Experimental evaluation of effect of oxidative degradation of aqueous monoethanolamine on heat of CO 2 absorption, vapor liquid equilibrium and CO 2 absorption rate

Takao Nakagaki, Ippei Tanaka, Yukio Furukawa, Hiroshi Sato, Yasuro Yamanaka

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    3 Citations (Scopus)

    Abstract

    Oxidative degradation produces carboxylic acids which are one of the undesirable degradation products and may have a negative impact on the CO 2 separation energy of post combustion capture system. 30wt% MEA solutions mixed with carboxylic acids were regarded as a simulated solution for degraded MEA and effect of the additives on heat of CO 2 absorption, equilibrium CO 2 loading and CO 2 absorption rate were experimentally evaluated by using a differential reaction calorimetry (DRC) apparatus, a pressurized vessel to obtain vapor liquid equilibrium (VLE) data and a gas-liquid contactor, respectively. At the range of CO 2 loading from 0.0 to 0.3 mol-CO 2/mol-amine, the heat of CO 2 absorption of the simulated solution increased by around 10% compared to the normal MEA solution. Moreover, the changing-point of the heat of CO 2 absorption of the simulated solution moved to a leanerCO 2 loading compared to the normal solution. Result of a 13C-NMR analysis also indicated the change in reaction mechanism. At the absorber condition, the equilibrium CO 2 loading of the simulated solution decreased by 20% in comparison with the normal solution, where it decreased by 10% at the stripper condition and therefore the cyclic CO 2 loading also decreased. Both CO 2 absorption rates decreased linearly but in different gradients with increasing CO 2 loading. Higher pH in the simulated solution kept higher CO 2 absorption rate, which is consistent with the result of pH measurement.

    Original languageEnglish
    Title of host publicationEnergy Procedia
    PublisherElsevier Ltd
    Pages2384-2393
    Number of pages10
    Volume63
    DOIs
    Publication statusPublished - 2014
    Event12th International Conference on Greenhouse Gas Control Technologies, GHGT 2014 - Austin, United States
    Duration: 2014 Oct 52014 Oct 9

    Other

    Other12th International Conference on Greenhouse Gas Control Technologies, GHGT 2014
    CountryUnited States
    CityAustin
    Period14/10/514/10/9

    Fingerprint

    Phase equilibria
    Degradation
    Carboxylic acids
    Hot Temperature
    Calorimetry
    Amines
    Nuclear magnetic resonance
    Liquids
    Gases

    Keywords

    • Absorption rate
    • Carboxylic acids
    • DRC
    • HEA
    • Heat of CO absorption
    • HEF
    • VLE

    ASJC Scopus subject areas

    • Energy(all)

    Cite this

    Experimental evaluation of effect of oxidative degradation of aqueous monoethanolamine on heat of CO 2 absorption, vapor liquid equilibrium and CO 2 absorption rate . / Nakagaki, Takao; Tanaka, Ippei; Furukawa, Yukio; Sato, Hiroshi; Yamanaka, Yasuro.

