Solubility of carbon dioxide in aqueous solutions of amino acid salts

The solubility of CO 2 in aqueous solutions of potassium glycinate was measured in a stirred reactor, at temperatures from 293 to 351 K, for amino acid salt concentrations ranging between 0.1 and 3.0 mol dm - 3 and CO 2 partial pressures up to 6 × 10 4 Pa . CO 2 solubility in potassium threonate 1.0...

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Bibliographic Details
Published in:Chemical engineering science 2009-05, Vol.64 (9), p.1993-2002
Main Authors: Portugal, A.F., Sousa, J.M., Magalhães, F.D., Mendes, A.
Format: Article
Language:English
Subjects:
Absorption
Absorption, stripping
Amino acids
Applied sciences
Carbon dioxide
Chemical engineering
Equilibrium
Exact sciences and technology
Glycine
Reactors
Threonine
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Summary:The solubility of CO 2 in aqueous solutions of potassium glycinate was measured in a stirred reactor, at temperatures from 293 to 351 K, for amino acid salt concentrations ranging between 0.1 and 3.0 mol dm - 3 and CO 2 partial pressures up to 6 × 10 4 Pa . CO 2 solubility in potassium threonate 1.0 mol dm - 3 was also measured at 313 K. It was observed that amino acid salt solutions can be very interesting for CO 2 absorption purposes since they present considerably high absorption capacities. Nevertheless, CO 2 solubility in these solutions does not change significantly for temperatures between 293 and 323 K, which can be a draw back concerning the absorbent regeneration. Potassium glycinate solubility data were interpreted using the thermodynamically sound model proposed by Deshmukh and Mather [1981. A mathematical-model for equilibrium solubility of hydrogen-sulfide and carbon-dioxide in aqueous alkanolamine solutions. Chemical Engineering Science 36 (2), 355–362] and the empirical Kent and Eisenberg [1976. Better data for amine treating. Hydrocarbon Processing 55(2), 87–90] model.
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2009.01.036