Salting-out of methane in single-salt solutions at 25°C and below 800 psia

Details Salting-out of methane in single-salt solutions at 25°C and below 800 psia Salting-out of methane in single-salt solutions at 25°C and below 800 psia

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.1327s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Issue 8, pp.1327-1332

Physics

2

Scientific paper

Aqueous solubilities of methane at 25°C have been determined in single-salt solutions equilibrated with a CH 4 gas phase at 350, 550, and 750 psia. Measurements were made over a range of ionic strengths in NaCl, KCl, CaCl 2 , MgCl 2 , Na 2 SO 4 , K 2 SO 4 , MgSO 4 , Na 2 CO 3 , K 2 CO 3 , NaHCO 3 , and KHCO 3 aqueous solutions. At 25°C and constant pressure and methane fugacity, methane solubilities were largely controlled by the stoichiometric ionic strength, I, and the cation of the salt. Except for an increased salting-out due to HCO 3 - , the anion effect was relatively insignificant. Different but consistent solubility trends were followed in monovalent and divalent cation salt solutions as a function of I. Solubilities increased in salt solutions having a common anion in the following cation sequence: Na + < K + << Ca 2+ < Mg 2+ . The molal salting coefficient, k m , for each salt was constant under the experimental conditions of the study, k m is defined by where , the molal activity coefficient, is the methane solubility ratio ( m H 2 O / m salt solution ) measured at constant temperature, pressure, and CH 4 fugacity. Single-salt k m values are as follows: 0.121, NaCl (4m); 0.121, Na 2 SO 4 (1m); 0.118, Na 2 CO 3 (1.5m); 0.146, NaHCO 3 (0.5m); 0.101, KCl (4m); 0.108, K 2 SO 4 (0.5m); 0.111, K 2 CO 3 (2m); 0.145, KHCO 3 (0.5m); 0.071, CaCl 2 (2m); 0.063, MgCl 2 (2m); and 0.066, MgSO 4 (1.5m) where the molalities in parentheses refer to the maximum salt concentrations used in this study.

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