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Ethylene glycol elimination in amine loop for more efficient gas conditioning
Nasibeh Hajilary1, Mashallah Rezakazemi2
1Department of Chemical Engineering, Faculty of Engineering, Golestan University, Gorgan, Iran. n.hajilari@gu.ac.ir.
Mono ethylene glycol (MEG) in amine loops can increase H2S absorption but also raises corrosion and energy use. Keeping MEG below 15% in lean amine loops minimizes these negative impacts in gas sweetening processes.
Area of Science:
- Chemical Engineering
- Petroleum Refining
- Process Optimization
Background:
- Mono ethylene glycol (MEG) is used to prevent hydrate formation in gas processing.
- MEG can inadvertently enter amine gas sweetening units, potentially impacting performance.
- Understanding MEG's effects is crucial for efficient gas sweetening operations.
Purpose of the Study:
- To investigate the detrimental effects of MEG in amine gas sweetening units.
- To identify practical strategies for mitigating MEG's negative impacts.
- To analyze MEG's influence on H2S absorption, corrosion, and energy consumption.
Main Methods:
- Process simulation of the South Pars Gas Field (Asalouyeh, Iran) gas sweetening unit (phases 2 and 3).
- Evaluating the impact of varying MEG concentrations in the amine loop.
- Investigating downstream effects on the sulfur recovery unit (SRU).
Main Results:
- Increased H2S absorption with MEG presence (e.g., 25% MEG increased absorption from 1.09 to 3.78 ppm).
- Elevated reboiler temperatures, amine degradation, steam consumption, and corrosion rates (up to 17.20 mpy).
- Increased energy consumption, amine makeup, and foaming due to enhanced solubility of hydrocarbons (BTEX).
- Investigated MEG's side effects in the SRU, including BTEX transfer and catalyst deactivation.
Conclusions:
- MEG concentrations below 15% in the lean amine loop minimize adverse effects, aligning with industrial observations.
- Mitigation strategies include using fresh MDEA, insulation, operational optimization, and source reduction of MEG.
- Effective management of MEG is essential for maintaining gas sweetening efficiency and plant integrity.
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