Solubility of hydrogen sulfide in aqueous solutions of N-methyldiethanolamine at high pressures

Sadegh, Negar; Thomsen, Kaj; Solbraa, Even; Johannessen, Eivind; Rudolfsen, Gunn Iren; Berg, Ole Johan

doi:10.1016/j.fluid.2015.02.016

Cited by 14 publications

(8 citation statements)

References 15 publications

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“…v w is the molar volume of pure water, and v H 2 S ∞ is the molar volume of H 2 S in infinite volume of water. The regression of data based on Brelvi and O'Connell 85 correlation used by Dicko 75 was applied to calculate the partial molar volume of H 2 S in pure water.…”

Section: Thermodynamic Modelmentioning

confidence: 99%

“…However, there are no data on the solubility of H 2 S in MDEA + PZ + SFL mixed solvent. In recent years, some H 2 S equilibrium solubility measurements in alkanolamine solutions have been reported in three categories of MDEA, MDEA-based, ,− and non-MDEA-based ,,,− solutions in aqueous and hybrid context with and without inert gas makeup. ,,,− The corresponding reports, together with the temperature and pressure ranges, are shown in Table .…”

Section: Introductionmentioning

confidence: 99%

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Vapor–Liquid Equilibria of H₂S in Aqueous Mixtures of N-Methyldiethanolamine + Piperazine + Sulfolane

Shokouhi¹,

Zoghi²,

Jalili³

et al. 2021

J. Chem. Eng. Data

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The solubility of hydrogen sulfide (H2S) in a mixed solvent containing (19.5 to 35.5) mass percent of N-methyldiethanolamine (MDEA), (0 to 11.6) mass percent of piperazine (PZ), (0 to 10) mass percent of sulfolane (SFL), and water at temperatures of (313.15 to 353.15) K and H2S partial pressures of up to about 2 MPa is reported. To determine the absorption of H2S, the density of the solutions in the corresponding temperature range was measured using a vibrating-tube densimeter. The results show that H2S solubility decreases with increasing temperature and increases with partial pressure of H2S. In addition, increasing PZ concentration can enhance the absorption capacity of MDEA, as a benchmark alkanolamine, in aqueous and mixed aqueous sulfolane solutions in the low-loading region. A thermodynamic model based on the extended Debye–Hükel theory, namely Deshmukh-Mather model for the liquid phase, combined with the Peng-Robinson equation of state for the gas phase, was applied to correlate the H2S solubility data obtained. The average absolute deviation of the correlated data from the experimental data is 6.5%, which implies good correlative accuracy of the thermodynamic model employed in this work.

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Section: Thermodynamic Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vapor–Liquid Equilibria of H₂S in Aqueous Mixtures of N-Methyldiethanolamine + Piperazine + Sulfolane

Shokouhi¹,

Zoghi²,

Jalili³

et al. 2021

J. Chem. Eng. Data

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“…Sadegh et al. studied solubilities of the H 2 S system in alkanolamines under high pressure. Thermodynamic modeling as developed for absorption of CO 2 in aqueous N‐methyl‐ethanol‐amine using the extended UNIQUAC model for the CO 2 ‐MDEA‐H 2 O system.…”

Section: Process Modelingmentioning

confidence: 99%

“…However, in this article, equilibrium models relating to separation of acid/sour gas components from NG are discussed to show the state-of-art application of thermodynamic properties of different solvents in the separation system (absorber). Sadegh et al [18] studied solubilities of the H 2 S system in alkanolamines under high pressure. Thermodynamic modeling as developed for absorption of CO 2 in aqueous N-methyl-ethanolamine using the extended UNIQUAC model for the CO 2 -MDEA-H 2 O system.…”

Section: Equilibrium Modelsmentioning

confidence: 99%

Mathematical Modeling, Parametric Estimation, and Operational Control for Natural Gas Sweetening Processes

