Equilibrium pressure of CO2 over aqueous alkanolamine solutions: A practical view

Mahajani, Vijaykumar V.; Daptardar, S.D.

doi:10.1016/0950-4214(94)80026-x

Cited by 1 publication

(2 citation statements)

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“…This notion is not limited to polymers; aqueous solutions of alkanolamines, such as monoethanolamine and diethanolamine, have been used industrially as absorbents for acidic gases such as CO 2 and H 2 S since the 1930s . These amines absorb CO 2 from gas streams at low temperatures (typically 30−60 °C) and high pressures, and the CO 2 -rich solution is regenerated by desorption of CO 2 at high temperatures (typically 110−130 °C) and low pressures …”

Section: Introductionmentioning

confidence: 99%

“…6 These amines absorb CO 2 from gas streams at low temperatures (typically 30-60 °C) and high pressures, and the CO 2 -rich solution is regenerated by desorption of CO 2 at high temperatures (typically 110-130 °C) and low pressures. 7 There is some disagreement in the literature over the kinetics and precise sequence of reactions between alkanolamines and CO 2 . 8,9 Using a molecular orbital approach, the donor properties and amine-CO 2 interaction for a series of primary amines were modeled, and the following reaction pathway was proposed 10 If the N-C bond in the adduct is sufficiently strong, a proton can be transferred to a second amine functionality and a carbamate salt, a zwitterion, will be formed.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Basic Substituents on Gas Sorption and Permeation in Polysulfone

Ghosal¹,

Chern²,

Freeman³

et al. 1996

Macromolecules

161

113

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The gas permeability, diffusivity, and solubility of a series of polysulfones bearing basic aryl substituents were determined at 35 °C and pressures up to 20 atm. Gas permeability and diffusivity values of the aryl-substituted polysulfones were markedly lower than those of unmodified polysulfone. These effects were ascribed to decreased fractional free volume and increased restriction to sub-T g torsional motion in the substituted polymers. Polysulfone bearing benzylic amine substituents exhibited higher CO2 solubility and CO2/CH4 solubility selectivity than polysulfone, presumably due to favorable interactions between acidic CO2 molecules and basic −CH2-NH2 groups. CO2 diffusivity in polysulfone bearing benzylic amine substituents is lower than expected based on free volume considerations, suggesting that interactions between CO2 and benzylic amine moieties may be strong enough to impede CO2 mobility in the modified polymer. These results are consistent with infrared spectroscopy data which suggest that the benzylic amino groups undergo reversible reaction with CO2 to form carbamate moieties.

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Section: Introductionmentioning

confidence: 99%