Treatment of gas streams containing hydrogen sulphide

摘要

Part of a hydrogen sulfide containing feed gas is burnt in a furnace 6 in the presence of oxygen or oxygen-enriched air. Sulfur dioxide is formed and reacts with remaining hydrogen sulfide to form sulfur vapor which is extracted by means of a condenser 16. The resulting sulfur vapor depleted gas stream is reduced to hydrogen sulfide in stage 26 of a reactor 22. Water vapor is removed from the gas mixture condensation in a quench tower 32. A part of the resulting water-depleted gas stream is recycled to the furnace 6. Another part is sent for further treatment to form a purge stream. The sulfur vapor depleted gas stream is subjected to a step of catalytic reaction between hydrogen sulfide and sulfur dioxide is stage 24 of the reactor 22 upstream of the stage 26.