After the implementation of more stringent sales gas specifications affecting CO2, H2S and mercaptans, ENI experienced bottlenecks in the Acid Gas Removal Units operated with MDEA-based solvent, which led to throughput reduction and higher operational costs due to penalties and blending with sulfur-free natural gas.
The test-run performed in the ENI gas production facility showed that the new DM-101 solvent, based on single-amine aqueous solution can meet the new sales gas specifications, achieving mercaptans removal efficiency of 60% and up to more than 90% depending on the operational conditions, without any modification of the existing facilities. The lean solvent temperature and especially the liquid-to-gas ratio are the available operational levers to adjust the mercaptans removal, finding the optimal trade-off between the sales gas specification and the SOx emissions from the Thermal Incinerator stack (via the Acid Gas Enrichment Units off-gas).
The test-run showed that the DM-101 can support the site goals, increasing the operational flexibility and assuring the production continuity, through the compliance with the sale gas specs and the production optimization of the asset, thanks to the exploitation of the sour section of the reservoir.
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