13C-NMR study of acid dissociation constant (pKa) effects on the CO2 absorption and regeneration of aqueous tertiary alkanolamines

Kogoro Hayashi; Yukio Furukawa; Hiroshi Sato; Yasuro Yamanaka

doi:10.1016/j.egypro.2014.11.196

¹³C-NMR study of acid dissociation constant (pKa) effects on the CO₂ absorption and regeneration of aqueous tertiary alkanolamines

Kogoro Hayashi, Yukio Furukawa^*, Hiroshi Sato, Yasuro Yamanaka

^*Corresponding author for this work

School of Advanced Science and Engineering

Research output: Contribution to journal › Conference article › peer-review

11 Citations (Scopus)

Abstract

We have studied the formation rates of chemical species such as ^2-/HCO₃ ^-, amine/protonated amine, and carbonate/protonated carbonate in the course of CO₂ absorption at room temperature and concentration changes after CO₂ release upon heating at 93 °C for 30 min for aqueous solutions of 12 kinds of tertiary alkanolamines using ¹³C-NMR spectroscopy. A positive linear correlation was found between the CO₂ capture rates of alkanolamines having a normal hydroxyalkyl group and their pKa values. The CO₂ capture rates of alkanolamines having a branched hydroxyalkyl group were lower than those in this relationship. The CO₂ release amount of each tertiary amine increased with decreasing pKa, as a general trend. Nethyldiethanolamine (EDEA) showed the largest CO₂ release amount and a moderately high rate of CO₂ absorption.

Original language	English
Pages (from-to)	1876-1881
Number of pages	6
Journal	Energy Procedia
Volume	63
DOIs	https://doi.org/10.1016/j.egypro.2014.11.196
Publication status	Published - 2014
Event	12th International Conference on Greenhouse Gas Control Technologies, GHGT 2014 - Austin, United States Duration: 2014 Oct 5 → 2014 Oct 9

Keywords

Acid dissociation constant
C-NMR
Ccs
Tertiary amine

ASJC Scopus subject areas

Energy(all)

Access to Document

10.1016/j.egypro.2014.11.196

Cite this

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title = "13C-NMR study of acid dissociation constant (pKa) effects on the CO2 absorption and regeneration of aqueous tertiary alkanolamines",

abstract = "We have studied the formation rates of chemical species such as 2-/HCO3 -, amine/protonated amine, and carbonate/protonated carbonate in the course of CO2 absorption at room temperature and concentration changes after CO2 release upon heating at 93 °C for 30 min for aqueous solutions of 12 kinds of tertiary alkanolamines using 13C-NMR spectroscopy. A positive linear correlation was found between the CO2 capture rates of alkanolamines having a normal hydroxyalkyl group and their pKa values. The CO2 capture rates of alkanolamines having a branched hydroxyalkyl group were lower than those in this relationship. The CO2 release amount of each tertiary amine increased with decreasing pKa, as a general trend. Nethyldiethanolamine (EDEA) showed the largest CO2 release amount and a moderately high rate of CO2 absorption.",

keywords = "Acid dissociation constant, C-NMR, Ccs, Tertiary amine",

author = "Kogoro Hayashi and Yukio Furukawa and Hiroshi Sato and Yasuro Yamanaka",

note = "Publisher Copyright: {\textcopyright} 2014 The Authors Published by Elsevier Ltd.; 12th International Conference on Greenhouse Gas Control Technologies, GHGT 2014 ; Conference date: 05-10-2014 Through 09-10-2014",

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T1 - 13C-NMR study of acid dissociation constant (pKa) effects on the CO2 absorption and regeneration of aqueous tertiary alkanolamines

AU - Hayashi, Kogoro

AU - Furukawa, Yukio

AU - Sato, Hiroshi

AU - Yamanaka, Yasuro

PY - 2014

Y1 - 2014

N2 - We have studied the formation rates of chemical species such as 2-/HCO3 -, amine/protonated amine, and carbonate/protonated carbonate in the course of CO2 absorption at room temperature and concentration changes after CO2 release upon heating at 93 °C for 30 min for aqueous solutions of 12 kinds of tertiary alkanolamines using 13C-NMR spectroscopy. A positive linear correlation was found between the CO2 capture rates of alkanolamines having a normal hydroxyalkyl group and their pKa values. The CO2 capture rates of alkanolamines having a branched hydroxyalkyl group were lower than those in this relationship. The CO2 release amount of each tertiary amine increased with decreasing pKa, as a general trend. Nethyldiethanolamine (EDEA) showed the largest CO2 release amount and a moderately high rate of CO2 absorption.

AB - We have studied the formation rates of chemical species such as 2-/HCO3 -, amine/protonated amine, and carbonate/protonated carbonate in the course of CO2 absorption at room temperature and concentration changes after CO2 release upon heating at 93 °C for 30 min for aqueous solutions of 12 kinds of tertiary alkanolamines using 13C-NMR spectroscopy. A positive linear correlation was found between the CO2 capture rates of alkanolamines having a normal hydroxyalkyl group and their pKa values. The CO2 capture rates of alkanolamines having a branched hydroxyalkyl group were lower than those in this relationship. The CO2 release amount of each tertiary amine increased with decreasing pKa, as a general trend. Nethyldiethanolamine (EDEA) showed the largest CO2 release amount and a moderately high rate of CO2 absorption.

KW - Acid dissociation constant

KW - C-NMR

KW - Ccs

KW - Tertiary amine

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