I. Bernhardsen, Anastasia A. Trollebø, C. Perinu
Jun 19, 2019
Citations
0
Influential Citations
13
Citations
Journal
The Journal of Chemical Thermodynamics
Abstract
Abstract This work studies the potential of using the tertiary amines 3-dimethylamino-1-propanol (3DMA1P), 3-diethylamino-1-propanol (3DEA1P) and 1-(2-hydroxyethyl)pyrrolidine (1-(2HE)PRLD) as an alternative to 2-(diethylamino)ethanol (DEEA) in the blend with 3-(methylamino)propylamine (MAPA). Vapour pressure of the three tertiary amines and vapour-liquid equilibrium (VLE) of the binary mixtures 3DMA1P/H 2 O, 3DEA1P/H 2 O and 1-(2HE)PRLD/H 2 O at T = (353, 363 and 373) K were measured in a modified Swietoslawski ebulliometer. The vapour pressure of the pure amines was fitted to the Antoine equation, and the P - T - x - y data was fitted to NRTL equations. VLE of the CO 2 loaded blended amines were samples at different CO 2 loadings were obtained by NMR spectroscopy. The study showed that the tertiary amines 3DMA1P, 3DEA1P and 1-(2HE)PRLD in the binary amine/H 2 O system were less volatile than DEEA in aqueous solution. The CO 2 loaded blended amines showed comparable VLE behaviour, as well as speciation, and obtained a cyclic capacity higher than that of 30 wt% MEA but similar to most of the blended amines studied in the literature. The overall results indicated that the tertiary amines studied in this work can be used as an alternative to DEEA.