Salting-out and multivalent cation precipitation of anionic surfactants

Conference · Sun Feb 01 04:00:00 EST 1981 · Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)

OSTI ID:6432530

Walker, Jr, R D; Keppel, R A; Cosper, M B; Funk, J J; Meister, M J

On the basis of the experiments reported here, it appears that both salting-out and multivalent cation precipitation of anionic surfactants are governed by a type of solubility product relationship in the premicellar concentration region, and that the two processes diverge above the CMC owing to different interactions of the cations with the micelles. The Surfactant Precipitation Line (or the Surfactant Salting-Out Line) is intersected by the Surfactant Micellization Line at a point which makes the beginning of the Micellization Saturation Line. This slope appears to depend upon whether or not the cations are selectively bound by the micelles. The common point of intersection represents a Krafft point for the system at the experimental temperature since monomers, micelles and hydrated solid are in equilibrium at that composition. Mixed surfactants behave somewhat differently than pure monoisomeric surfactants owing to selective precipitation of the more insoluble surfactant species and to mixed micelle behavior.

• Research Organization: Univ. of Florida, Gainesville
• DOE Contract Number: AC19-79BC10075
• OSTI ID: 6432530
• Report Number(s): CONF-810308-(Vol.1)
• Conference Information: Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Journal Volume: 26:1
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
023000 -- Petroleum-- Properties & Composition
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CATIONS
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
ENERGY SOURCES
ENHANCED RECOVERY
FLUID INJECTION
FOSSIL FUELS
FUELS
IONS
KINETICS
MICELLAR SYSTEMS
PETROLEUM
PRECIPITATION
REACTION KINETICS
RECOVERY
SALTING-OUT AGENTS
SEPARATION PROCESSES
SURFACTANTS
WATERFLOODING