13C-NMR study of acid dissociation constant (pKa) effects on the CO 2 absorption and regeneration of aqueous tertiary alkanolamine-piperazine blends

Miho Nitta, Kogoro Hayashi, Yukio Furukawa, Hiroshi Sato, Yasuro Yamanaka

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

    5 Citations (Scopus)

    Abstract

    We have studied the concentration changes of chemical species such as CO 3 2-/HCO 3 -, amine/protonated species, carbonate/protonated species, carbamates/protonated species, etc. in the course of CO 2 absorption and those after CO 2 release upon heating at 93 °C for 30 min for aqueous blends of piperazine (PZ) and each of 11 tertiary alkanolamines using 13C-NMR spectroscopy. The initial rates of CO 2 capture of the blends ranged between 0.125 and 0.167 mol/L min, which were contributed by the rapid formation of PZ monocarbamate. A positive linear correlation was found between the CO 2 release amounts of the blends upon heating and the pKa values of the tertiary alkanolamines. The CO 2 content captured as PZ mono- And biscarbamates decreased upon heating in the pKa range smaller than 9.34, whereas it increased upon heating in the pKa range higher than 9.55. A tertiary alkanolamine having the pKa smaller than 9.34 is promising as a blend amine with PZ.

    Original languageEnglish
    Title of host publicationEnergy Procedia
    PublisherElsevier Ltd
    Pages1863-1868
    Number of pages6
    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

    Alkanolamines
    Nuclear magnetic resonance
    Heating
    Acids
    Amines
    Nuclear magnetic resonance spectroscopy
    Carbonates

    Keywords

    • C-NMR
    • Acid dissociation constant
    • Carbamate
    • Ccs
    • Piperazine
    • Tertiary amine

    ASJC Scopus subject areas

    • Energy(all)

    Cite this

    13C-NMR study of acid dissociation constant (pKa) effects on the CO 2 absorption and regeneration of aqueous tertiary alkanolamine-piperazine blends . / Nitta, Miho; Hayashi, Kogoro; Furukawa, Yukio; Sato, Hiroshi; Yamanaka, Yasuro.

    Energy Procedia. Vol. 63 Elsevier Ltd, 2014. p. 1863-1868.

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

    Nitta, M, Hayashi, K, Furukawa, Y, Sato, H & Yamanaka, Y 2014, 13C-NMR study of acid dissociation constant (pKa) effects on the CO 2 absorption and regeneration of aqueous tertiary alkanolamine-piperazine blends in Energy Procedia. vol. 63, Elsevier Ltd, pp. 1863-1868, 12th International Conference on Greenhouse Gas Control Technologies, GHGT 2014, Austin, United States, 14/10/5. https://doi.org/10.1016/j.egypro.2014.11.194
    Nitta, Miho ; Hayashi, Kogoro ; Furukawa, Yukio ; Sato, Hiroshi ; Yamanaka, Yasuro. / 13C-NMR study of acid dissociation constant (pKa) effects on the CO 2 absorption and regeneration of aqueous tertiary alkanolamine-piperazine blends Energy Procedia. Vol. 63 Elsevier Ltd, 2014. pp. 1863-1868
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    AU - Sato, Hiroshi

    AU - Yamanaka, Yasuro

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    AB - We have studied the concentration changes of chemical species such as CO 3 2-/HCO 3 -, amine/protonated species, carbonate/protonated species, carbamates/protonated species, etc. in the course of CO 2 absorption and those after CO 2 release upon heating at 93 °C for 30 min for aqueous blends of piperazine (PZ) and each of 11 tertiary alkanolamines using 13C-NMR spectroscopy. The initial rates of CO 2 capture of the blends ranged between 0.125 and 0.167 mol/L min, which were contributed by the rapid formation of PZ monocarbamate. A positive linear correlation was found between the CO 2 release amounts of the blends upon heating and the pKa values of the tertiary alkanolamines. The CO 2 content captured as PZ mono- And biscarbamates decreased upon heating in the pKa range smaller than 9.34, whereas it increased upon heating in the pKa range higher than 9.55. A tertiary alkanolamine having the pKa smaller than 9.34 is promising as a blend amine with PZ.

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