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According to Petropars’ Public Relations and International Affairs Office, the successful start-up of Unit 108 prevents the release of hazardous hydrogen sulfide (H₂S) gas into the environment while producing elemental sulfur as a valuable industrial feedstock.

The SRU plays a vital role in the oil, gas, and petrochemical industries by:

Converting toxic H₂S into elemental sulfur,

Preventing environmental pollution, and

Providing raw material for industries such as sulfuric acid production, fertilizers, rubber, polymers, pharmaceuticals, and cosmetics.

In contrast to previous projects at South Pars, this was the first time all five critical SRU sections were simultaneously brought online with full reliance on domestic expertise. These sections include:

Acid Gas Enrichment (AGE),

Incinerator,

First-stage Claus Reactor,

Second-stage Claus Reactor, and

Tail Gas Treatment Unit (TGTU).

Commissioning Details:

On February 4, 2025, the plant began receiving acid gases (with H₂S concentrations below 20%) from four gas trains (GTU-1, 2, 3, 4) into the AGE section.

There, using an MDEA chemical solution, the H₂S concentration was enriched to about 40%.

Simultaneously, the incinerator was activated to control emissions.

Following stabilization, on February 10, the enriched acid gas was routed to the Claus reactors, where 96% of the H₂S was converted into molten sulfur.

Final treatments reduced residual H₂S levels to less than 10 parts per million (ppm) before transferring the molten sulfur to storage tanks and subsequent solidification in Unit 144.

This achievement demonstrates Petropars’ capability in executing complex projects and enhancing Iran’s technical self-reliance in the oil and gas sector.