphur dioxide reacts therein with residual hydrogen sulphide to form sulphur vapour which is extracted in a condenser 44. Residual sulphur dioxide and sulphur vapour are reduced to hydrogen sulphide in catalyst stage 54 of a reactor 50. Water vapour is removed from the resulting reduced gas stream by direct contact with water in a quench tower 60. At least part of the resulting water vapour depleted gas stream is sent to the vessel 4 with the incoming sour gas stream.