Liquid heat capacity of the solvent system (piperazine+2-amino-2-methyl-l-propanol+water)

A Semi-Empirical Model for Estimating the Heat Capacity of Aqueous Solutions of Alkanolamines for CO2 Capture

“…Also, the MAD obtained in this work for the MEA−AMP binary system is ∼0.27%. Similarly, for the PZ− AMP binary system, the AAD obtained in this work for the heat capacity data reported by Chen et al 18 is ∼0.07%, which is smaller than the 0.1% value that they obtained. Also, the MAD obtained in this work for the MEA−AMP is ∼0.39%.…”

“…of the parameters for pure PZ, as well as the inclusion of the data reported by Hilliard15 in the fitting of the parameters for the PZ−H 2 O mixture. Also, the same reason is likely to be responsible for the ∼0.74% AAD in this work and the 0.1% AAD obtained by Chen et al18 for the ternary PZ−AMP−H 2 O system. Similarly, the difference between ∼0.56% AAD obtained in this work and the 0.2% AAD obtained by Chen and Li 8 for the MEA−AMP−H 2 O system can be attributed to the fact that Chen and Li 8 used the parameters obtained by Chiu and Li 14 for the MEA−H 2 O subsystem.The ∼0.90% MAD and 0.2% AAD obtained in this work for the PZ−MEA−H 2 O ternary system are far lower than the 3.93% MAD and 2.84% MAD obtained by Hilliard.…”

“…The heat capacity of aqueous solutions of alkanolamines, whether as a single amine or as blended amines, is a fundamental requirement for the calculation of the heat duty in condensers, heat exchangers, and reboilers. Over the years, experimental heat capacity data have been reported for pure alkanolamines, − binary mixtures of water and alkanolamines, − ,− binary mixtures of two alkanolamines, ,,− and aqueous solutions of mixed alkanolamines. ,,,− Weiland et al reported some heat capacity data for CO 2 -loaded aqueous solutions of MEA, DEA, MDEA, MEA/MDEA blend, and DEA/MDEA blend, at various concentrations of the alkanolamines and for CO 2 loadings up to 0.64 mol mol –1 , but at a fixed temperature of 298.15 K. Similarly, Hilliard reported some heat capacity data for CO 2 -loaded aqueous solutions of MEA with molal concentrations of 3.5 mol kg –1 and 7.0 mol kg –1 , and aqueous solutions of PZ with concentrations of 2.0 mol kg –1 and 3.6 mol kg –1 , for temperatures ranging from 313.15 K to 393.15 K. Hilliard also reported some heat capacity data for CO 2 -loaded aqueous solution blends comprised of 2.0 mol kg –1 of PZ and 3.5 mol kg –1 of MEA, and for blends comprised of 2.0 mol kg –1 of PZ and 7.0 mol kg –1 of MEA, over a temperature range of 313.15–393.15 K.…”

Model development and process simulation of postcombustion carbon capture technology with aqueous AMP/PZ solvent

“…They found values of 66-86 kJ/mol CO 2 depending on solvent loading. Chen et al (2010), studied the liquid heat capacities of different AMP-PZ-H 2 O blends, and generated a great number of experimental values. The following equilibrium reactions are deemed most relevant in the AMP-PZ-H 2 O-CO 2 system (Dash et al, 2011a;Puxty and Maeder, 2013;Tong et al, 2013):…”

“…Excess heat capacity. Regression of the excess heat capacity of the AMP/PZ blend to data by Chen et al (2010) led to a low AAD of 2.5% (Table 5). A parity plot of the fit of this model to the experimental data is given in Appendix D1.…”