    Energy Procedia. Vol. 63 Elsevier Ltd, 2014. p. 2384-2393.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Nakagaki, T, Tanaka, I, Furukawa, Y, Sato, H & Yamanaka, Y 2014, Experimental evaluation of effect of oxidative degradation of aqueous monoethanolamine on heat of CO 2 absorption, vapor liquid equilibrium and CO 2 absorption rate in Energy Procedia. vol. 63, Elsevier Ltd, pp. 2384-2393, 12th International Conference on Greenhouse Gas Control Technologies, GHGT 2014, Austin, United States, 14/10/5. https://doi.org/10.1016/j.egypro.2014.11.260
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    abstract = "Oxidative degradation produces carboxylic acids which are one of the undesirable degradation products and may have a negative impact on the CO 2 separation energy of post combustion capture system. 30wt{\%} MEA solutions mixed with carboxylic acids were regarded as a simulated solution for degraded MEA and effect of the additives on heat of CO 2 absorption, equilibrium CO 2 loading and CO 2 absorption rate were experimentally evaluated by using a differential reaction calorimetry (DRC) apparatus, a pressurized vessel to obtain vapor liquid equilibrium (VLE) data and a gas-liquid contactor, respectively. At the range of CO 2 loading from 0.0 to 0.3 mol-CO 2/mol-amine, the heat of CO 2 absorption of the simulated solution increased by around 10{\%} compared to the normal MEA solution. Moreover, the changing-point of the heat of CO 2 absorption of the simulated solution moved to a leanerCO 2 loading compared to the normal solution. Result of a 13C-NMR analysis also indicated the change in reaction mechanism. At the absorber condition, the equilibrium CO 2 loading of the simulated solution decreased by 20{\%} in comparison with the normal solution, where it decreased by 10{\%} at the stripper condition and therefore the cyclic CO 2 loading also decreased. Both CO 2 absorption rates decreased linearly but in different gradients with increasing CO 2 loading. Higher pH in the simulated solution kept higher CO 2 absorption rate, which is consistent with the result of pH measurement.",
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    AU - Nakagaki, Takao

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    AU - Furukawa, Yukio

    AU - Sato, Hiroshi

    AU - Yamanaka, Yasuro

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    N2 - Oxidative degradation produces carboxylic acids which are one of the undesirable degradation products and may have a negative impact on the CO 2 separation energy of post combustion capture system. 30wt% MEA solutions mixed with carboxylic acids were regarded as a simulated solution for degraded MEA and effect of the additives on heat of CO 2 absorption, equilibrium CO 2 loading and CO 2 absorption rate were experimentally evaluated by using a differential reaction calorimetry (DRC) apparatus, a pressurized vessel to obtain vapor liquid equilibrium (VLE) data and a gas-liquid contactor, respectively. At the range of CO 2 loading from 0.0 to 0.3 mol-CO 2/mol-amine, the heat of CO 2 absorption of the simulated solution increased by around 10% compared to the normal MEA solution. Moreover, the changing-point of the heat of CO 2 absorption of the simulated solution moved to a leanerCO 2 loading compared to the normal solution. Result of a 13C-NMR analysis also indicated the change in reaction mechanism. At the absorber condition, the equilibrium CO 2 loading of the simulated solution decreased by 20% in comparison with the normal solution, where it decreased by 10% at the stripper condition and therefore the cyclic CO 2 loading also decreased. Both CO 2 absorption rates decreased linearly but in different gradients with increasing CO 2 loading. Higher pH in the simulated solution kept higher CO 2 absorption rate, which is consistent with the result of pH measurement.

    AB - Oxidative degradation produces carboxylic acids which are one of the undesirable degradation products and may have a negative impact on the CO 2 separation energy of post combustion capture system. 30wt% MEA solutions mixed with carboxylic acids were regarded as a simulated solution for degraded MEA and effect of the additives on heat of CO 2 absorption, equilibrium CO 2 loading and CO 2 absorption rate were experimentally evaluated by using a differential reaction calorimetry (DRC) apparatus, a pressurized vessel to obtain vapor liquid equilibrium (VLE) data and a gas-liquid contactor, respectively. At the range of CO 2 loading from 0.0 to 0.3 mol-CO 2/mol-amine, the heat of CO 2 absorption of the simulated solution increased by around 10% compared to the normal MEA solution. Moreover, the changing-point of the heat of CO 2 absorption of the simulated solution moved to a leanerCO 2 loading compared to the normal solution. Result of a 13C-NMR analysis also indicated the change in reaction mechanism. At the absorber condition, the equilibrium CO 2 loading of the simulated solution decreased by 20% in comparison with the normal solution, where it decreased by 10% at the stripper condition and therefore the cyclic CO 2 loading also decreased. Both CO 2 absorption rates decreased linearly but in different gradients with increasing CO 2 loading. Higher pH in the simulated solution kept higher CO 2 absorption rate, which is consistent with the result of pH measurement.

    KW - Absorption rate

    KW - Carboxylic acids

    KW - DRC

    KW - HEA

    KW - Heat of CO absorption

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