High pressure vapor-liquid equilibria for binary carbon dioxide and protic ionic liquid based on ethanolamines + butanoic acid

Alcantara, Murilo Leite; Carvalho, Marlon Loreno de; Álvarez, Víctor Hugo; Ferreira, Pedro Ícaro dos Santos; Paredes, Márcio Luis Lyra; Cardozo Filho, Lúcio; Silva, Andressa Kuhnen; Liao, Luciano Morais; Pires, Carlos Augusto de Moraes; Silva, Silvana Mattedi e

High pressure vapor-liquid equilibria for binary carbon dioxide and protic ionic liquid based on ethanolamines + butanoic acid

Data

2018

Autores

Alcantara, Murilo Leite

Carvalho, Marlon Loreno de

Álvarez, Víctor Hugo

Ferreira, Pedro Ícaro dos Santos

Paredes, Márcio Luis Lyra

Cardozo Filho, Lúcio

Silva, Andressa Kuhnen

Liao, Luciano Morais

Pires, Carlos Augusto de Moraes

Silva, Silvana Mattedi e

Resumo

High pressure phase equilibria data were measured for 3 protic ionic liquids and CO2. The studied ILs were based on ethanolamine cations and butanoate anions: 2-hydroxyethylammonium butanoate [2HEA][Bu]; N-methyl-2-hydroxyethylammonium butanoate [m-2HEA][Bu] and N-ethyl-2-hydroxyethylammonium butanoate [e−2HEA][Bu]. This ILs were chosen in order to study the effect of the alkyl growth, from central amine, on CO2 solubility. Water content, FT-IR, 1H and 13C NMR analysis were performed on samples. Charge profiles were also estimated by the geometrical and energetic optimization of ILs structures. The data were correlated with three models: Carvalho and Coutinho predictive empirical correlation; Peng-Robinson EoS; Peng-Robinson EoS coupled with Wong-Sandler/NRTL or two parameters mixing rules; Predictive ternary PC-SAFT model. The results showed that the increase of the carbon chain length, bonded to the amine group, promotes higher CO2 solubility at medium-high pressures but lower CO2 solubility at low pressures. Henry's law constants were also compared to other ILs ones.

Citação

ALCANTARA, Murilo L. et al. High pressure vapor-liquid equilibria for binary carbon dioxide and protic ionic liquid based on ethanolamines + butanoic acid. Fluid Phase Equilibria, Amsterdam, v. 460, p. 162-174, 2018. DOI: 10.1016/j.fluid.2017.12.018. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0378381217305022?via%3Dihub. Acesso em: 29 jan. 2024.