An Acid Dissociation Constant (pK_a)-based Screening of Chemical Absorbents that Preferably Capture and Release Pressurized Carbon Dioxide for Greenhouse Gas Control
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We describe an acid dissociation constant (p<I>K</I><SUB>a</SUB>)-based screening of chemical absorbents to treat a gas stream containing carbon dioxide (CO<SUB>2</SUB>) in a wide range of partial pressures (0.1–4 MPa). The solubility differences of CO<SUB>2</SUB> in aqueous amine solutions at 40 and 70 °C plotted against p<I>K</I><SUB>a</SUB> revealed volcano-shaped profiles. The availability of amines with p<I>K</I><SUB>a</SUB> values suitable for capture/release cycles of CO<SUB>2</SUB> with targeted partial pressures shows that the p<I>K</I><SUB>a</SUB>-based screening method would be useful to develop advanced greenhouse gas control technologies.
- Chemistry Letters
Chemistry Letters 37(5), 516-517, 2008-05-05
The Chemical Society of Japan