2026-05-05T18:38:06Zhttps://uvadoc.uva.es/oai/request

oai:uvadoc.uva.es:10324/839452026-04-07T19:19:32Zcom_10324_31661com_10324_952com_10324_894col_10324_31662

Solubility measurements of carbon dioxide and nitrous oxide in an aqueous mixture of 2-dimethylaminoethanol and N-methyl-1,3-propanediamine Arroyave Roa, Juan Diego Moreau Ortega, Alejandro Paredes Mendez, Xavier Velez Jaramillo, Jhon Fredy Martín Trusler, J.P. Martín González, María del Carmen Aqueous monoethanolamine (MEA) is a mature post-combustion CO2 capture technology, but it faces significant drawbacks including corrosivity, high regeneration energy (∼4 GJ/t-CO2), and reactivity with contaminants. This study investigates an aqueous blend of 2-Dimethylaminoethanol (DMAE, 30% wt.) and N-Methyl-1,3-propanediamine (MAPA, 10% wt.) as an alternative solvent to capture CO2. Given the scarcity of Vapour-Liquid Equilibrium (VLE) data for such amine blends, this research aims to expand the thermodynamic understanding of this specific aqueous DMAE + MAPA system. We thoroughly investigate its VLE with CO2 and N2O across temperatures between (313.15–393.15) K. The physical solubility of CO2 was determined using the N2O/CO2 analogy. N2O solubility measurements were conducted in a monobloc equilibrium cell from 1 to 5 MPa. The expanded relative uncertainty of the N2O solubility, expressed in molality, was estimated to be 0.8% (k = 2). Henry's constants were derived using Krichevsky-Ilinskaya analysis and CO2 solubility was determined using a static-isochoric Van Ness-type apparatus over 313.15–363.15 K and up to 7 MPa with a relative uncertainty of ur(αexp) = (0.3–5) %. Finally, speciation profiles and the heat of CO2 absorption were predicted using established thermodynamic models optimized for this system. 2026-04-07T12:32:36Z 2026-04-07T12:32:36Z 2026-04-07T12:32:36Z 2026 info:eu-repo/semantics/article The Journal of Chemical Thermodynamics, 2026, vol. 217, p. 107675 0021-9614 https://uvadoc.uva.es/handle/10324/83945 10.1016/j.jct.2026.107675 107675 The Journal of Chemical Thermodynamics 217 eng https://www.sciencedirect.com/science/article/pii/S0021961426000522 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ © 2026 The Author(s) Atribución 4.0 Internacional Elsevier