Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Letter
An Acid Dissociation Constant (pKa)-based Screening of Chemical Absorbents that Preferably Capture and Release Pressurized Carbon Dioxide for Greenhouse Gas Control
Kin-ya TomizakiShinkichi ShimizuMasami OnodaYuichi Fujioka
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2008 Volume 37 Issue 5 Pages 516-517

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Abstract

We describe an acid dissociation constant (pKa)-based screening of chemical absorbents to treat a gas stream containing carbon dioxide (CO2) in a wide range of partial pressures (0.1–4 MPa). The solubility differences of CO2 in aqueous amine solutions at 40 and 70 °C plotted against pKa revealed volcano-shaped profiles. The availability of amines with pKa values suitable for capture/release cycles of CO2 with targeted partial pressures shows that the pKa-based screening method would be useful to develop advanced greenhouse gas control technologies.

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© 2008 The Chemical Society of Japan
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