Selvan

Panda

2017

ChemBioEng Reviews

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As a result of the increased energy demand and the required environmental compliance, purification of natural gas (NG) need to be processed through more efficient technologies. Most the NG sources contain H2S and CO2 as acidic contaminants causing corrosion, reduction in the calorific value of the fuel, and toxicity. Removal of these gases (gas sweetening) is mostly performed in a reactive absorber followed by a stripper for solvents regeneration. Amine solvents are very suitable due to their natural affinity towards the acid gases. In the setting‐up of newer plants or retrofitting of old units in existing plants to improve the efficiency of the sweetening process, modeling, optimization, and safer operational control of the process have drawn the attention of many researchers. The development of better models must take into account the synthesis and implementation of proper control strategies. Rate‐based, equilibrium, and kinetic models supported by thermodynamic properties of the components have been discussed here and experiments carried out to identify new process models have also been presented.

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“…The solubility of H 2 S in aqueous solutions of MDEA from 11.9 wt.% to 51 wt.% in the temperature range from 10 • C to 120 • C and H 2 S partial pressure from 0.141 kPa-6900 kPa were studied by various authors [16][17][18][19][20][21][22][23][24][25][26][27]. All the previous studies of aqueous MDEA showed similar trends like increasing the partial pressure of H 2 S (pH 2 S) increases H 2 S loading at given concentration and temperature, while the increase in amine concentration at a given temperature and pH 2 S decreases H 2 S loading.…”

Section: Introductionmentioning

confidence: 99%

Study of Various Aqueous and Non-Aqueous Amine Blends for Hydrogen Sulfide Removal from Natural Gas

2019

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Various novel amine solutions both in aqueous and non-aqueous [monoethylene glycol (MEG)/triethylene glycol(TEG)] forms have been studied for hydrogen sulfide (H2S) absorption. The study was conducted in a custom build experimental setup at temperatures relevant to subsea operation conditions and atmospheric pressure. Liquid phase absorbed H2S, and amine concentrations were measured analytically to calculate H2S loading (mole of H2S/mole of amine). Maximum achieved H2S loadings as the function of pKa, gas partial pressure, temperature and amine concentration are presented. Effects of solvent type on absorbed H2S have also been discussed. Several new solvents showed higher H2S loading as compared to aqueous N-Methyldiethanolamine (MDEA) solution which is the current industrial benchmark compound for selective H2S removal in natural gas sweetening process.

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Solubility of hydrogen sulfide in aqueous solutions of N-methyldiethanolamine at high pressures

Cited by 14 publications

References 15 publications

Vapor–Liquid Equilibria of H₂S in Aqueous Mixtures of N-Methyldiethanolamine + Piperazine + Sulfolane

Vapor–Liquid Equilibria of H₂S in Aqueous Mixtures of N-Methyldiethanolamine + Piperazine + Sulfolane

Mathematical Modeling, Parametric Estimation, and Operational Control for Natural Gas Sweetening Processes

Study of Various Aqueous and Non-Aqueous Amine Blends for Hydrogen Sulfide Removal from Natural Gas

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Solubility of hydrogen sulfide in aqueous solutions of N-methyldiethanolamine at high pressures

Cited by 14 publications

References 15 publications

Vapor–Liquid Equilibria of H2S in Aqueous Mixtures of N-Methyldiethanolamine + Piperazine + Sulfolane

Vapor–Liquid Equilibria of H2S in Aqueous Mixtures of N-Methyldiethanolamine + Piperazine + Sulfolane

Mathematical Modeling, Parametric Estimation, and Operational Control for Natural Gas Sweetening Processes

Study of Various Aqueous and Non-Aqueous Amine Blends for Hydrogen Sulfide Removal from Natural Gas

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Product

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Vapor–Liquid Equilibria of H₂S in Aqueous Mixtures of N-Methyldiethanolamine + Piperazine + Sulfolane

Vapor–Liquid Equilibria of H₂S in Aqueous Mixtures of N-Methyldiethanolamine + Piperazine + Sulfolane