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Experimental studies and modeling of CO 2 solubility in high temperature aqueous CaCl 2 , MgCl 2 , Na 2 SO 4 , and KCl solutions
Author(s) -
Zhao Haining,
Dilmore Robert M.,
Lvov Serguei N.
Publication year - 2015
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14825
Subject(s) - solubility , aqueous solution , chemistry , fugacity , dissolution , salt (chemistry) , saturation (graph theory) , electrolyte , thermodynamics , activity coefficient , phase diagram , inorganic chemistry , analytical chemistry (journal) , phase (matter) , chromatography , organic chemistry , physics , mathematics , electrode , combinatorics
The phase equilibria of CO 2 and aqueous electrolyte solutions are important to various chemical‐, petroleum‐, and environmental‐related technical applications. CO 2 solubility in aqueous CaCl 2 , MgCl 2 , Na 2 SO 4 , and KCl solutions at a pressure of 15 MPa, the temperatures from 323 to 423 K, and the ionic strength from 1 to 6 mol kg −1 were measured. Based on the measured experimental CO 2 solubility, the previous developed fugacity‐activity thermodynamic model for the CO 2 ‐NaCl‐H 2 O system was extended to account for the effects of different salt species on CO 2 solubility in aqueous solutions at temperatures up to 523 K, pressures up to 150 MPa, and salt concentrations up to saturation. Comparisons of different models against literature data reveal a clear improvement of the proposed PSUCO2 model in predicting CO 2 solubility in aqueous salt solutions. © 2015 American Institute of Chemical Engineers AIChE J, 61: 2286–2297, 2015
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