Phase equilibrium of sodium bis(2-ethylhexyl) phosphate/water/n-heptane/sodium chloride microemulsion
- Kyoto Univ. (Japan)
The microemulsion phase diagram for the sodium bis(2-ethylhexyl) phosphate (SDEHP)/water/n-heptane/sodium chloride system is reported. The salinity effects on the phase diagram are discussed in detail. Cylindrical aggregates were found to exist in the oil-rich region and disklike aggregates in the brine-rich region. The middle-phase microemulsion in equilibrium with both the excess brine and oil phases was concluded to be composed of these microstructures. Sodium bis(2-ethylhexyl) phosphate has a common hydrocarbon tail with sodium bis(2-ethylhexyl) sulfosuccinate (AOT), but the phase equilibrium and the structures of the microemulsion phases in SDEHP system were much different from those in the AOT case. The differences were attributed to those in the shapes of aggregates for the two cases.
- OSTI ID:
- 5157404
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:19; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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ALKALI METAL COMPOUNDS
ALKANES
BRINES
CHLORIDES
CHLORINE COMPOUNDS
COLLOIDS
DATA
DISPERSIONS
EMULSIONS
EQUILIBRIUM
ESTERS
EXPERIMENTAL DATA
HALIDES
HALOGEN COMPOUNDS
HEPTANE
HYDROCARBONS
HYDROGEN COMPOUNDS
INFORMATION
MATHEMATICAL MODELS
MICROEMULSIONS
MIXTURES
NUMERICAL DATA
OILS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHASE STUDIES
PHOSPHORIC ACID ESTERS
QUANTITY RATIO
SODIUM CHLORIDES
SODIUM COMPOUNDS
SURFACTANTS
WATER