THIOPAQ O&G Process Description

The THIOPAQ O&G process integrates gas purification with sulphur recovery in one unit. The sour gas first comes into contact with the lean solution in the absorber. This solution absorbs the H2S to form sodium sulphides, HS‾,  and sweet gas exits the absorber.

Depending on the sour gas pressure, the sulphide-loaded or rich solution is routed to a flash vessel or directly to the bioreactor, which is operated at atmospheric pressure and ambient temperature, where the micro-organisms oxidise the sulphide to elemental sulphur. The lean solution is recirculated to the absorber, while part of the lean solution is routed to the sulphur recovery section, in order to remove sulphur from the system.

The produced elemental sulphur is separated from the solvent in the sulphur recovery section. Part of the bioreactor contents are recycled over the settler to maintain the desired sulphur content in the system. The concentrated slurry is dewatered in a decanter centrifuge. The filtrate is recycled back to the process via the bioreactor. A small slipstream of the clear solvent is bled from the system to prevent an accumulation of salts beyond the allowed maximum.

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