Effect of methanol addition on water–CO2–diethanolamine system: Influence on CO2 solubility and on liquid phase speciation

Archane, Anas; Gicquel, Laurent; Provost, Élise; Fürst, Walter

doi:10.1016/j.cherd.2008.03.005

Cited by 34 publications

(25 citation statements)

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“…Suda et al, 14 again with 1 H NMR experiments, have published a few experimental points of H 2 OÀMEAÀCO 2 systems, and Jackson et al 15 have published a qualitative study using FT-IR spectroscopy of systems containing MEA, MDEA, or AMP (2-amino-2-methyl-1-propanol), with similar attribution for the various peaks. 3 These speciation data are nevertheless very important, for instance in kinetics modeling, where the driving forces for CO 2 absorption are driven by the concentration of molecular CO 2 at the liquid interface. The presented experimental device is particularly wellsuited for coupled measurements of solubility and liquid phase speciation.…”

Section: ' Conclusionmentioning

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: ' Conclusionmentioning

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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“…Aqueous solutions of MDEA have been widely used for the removal of CO 2 form a variety of gas streams [9,10]. Besides the amine blends, adding a physical solvent to the aqueous solutions of alkanolamines is considered to be an effective method to lower the regeneration energy cost [11,12]. For example, Archane et al [11] studied the vapor-liquid equilibria, the concentration of the molecular form of absorbed CO 2 , the partial pressure of CO 2 and the liquid phase speciation for CO 2 -poly(ethylene oxide)400 (PEG400)-diethanolamine (DEA) aqueous solutions, and demonstrated the influence of PEG400 on the absorption of CO 2 .…”

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Study on the surface tensions of MDEA-methanol aqueous solutions

Wang

et al. 2017

IOP Conf. Ser.: Earth Environ. Sci.

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IntroductionClimate change and environmental problems caused by the emissions of carbon dioxide (CO 2 ) have attracted increasing attentions worldwide and the reduction of CO 2 has become a global issue [1,2]. Post combustion CO 2 capture using amine as absorbent is one of the mature technologies for reducing CO 2 emissions from coal-fired power plants [3][4][5][6][7][8]. Aqueous solutions of MDEA have been widely used for the removal of CO 2 form a variety of gas streams [9,10]. Besides the amine blends, adding a physical solvent to the aqueous solutions of alkanolamines is considered to be an effective method to lower the regeneration energy cost [11,12]. For example, Archane et al.[11] studied the vapor-liquid equilibria, the concentration of the molecular form of absorbed CO 2 , the partial pressure of CO 2 and the liquid phase speciation for CO 2 -poly(ethylene oxide)400 (PEG400)-diethanolamine (DEA) aqueous solutions, and demonstrated the influence of PEG400 on the absorption of CO 2 . Their results showed that lower energy cost can be achieved in regeneration because at a given CO 2 loading and constant concentration of DEA, the CO 2 molecular concentration increases with the increase of PEG400 concentration, whereas the ion repartition is not significantly influenced by the solvent composition. Henni and Mather [13] studied the solubility of CO 2 in a mixed nonaqueous solvent of MDEA and MeOH. The results showed that at low acid gas partial pressures the solubility of CO 2 is higher in the mixed solvent than in pure MeOH. A knowledge of surface tension is required when designing or simulating an absorption column for CO 2 capture. In recent years, there are many experimental and theoretical works concerning the surface tensions of aqueous solutions containing MDEA and physical solvent. Fu et al. [14] measured the surface tensions of PEG400, MEA-PEG400 and DEA-PEG400 aqueous solutions and satisfactorily modeled by using a thermodynamic equation. On the basis of experiments and calculation, they demonstrated the effects of the temperature, the mass fractions of amines and PEG400 on the surface tension. Fu et al. [15] studied the surface tensions of MDEA-piperazine (PZ) aqueous solutions. They proposed a theoretical model to correlate the surface tensions and the calculated results agreed well with

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“…In a recent work, Archane et al 104 used the F€ urst-Renon electrolyte EoS to study the effect of methanol on the CO 2 -water-DEA system. Besides the inclusion of a physical solvent together with an alkanolamine, a novelty in their work was the consideration of both CO 2 solubility and liquid phase speciation data (from IR measurements) in the parameter estimation.…”

Section: Characteristic Applicationsmentioning

confidence: 99%

Models for Electrolyte Systems

Kontogeorgis

Folas

2009

Thermodynamic Models for Industrial Applications

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Mixtures containing strong electrolytes, e.g. salts, or systems with weak electrolytes, e.g. acid gases, are present in many applications and therefore electrolyte thermodynamics is of importance in many contexts and diverse fields such as:. CO 2 and H 2 S removal by absorption using aqueous solutions of alkanolamines and ammonia. . Novel solvents such as ionic liquids. . Pharmaceuticals, amino acids, proteins and other applications in biotechnology. . Corrosion in wet gas pipelines. . Scale formation in oil production and in heat exchangers. . Production of fertilizers using ion exchange and salts.Despite its importance and even the fact that certain aspects are somewhat controversial (e.g. discussion about standard states, measurements of single ion activity coefficients, Lewis-Randal vs. McMillan-Mayer framework), relatively less attention has been given to modeling electrolyte mixtures compared to nonelectrolyte thermodynamics.A review of electrolyte thermodynamics has been presented by Loehe and Donohue 1 , covering theories and models in the period 1985-1997. Prausnitz et al. 2 discussed the fundamentals of electrolyte thermodynamics as well as local composition models also with applications to gas solubility and biotechnology. Local composition models are presented also in the short review by Pinsky and Takano 3 , which includes computational details of a few key activity coefficient models. The recent reviews by Lin et al. 4 and Tan et al. 5 include discussions on electrolyte equations of state, with special emphasis on those combining SAFT theory and electrolyte theories. Finally, the electrolyte chapter in Michelsen and Mollerup 6 contains a full derivation and discussion from a modern perspective of the Debye-H€ uckel theory, as well as standard states and theories for dipolar ions (Kirkwood theory). Full derivatives and computational aspects are also presented.

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Effect of methanol addition on water–CO2–diethanolamine system: Influence on CO2 solubility and on liquid phase speciation

Cited by 34 publications

References 12 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

Study on the surface tensions of MDEA-methanol aqueous solutions

Models for Electrolyte Systems

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Effect of methanol addition on water–CO2–diethanolamine system: Influence on CO2 solubility and on liquid phase speciation

Cited by 34 publications

References 12 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

Study on the surface tensions of MDEA-methanol aqueous solutions

Models for Electrolyte Systems

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Product

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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