Enthalpy of absorption of CO2 with alkanolamine solutions predicted from reaction equilibrium constants

Kim, Inna; Hoff, Karl Anders; Hessen, Erik T.; Haug–Warberg, Tore; Svendsen, Hallvard F.

doi:10.1016/j.ces.2008.12.037

Cited by 141 publications

(87 citation statements)

References 49 publications

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“…The thermal energy required for the regeneration of the solvent in this plant is 410 MW th or 2.83 GJ th /t CO 2 , which is significantly lower than the reported values for the conventional alkanolamines, i.e., 3.5-4 GJ th /t CO 2 depending on the configuration of the capture plant, 85,86 i.e., a 20-30% lower.…”

Section: Cost Evaluationmentioning

confidence: 46%

“…This claim is true when the regeneration enthalpy is the only contribution considered, since the heat of regeneration of ionic liquids is considerably lower (∼2.8 GJ th /t CO 2 ) than that of conventional amines (3.5-4 GJ th / t CO 2 ). 85,86 However, a more detailed study on the total energy requirements shows that, in fact, the electricity, particularly that associated principally to the flue gas compression, imposes a high energy penalty which reduces the efficiency of the power plant from 40% (un-abated) to 28% (abated). Whilst reducing the absorption pressure would reduce the electricity demand of the capture plant, this work indicates that doing so would result in a significant increase in CAPEX.…”

Section: Discussionmentioning

confidence: 99%

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Challenges and opportunities for the utilisation of ionic liquids as solvents for CO₂capture

Mota-Martinez

Brandl

Hallett

et al. 2018

Mol. Syst. Des. Eng.

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Ionic liquids (ILs) have the potential to outperform traditional solvents for CO2 capture, with a great many ILs having been studied to date. In this contribution we present a new approach for their evaluation, and identify which physical properties most infl uence their technical and economic performance. This work highlights a range of potential challenges that ionic liquids will face before they can be applied at process scale, and identifi es some key research opportunities. Ionic liquids have been extensively investigated as promising materials for several gas separation processes, including CO 2 capture. They have the potential to outperform traditional solvents, in terms of their capacity, selectivity, regenerability and stability. In fact, hundreds of ionic liquids have been investigated as potential sorbents for CO 2 capture. However, most studies focus on enhancing equilibrium capacity, and neglect to consider other properties, such as transport properties, and hence ignore the effect that the overall set of properties have on process performance, and therefore on cost. In this study, we propose a new methodology for their evaluation using a range of monetised and non-monetised process performance indices.Our results demonstrate that whilst most research effort is focused on improving CO 2 solubility, viscosity, a transport property, and heat capacity, a thermochemical property, might preclude the use of ionic liquids, even those which are highly CO 2 -philic, and therefore increased effort on addressing the challenges associated with heat capacity and viscosity is an urgent necessity. This work highlights a range of potential challenges that ionic liquids will face before they can be applied at process scale, and identifies some key research opportunities.

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Section: Cost Evaluationmentioning

confidence: 46%

Section: Discussionmentioning

confidence: 99%

Challenges and opportunities for the utilisation of ionic liquids as solvents for CO₂capture

Mota-Martinez

Brandl

Hallett

et al. 2018

Mol. Syst. Des. Eng.

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“…Kim et al [20] predicted the enthalpy of CO 2 absorption into MEA solutions from equilibrium constants and pointed out that the enthalpy decreased with CO 2 loading. Akanksha and Srivastave [2] reported the gas side mass transfer coefficient for the case of countercurrent gas-liquid flow in a falling film microreactor and observed that mass transfer rate strongly depended on gas and liquid flow rates.…”

Section: Introductionmentioning

confidence: 99%

Process Characteristics of CO2 Absorption by Aqueous Monoethanolamine in a Microchannel Reactor

Chen

Yuan

2012

Chinese Journal of Chemical Engineering

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Process characteristics of CO 2 absorption using aqueous monoethanolamine (MEA) in a microchannel reactor were investigated experimentally in this work. A T-type rectangular microchannel with a hydraulic diameter of 408 μm was used. Operating parameters, i.e. temperature, pressure and molar ratio of MEA to CO 2 were studied. Under 3 MPa pressure, the mole fraction of CO 2 in gas phase could decrease from 32.3% to 300×10 −6 at least when gas hourly space velocity ranged from 14400 to 68600 h −1 and molar ratio of MEA to CO 2 was kept at 2.2. In particular, the effects of temperature on CO 2 absorption flux, mass transfer driving force, gas-liquid contact time and enhancement factor were analyzed in detail and found that mass transfer enhancement by chemical reaction was a crucial factor for the process of CO 2 absorption.

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“…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].…”

Section: Introductionmentioning

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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Enthalpy of absorption of CO2 with alkanolamine solutions predicted from reaction equilibrium constants

Cited by 141 publications

References 49 publications

Challenges and opportunities for the utilisation of ionic liquids as solvents for CO₂capture

Challenges and opportunities for the utilisation of ionic liquids as solvents for CO₂capture

Process Characteristics of CO2 Absorption by Aqueous Monoethanolamine in a Microchannel Reactor

Study on the surface tensions of MDEA-methanol aqueous solutions

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Enthalpy of absorption of CO2 with alkanolamine solutions predicted from reaction equilibrium constants

Cited by 141 publications

References 49 publications

Challenges and opportunities for the utilisation of ionic liquids as solvents for CO2capture

Challenges and opportunities for the utilisation of ionic liquids as solvents for CO2capture

Process Characteristics of CO2 Absorption by Aqueous Monoethanolamine in a Microchannel Reactor

Study on the surface tensions of MDEA-methanol aqueous solutions

Contact Info

Product

Resources

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Challenges and opportunities for the utilisation of ionic liquids as solvents for CO₂capture

Challenges and opportunities for the utilisation of ionic liquids as solvents for CO₂capture