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Dissolution Study of Salt of Long Chain Fatty Acids (Soap Scum) in Surfactant Solutions. Part II: Kinetics of Dissolution
Author(s) -
Soontravanich Sukhwan,
Landrum J. Grant,
Shobe Sarah A.,
Waite Chase M.,
Scamehorn John F.,
Sabatini David A.,
Scheuing David R.
Publication year - 2010
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-010-1209-4
Subject(s) - dissolution , chemistry , kinetics , solubility , pulmonary surfactant , aqueous solution , inorganic chemistry , wetting , salt (chemistry) , nuclear chemistry , chemical engineering , organic chemistry , biochemistry , physics , quantum mechanics , engineering
A study of the dissolution kinetics of soap scum, calcium octadecanoate (Ca(C 18 ) 2 ), by aqueous solutions was carried out by measuring the rate of dissolution of Ca(C 18 ) 2 using a flow cell apparatus. These solutions contained three different types of surfactants: dimethyldodecylamine oxide (DDAO), sodium dodecyl sulfate (SDS), or octyl polyglycoside (C 8 APG), in the presence of a chelating agent, disodium ethylenediaminetetraacetate (Na 2 EDTA). The resulting rate of dissolution corresponds well with the equilibrium solubility obtained in the part I of this series even though the dissolution is rate limited (far from equilibrium). High rates of Ca(C 18 ) 2 dissolution are achieved in solutions of zwitterionic DDAO or nonionic C 8 APG with Na 2 EDTA at high pH. From rate analysis, the Ca(C 18 ) 2 dissolution was found to be surface‐reaction limited rather than limited by solution processes or wettability.