CO2 and H2S absorption in aqueous MDEA with ethylene glycol: Electrolyte NRTL, rate-based process model and pilot plant experimental validation

Gonzalez, Karen; Boyer, L.; Almoucachar, David; Poulain, Bénédicte; Cloarec, Eric; Magnon, Christophe; Meyer, Frédérick de

doi:10.1016/j.cej.2022.138948

Cited by 23 publications

(11 citation statements)

References 86 publications

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“…Absorption is among the most established technologies in the oil and gas industry for removal of acid gases such as H 2 S and CO 2 from natural gas streams using a liquid solvent. 12 H 2 S absorption involves transfer of H 2 S from the gas feed into the physical or chemical solvent in the packed or plated conventional absorption columns. In general, the reaction mechanisms for the absorption process can be divided into two categories such as chemical and physical absorption, based on the interaction strength between the solvents and H 2 S.…”

Section: Technologies For H2s Capture and Removalmentioning

confidence: 99%

Latest technological advances and insights into capture and removal of hydrogen sulfide: a critical review

Aminuddin,

Bustam,

Johari

2024

RSC Sustain.

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Section: Technologies For H2s Capture and Removalmentioning

confidence: 99%

Latest technological advances and insights into capture and removal of hydrogen sulfide: a critical review

Aminuddin,

Bustam,

Johari

2024

RSC Sustain.

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“…H 2 S removal in the industry is performed using dry ,− and wet methods. − Dry methods are dominated by Claus’s high-temperature desulfurization and desulfurizer adsorption. , These processes are relatively mature and could purify sulfur-containing gases well, but the equipment is large and does not satisfy the emergency requirements of H 2 S leakage from gas fields with complex terrain. The wet H 2 S removal including chemical and physical solvents is a typical gas–liquid two-phase absorption process.…”

Section: Introductionmentioning

confidence: 99%

Pilot-Scale Experimental Study on the Coupling of Venturi-Bubbling Reactor to Promote the Absorption of Leaked H₂S

Zhang,

Zheng,

Dong

2024

ACS Omega

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Natural gas generates varying concentrations of H 2 S during natural formation and extraction, and H 2 S leak accidents are frequent, posing a significant threat to the safety of human life and the environment. Conventional treatment technology equipment is large and does not meet the emergency requirements of the complex topographical gas field. This study aimed to design a pilot-scale method coupling the venturi and bubbling reactors to reduce equipment size and improve emergency capabilities for the absorption of leaked H 2 S. It found that the ring system self-priming venturi reactor, which was suitable only for the coarse treatment of toxic gases, maintained an absorption efficiency of around 50% under most operating conditions, with substantial variations due to changes in process parameters, but that redundancy of the bubbling reactor was high. With the synergistic effect of venturi and bubbling, the coupling process had an extremely high absorption efficiency, basically more than 95%. The experiments also showed that the H 2 S concentration at the outlet of the venturi−bubbling reactor increased with increasing inlet gas concentration and gas volume. The absorption performance improved significantly on increasing Fe 3+ concentration; it increased first and then remained constant, and the optimum Fe 3+ concentration for the absorption of leaked H 2 S was 21 000 mg/m 3 . The absorption performance decreased with increasing submergence height and then remained stable after the size of the inlet approached 600 mm, whereas the overall absorption efficiency of the venturi−bubbling reactor remained constant. The optimum operating temperature range was 10 °C−50 °C. The experimental system kept the outlet concentration below the emergency discharge standard for a continuous period of 48 h following practical use in the gas field and resulting in significant enhancement in mass transfer performance, fully satisfying the emergency requirements.

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“…Another possibility is to slow down the mass transfer of CO 2 in the liquid phase, for example, by operating at lower temperatures, by using less reactive amines, or by replacing part of the water with certain physical co-solvents . The latter two options, however, might also negatively impact the H 2 S absorption kinetics and capacity, − making it harder to reach the H 2 S specification in the treated gas and thus limiting or even canceling the potential gain in selectivity at iso-H 2 S absorption. The addition of small quantities of acids (and a further increase in solvent flow rate) might allow reaching a lower H 2 S content in the treated gas .…”

Section: Introductionmentioning

confidence: 99%

Selective H₂S Absorption in Aqueous Tertiary Alkanolamine Solvents: Experimental Measurements and Quantitative Kinetic Model

Rozanska,

Valtz,

Riva

et al. 2023

Ind. Eng. Chem. Res.

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In the treatment of many fuel gases such as biogas, natural gas, syngas, and so on, tertiary alkanolamines play an important role in the selective removal of H 2 S with respect to CO 2 . The selectivity might be required for various reasons: to respect more stringent H 2 S specifications, to optimize the performance of the Claus unit, to lower the cost of CO 2 capture, and so on. The H 2 S/CO 2 selectivity is mainly kinetic and, to a lesser extent, thermodynamic. A novel experimental setup has been put in place to measure the time evolution of the simultaneous absorption of H 2 S and CO 2 . The results of an extensive experimental campaign with 18 different aqueous tertiary alkanolamine solvents (13 mol % amine, 87 mol % H 2 O) are presented. Although the absorption of H 2 S is expected to be a very fast proton transfer, a significant variation in H 2 S absorption rates and thus in selectivity is observed. This could not only be explained by the pK a or the viscosity of the amines. Therefore, an accurate quantitative molecular simulations-based kinetic model is developed and validated. The study allowed us to better understand the molecular origin of selectivity, as well as to identify amines with a higher selectivity than aqueous MDEA (MethylDiEthanolAmine), the standard industrial selective solvent.

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CO2 and H2S absorption in aqueous MDEA with ethylene glycol: Electrolyte NRTL, rate-based process model and pilot plant experimental validation

Cited by 23 publications

References 86 publications

Latest technological advances and insights into capture and removal of hydrogen sulfide: a critical review

Latest technological advances and insights into capture and removal of hydrogen sulfide: a critical review

Pilot-Scale Experimental Study on the Coupling of Venturi-Bubbling Reactor to Promote the Absorption of Leaked H₂S

Selective H₂S Absorption in Aqueous Tertiary Alkanolamine Solvents: Experimental Measurements and Quantitative Kinetic Model

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CO2 and H2S absorption in aqueous MDEA with ethylene glycol: Electrolyte NRTL, rate-based process model and pilot plant experimental validation

Cited by 23 publications

References 86 publications

Latest technological advances and insights into capture and removal of hydrogen sulfide: a critical review

Latest technological advances and insights into capture and removal of hydrogen sulfide: a critical review

Pilot-Scale Experimental Study on the Coupling of Venturi-Bubbling Reactor to Promote the Absorption of Leaked H2S

Selective H2S Absorption in Aqueous Tertiary Alkanolamine Solvents: Experimental Measurements and Quantitative Kinetic Model

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Product

Resources

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Pilot-Scale Experimental Study on the Coupling of Venturi-Bubbling Reactor to Promote the Absorption of Leaked H₂S

Selective H₂S Absorption in Aqueous Tertiary Alkanolamine Solvents: Experimental Measurements and Quantitative Kinetic Model