Experimental Determination of the Molecular CO2 Composition in the Liquid Phase of CO2/Alkanolamine/H2O Systems

Sidi-Boumedine, Réda; Provost, Élise; Fürst, Walter

doi:10.1002/1522-2640(200106)73:6<605::aid-cite6052222>3.0.co;2-w

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“…For molecular CO 2 , the calibration has been previously done by Sidi-Boumedine et al The system CO 2 /water has been studied, the dissolved CO 2 concentration being perfectly known from literature or by mass balance. It has been verified that the height of the CO 2 peak is proportional to the molecular CO 2 concentration, up to at least c CO 2 = 0.2 mol·L −1 .…”

Section: Methodsmentioning

confidence: 99%

Influence of Poly(ethylene oxide) 400 (PEG400) on the Absorption of CO₂in Diethanolamine (DEA)/H₂O Systems

Archane¹,

Fürst²,

Provost³

2011

J. Chem. Eng. Data

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An experimental device coupling vaporÀliquid equilibrium (VLE) measurements and liquid phase analysis by Fourier transform infrared (FTIR) spectroscopy has been used to study the absorption of CO 2 in water/diethanolamine (DEA)/ poly(ethylene oxide) 400 (PEG400) systems. The concentration of the molecular form of absorbed CO 2 and the evolution of the carbamate species are measured with the IR spectroscopic method. The partial pressure of carbon dioxide and the liquid phase speciation have been determined at T = 298.1 K for various PEG400 concentrations (with a mass fraction ranging from 0 to 0.3), the mass fraction of DEA being 0.3. At fixed pressure, the CO 2 solubility decreases for increasing PEG400 concentrations, which expresses the decrease in solvent polarity. For a given loading and at constant concentration of DEA, the CO 2 molecular concentration increases with the PEG400 concentration increase, whereas the ion repartition is not significantly influenced by the solvent composition. ' INTRODUCTIONAcid gas absorption is an important step of the natural gas treatment process. It generally involves alkanolamine as the chemical solvent. Most of the new gas sources contain high quantities of acid gases, and the thermodynamics modeling currently used are not accurate enough for a realistic representation of these high loaded systems needed for the optimization of the industrial process. The water/amine/acid gases systems are characterized by the presence of numerous chemical species, most of them being ions. In the case of the water/diethanolamine (DEA, IUPAC name: 2,2 0 -iminoethanol) /CO 2 system, the involved equilibria are the following:Carbon dioxide hydrolysis :Hydrogen carbonate hydrolysis :Carbamate formation : ðC 2 H 5 OHÞ 2 NH þ HCO 3To adjust the parameters of the model, solubility data are generally used. The concentration of the species produced by the reactions between DEA and acid gas can only be calculated by the model, without any assurance about its accordance with real values. Nevertheless, these data are important, especially if the model is used in connection with the representation of the absorption kinetics. Therefore, a realistic model can be obtained only if the database used for the determination of parameters model includes values related to the liquid phase speciation. We wish to present herein the development of an original device that combines a Fourier transform infrared (FTIR) spectroscopy analysis of the liquid phase with a vaporÀliquid equilibrium (VLE) measurement. This kind of apparatus has been used previously for studying water/DEA/CO 2 systems. 1 The major disadvantage of traditional solvents containing water and alkanolamines is the very high energy needed for their regeneration. That is why new solvents are developed by adding a physical solvent to the chemical previous ones. The regeneration energy cost is then lowered. 2 In a previous work, we studied the influence of methanol on the absorption of CO 2 in water/DEA systems. 3 In this work, we wish to extend this type...

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Section: Methodsmentioning

confidence: 99%

Influence of Poly(ethylene oxide) 400 (PEG400) on the Absorption of CO₂in Diethanolamine (DEA)/H₂O Systems

Archane¹,

Fürst²,

Provost³

2011

J. Chem. Eng. Data

Self Cite

View full text Add to dashboard Cite

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Experimental Determination of the Molecular CO2 Composition in the Liquid Phase of CO2/Alkanolamine/H2O Systems

Cited by 1 publication

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Influence of Poly(ethylene oxide) 400 (PEG400) on the Absorption of CO₂in Diethanolamine (DEA)/H₂O Systems

Influence of Poly(ethylene oxide) 400 (PEG400) on the Absorption of CO₂in Diethanolamine (DEA)/H₂O Systems

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Experimental Determination of the Molecular CO2 Composition in the Liquid Phase of CO2/Alkanolamine/H2O Systems

Cited by 1 publication

References 0 publications

Influence of Poly(ethylene oxide) 400 (PEG400) on the Absorption of CO2in Diethanolamine (DEA)/H2O Systems

Influence of Poly(ethylene oxide) 400 (PEG400) on the Absorption of CO2in Diethanolamine (DEA)/H2O Systems

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Influence of Poly(ethylene oxide) 400 (PEG400) on the Absorption of CO₂in Diethanolamine (DEA)/H₂O Systems

Influence of Poly(ethylene oxide) 400 (PEG400) on the Absorption of CO₂in Diethanolamine (DEA)/H₂O Systems