مطالعه شبيه‌سازي و بررسي اثر تغيير حلال در واحد بازيابي گوگرد شركت پتروشيمي ايلام با استفاده از مطالعات سينتيكي راكتورهاي هيدروتريتينگ و جذب كربونيل سولفيد

Simulation study an‎d investigation on solvent changing effect in the sulfur recovery unit of Ilam Petrochemical Company using kinetic studies on hydrotreating reactors an‎d carbonyl sulfide absorption

مهندسي شيمي

In this study, aimed at improving the performance of the sulfur recovery unit at Ilam Petrochemical Company, the effect of solvent change in the process of absorbing acidic gases was investigated an‎d analyzed. Given the importance of removing sulfur compounds from natural gas streams an‎d its role in reducing equipment corrosion, enhancing product quality, an‎d meeting environmental requirements, a precise simulation of various units was conducted using HYSYS software. In this regard, different units, including hydrotreating reactors an‎d the Merox unit (for the absorption an‎d oxidation of mercaptans an‎d carbonyl sulfide), were comprehensively simulated an‎d analyzed. Subsequently, by changing the solvent type from diethanolamine to methyl diethanolamine an‎d examining different compositions an‎d concentrations of the solvent, the effect of this change on the removal efficiency of hydrogen sulfide, carbon dioxide, an‎d carbonyl sulfide gases, energy consumption, thermal load of the regeneration tower, an‎d operational stability of the system was eva‎luated. The simulation results showed that in Unit 30, the use of methyl diethanolamine improved the selec‎tivity for hydrogen sulfide absorption over carbon dioxide an‎d reduced steam consumption in the regeneration tower. Additionally, a kinetic model for carbonyl sulfide absorption in the Merox unit was developed an‎d validated with experimental data. Overall, the results indicate that in Unit 20, substituting MDEA with DEA is not recommended due to the low reaction rate constant during the design phase of this unit, which can lead to the formation of sodium sulfide salts in the caustic loop, reduced extraction tower efficiency, potential tray flooding in the extraction tower, an‎d increased maintenance an‎d mechanical costs. This research can serve as a foundation for future studies on the design an‎d optimization of gas sweetening an‎d sulfur recovery units from a kinetic an‎d thermodynamic perspective.

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