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Solvent extraction of hydrofluosilicic acid with alamine 336
Author(s) -
Stenström Stig,
Wingefors Stig
Publication year - 1986
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450640310
Subject(s) - diluent , solvent extraction , extraction (chemistry) , dissociation constant , solvent , chemistry , acid dissociation constant , inorganic chemistry , chromatography , nuclear chemistry , organic chemistry , aqueous solution , biochemistry , receptor
Extraction constants for the solvent extraction of hydrofluosilicic acid with Alamine 336 have been determined. Two species were identified, (R 3 NH + ) 2 SiF 6 2‐ and R 3 NH + HSiF 6 , whose respective extraction constants were determined to be log K 21 = 7.42 and log K 11 = 2.60. For the dissociation of hydrofluosilicic acid the activity coefficient model presented by Bromley was adapted to sulphuric acid and the values used for hydrofluosilicic acid. The effect of the diluent was experimentally investigated.