A systematic investigation of carbamate stability constants by 1H NMR

A calorimetric study of carbamate formation

“…The determined equilibrium constants (log K) for MEA carbamate formation and carbamate protonation at 298 K of 1.60 ± 0.02 and 7.93 ± 0.07, respectively are in good agreement with our previously determined values at 303 K (1.54 ± 0.02 and 7.49 ± 0.05, respectively [24,25]). The carbamate equilibrium constant is also in good agreement with that from Aroua et al…”

“…The titration was conducted in H 2 O in a 5 mm tube containing an insert with acetone in D 2 O as a reference and lock aid. All other details are as previously described [24,25].…”

Investigations of primary and secondary amine carbamate stability by 1H NMR spectroscopy for post combustion capture of carbon dioxide

“…The pathway (K 9 ) given by equation (3) is much easier to study experimentally, as opposed to K 10 , and hence it is easier to evaluate an equilibrium constant for this reaction (note that equation (3), K 9 , has been the dominant reaction pathway used in the literature for which carbamate stability constants have been reported, and is often designated as K carb [8][9][10][11][12][13][14][15][16][17][18][19][20][21]). By microscopic reversibility, it is possible to calculate values for K 10 , equation (11), by the expression K 10 = K 9 Á K CO2 , with equilibrium data for K CO2 obtained from reference [26].…”

“…Few data are available for comparison, and of the present library of amines, only values for MEA and AP have been reported. The log 10 K 8 for MEA has been reported as 7.49(2) at T = 303 K [19] and 7.93(7) at T = 298 K [20], while that of AP is 8.0(2) at T = 303 K [19]. For MEA, there is also a value for log 10 K 8 of 6.5 at T = 298 K based on kinetic studies [23].…”

Kinetics of Carbon Dioxide with Amines. I. Stopped-Flow Studies in Aqueous Solutions. A Review

“…Kinetic parameters are optimized to reduce deviation between the model and experimental data. This kind of models is necessary when spectrophotometric detection is used to follow the reaction (Barth et al, 1981(Barth et al, , 1983(Barth et al, , 1984(Barth et al, , 1986 or if operating conditions like CO 2 loading is not compatible with an analytical solution of the model (Conway et al, , 2012McCann et al, 2009McCann et al, , 2011Wang et al, 2011;Xiang et al, 2012).…”