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

研究成果: Conference article

8 引用 (Scopus)


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.

ジャーナルEnergy Procedia
出版物ステータスPublished - 2014 1 1
イベント12th International Conference on Greenhouse Gas Control Technologies, GHGT 2014 - Austin, United States
継続期間: 2014 10 52014 10 9


ASJC Scopus subject areas

  • Energy(all)