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• W4387235291 abstract "Abstract Objectives/Scope This paper describes operational feedback from one of our Acid Gas Removal Units (AGRUs), that operates an amine-based solvent technology, in the case of high H2S content in the sour gas (20 mol%). We show that the acidification of the solvent results in energy savings and a reduction of GHG emissions. Methods, Procedures, Process This paper focuses on the benefits of solvent acidification in an AGRU. In practice, the solvent acidification leads to a salting-out effect and lower residual acid gas content in the lean amine, allowing the optimization of the specific reboiler duty. The approach requires a regular solvent monitoring to quantify the solvent acidity and the residual amount of acid gases in the lean amine, and the evolution of the solvent degradation products over time. Indeed, the degradation products from amine oxidation are acidic components and excessive stripping may sometimes result in corrosion- and fouling-related operational issues. This shall be supported with modelling the salting out effect. Results, Observations, Conclusions In our case, we observe a continuous build-up of heat stable salts in the amine-based solvent, which come from the degradation of amine solvent after oxidant ingress. This induced a reduction of the H2S residual content from 500 ppmw to less than 50 ppmw. This allowed the optimization of the AGRU specific reboiler duty of about 20% energy savings (down to 80 kg 4 barg steam / m3 solvent), which leads to 10% reduction in GHG emissions. However, this salts build-up also generates operational issues such as higher corrosion rate of carbon steel equipment and fouling issues due to iron sulphates and carbonates deposits. Thus, this paper will present the trade-off found between energy savings and unit operability, based on our industrial feedback considering the natural acidification of the solvent. The modelling of the vapour-liquid equilibrium of the altered solvent is a must for unit optimization, considering the impact of acidic components coming from solvent degradation or components added on purpose to improve the solvent regeneration. This concept is currently already implemented in industrial sites, especially in low pressure units such as Tail Gas Treatment Units (TGTUs), to respect specifications on Sulphur compound emissions to the atmosphere. Novel/Additive Information This paper will present a solvent monitoring novel strategy to optimize the amount of steam required in the reboiler of the regeneration section without impairing the unit operability." @default.
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• W4387235291 date "2023-10-02" @default.
• W4387235291 modified "2023-10-16" @default.
• W4387235291 title "Industrial Operational Feedback of Solvent Acidification for a More Energy-Efficient Operation of an AGRU" @default.
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• W4387235291 doi "https://doi.org/10.2118/216112-ms" @default.
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