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Gas treating (refinery / natural gas) ADIP process

Applications: The ADIP process is a regenerative process developed to selectively reduce H2S in gas to very low concentrations in the presence of CO2. The ADIP process uses an aqueous solution of diisopropanol amine (DIPA) or the aqueous solution of methyldiethanol amine (MDEA). MDEA is used for those applications in which high selectivity for H2S is required. Depending on operating conditions 20-60% of the CO2 is co-absorbed if DIPA is used as the ADIP solvent, while this can be reduced to 10%-30% if MDEA is used as the solvent. The ADIP process can also be used for enrichment of acid gas feed to a sulphur recovery plant, to achieve a higher H2S content. Integration of gas treating with the SCOT solvent system is an option.

Description: The H2S-containing gas is contacted counter-currently in an absorption column with ADIP solvent. The regenerated solvent is introduced at the top of the absorber. The H2S-loaded solvent (rich solvent) from the absorber is heated by heat exchange with regenerated solvent and is fed back to the regenerator, where it is further heated and freed of the acid gases with steam. The acid gases removed from the solvent in the regenerator are cooled with air or water, so that the major part of the water vapor is condensed. The sour condensate is reintroduced into the system as a reflux. The acid gas is passed to the sulphur recovery plant (Claus plant) in which elemental sulphur is recovered from the H2S.

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