Surfactant precipitation and redissolution in brine

Journal Article · Tue Nov 01 04:00:00 EST 1983 · J. Colloid Interface Sci.; (United States)

DOI:https://doi.org/10.1016/0021-9797(83)90021-8· OSTI ID:6144917

Chou, S I; Bae, J H

A model is presented for the precipitation and redissolution of surfactants in brine. At a given CaCl/sub 2/ concentration, increasing the surfactant concentration causes the surfactant to precipitate and further increase of the surfactant concentration causes the precipitate to redissolve. It is found that this process can be described by the solubility product of the precipitate when proper accounts have been made for the surfactant monomer and counterion activities. Expressions are given which describe the thermodynamic equilibrium between surfactant monomers, micelles, and precipitates. Specifically, the flat-plate approximation of the Gouy- Chapman theory of electric double layer has been used to calculate the electrical free energy of micellization as well as the ionic activity coefficients in the presence of charged micelles. Good agreement between theory and experiment is found for the system of sodium dodecylbenzene sulfonate in NaCl and CaCl/sub 2/ brine. 34 references.

• OSTI ID: 6144917
• Journal Information: J. Colloid Interface Sci.; (United States), Journal Name: J. Colloid Interface Sci.; (United States) Vol. 96:1; ISSN JCISA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALKALINE EARTH METAL COMPOUNDS
BRINES
CALCIUM CHLORIDES
CALCIUM COMPOUNDS
CALCIUM HALIDES
CHLORIDES
CHLORINE COMPOUNDS
DISSOLUTION
HALIDES
HALOGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PRECIPITATION
SEPARATION PROCESSES
SOLUBILITY
SOLVATION
SULFONATES
SURFACTANTS