resumo
A new high pressure cell was developed to measure the high pressure phase behavior of gas + aqueous salt solutions and validated through the measurement, and comparison against literature data, of two systems, the H2O +CO2 and H2O + CO2 + NaCl, at temperatures up to 363 K and pressures up to 13 MPa. As previously reported by others, a salting out effect on the carbon dioxide solubility in water by NaCl is observed, decreasing its solubility as the salt concentration increases. Electrolyte versions of the cubicplus-association and the RKSA-Infochem equations of state were used to estimate the H2O + CO2 and H2O + CO2 + NaCl phase behavior, with both EoS providing a good representation of the experimental data. (C) 2014 Elsevier B.V. All rights reserved.
palavras-chave
PRESSURE PHASE-BEHAVIOR; PLUS ALCOHOL SYSTEMS; OF-STATE; IONIC LIQUIDS; BINARY-MIXTURES; CO2 SOLUBILITY; WATER-SYSTEM; MULTICOMPONENT SYSTEMS; GAS SOLUBILITY; ACETIC-ACID
categoria
Thermodynamics; Chemistry; Engineering
autores
Carvalho, PJ; Pereira, LMC; Goncalves, NPF; Queimada, AJ; Coutinho, JAP
nossos autores
João Manuel Costa Araújo Pereira Coutinho
Vice-Diretor
Pedro Jorge Marques de Carvalho
Investigador AuxiliarProjectos
Ionic Liquids as Promoters of Aqueous Biphasic Systems: The Role of van der Waals and Coulomb Interactions (PTDC/QUI-QUI/121520/2010)
Centre for Research in Ceramics and Composite Materials - CICECO (LA0011: 2013-2014) (PEst-C/CTM/LA0011/2013)
agradecimentos
The authors acknowledge FEDER funds through the COMPETE operational program, Fundacao para a Ciencia e Tecnologia - FCT through the projects PTDC/QUI-QUI/121520/2010 and PEst-C/CTM/LA0011/2013 and post-doctoral Grant SFRH/BPD/82264/2011 of P.J. Carvalho.