CO2 absorption by biphasic solvents: Mixtures of 1,4-Butanediamine and 2-(Diethylamino)-ethanol

CO2Absorption by Biphasic Solvents: Comparison with Lower Phase Alone

“…As for the reaction products, our previous research has identified the carbon numbers, as shown in Table 6 ( Xu et al, 2013c). The peaks positions of the fresh 2B4D solution NMR spectrum agreed well with those in the literature (Balaban et al, 1985;Parker et al, 2011).…”

“…Our previous works have confirmed the reliability of the screening and titration results (Xu et al, 2012a(Xu et al, , 2013c. Figure 3 shows the cyclic loadings and cyclic capacities of the 2B4D lower phase and (2B4D) L , indicating that the cyclic capacity and cyclic loading of 2B4D and (2B4D) L are very similar.…”

“…The measurement error has been evaluated in previous work and the results proven to be reliable (Xu et al, 2013c). At the rich loading, the BDA, DEEA and CO 2 concentrations in the lower phase were 2.23, 2.40 and 3.29 mol/kg solution, which can be converted to the amine concentration of (2B4D) L by subtracting the weight of CO 2 in the solution.…”

“…Referring to the NMR spectrum for fresh 2B4D solution (Xu et al, 2013c), the BDA and DEEA positions can be easily recognized and the positions of D1, D2, D3, D4, B1 and B2 can be identified in the figure. B3, B4, B5 and B6 represent BDA carbamate, the peak areas of which must be equal and close to those of B1 and B2, so they can also be identified in the spectrum.…”

“…The reaction products of BDA in the two phases were then analyzed. The products was mainly BDA carbamate in the upper phase, while in the lower phase, at a total loading of 0.446 mol/mol amine, the mole fractions of BDA, BDA carbamate and BDA bicarbamate were 16.8%, 55.8% and 27.4% respectively (Xu et al, 2013c). Since most of the CO 2 absorbed existed in the lower phase after absorption, comparison of the alone lower phase and biphasic solvent is necessary to decide which one will be more efficient.…”