Kinetics and modeling of carbon dioxide absorption into aqueous solutions of piperazine

Absorption of carbon dioxide into piperazine activated aqueous N-methyldiethanolamine

“…It has been observed earlier by Samanta and Bandyopadhyay [37] that for the contactor used for this work the mass transfer resistance to CO 2 absorption is negligible at a gas flow rate above 160 × 10 −6 m 3 s −1 under the conditions of CO 2 partial pressure range and temperature range as used for this study. However, to ensure elimination of the gas phase resistance a volumetric gas flow rate of 180 × 10 −6 m 3 s −1 was maintained throughout all runs of gas absorption measurement.…”

“…Values of the independent equilibrium constants have been found out using reliable correlations presented in Table 2 [30][31][32][33][34][35] and the dependent ones have been estimated by appropriate combination of the independent equilibrium constants. The correlations for the reaction rate constants are also given in Table 2 [36][37][38].…”

Acceleration of the reaction of carbon dioxide into aqueous 2-amino-2-hydroxymethyl-1,3-propanediol solutions by piperazine addition

“…Arrhenius plot of the second-order rate constant k2,PZ as a function of temperature. Samanta and Bandyopadhyay, 2007) suggest that the zwitterion mechanism applies to PZ. However, as PZ has very high secondorder rate constant and pKa (9.68 at 303.15 K; Pagano et al, 1961), the deprotonation of the zwitterion would be very fast and the term in parenthesis of Eq.…”

“…In both cases, very accurate values of the kinetic parameters are necessary in order to get reliable results. However, quite different values of the second order rate constant, k 2,PZ , were found in the above-mentioned studies concerning the CO 2 -piperazine based mixed solvents systems, as well as in the studies concerning the absorption of CO 2 in pure piperazine solutions (Bishnoi and Rochelle, 2000;Derks et al, 2006;Samanta and Bandyopadhyay, 2007;Sun et al, 2005).…”

Liquid heat capacity of the solvent system (piperazine+n-methyldiethanolamine+water)

“…Some of such studies which looked into absorption of carbon dioxide in PZ-activated aqueous alkanolamine solutions are available in the literature [2][3][4][5][6][7][8][9][10][11][12]. Some studies have also demonstrated the benefits of absorbing carbon dioxide in solutions containing (PZ + H 2 O) solvent systems [4,[13][14][15]. The BASF patented the use of PZ-activated aqueous solution of MDEA for more efficient bulk removal of CO 2 in ammonia plants [16].…”