Phase boundary curves in toluene, 1-butanol, and aqueous sodium alkylbenzenesulfonate systems
Miscibility relationships in systems containing toluene, 1-butanol, water, and sodium alkylbenzenesulfonates are reported. The sulfonates studied included benzene, p-toluene, p-ethylbenzene, 2,4,6-trimethylbenzene, p-cymene, and 2,5-diisopropylbenzene. In a triangular representation with a constant ratio of 1 mol of sulfonate/kg of water as one component, the phase boundary curves are fairly symmetrical with respect to the alcohol apex for S/sub AC/ (number of alkyl carbons on benzene ring of benzene sulfonate) less than 3, but highly asymmetrical for S/sub AC/ greater than 3. The amount of 1-butanol required to produce miscibility decreases with the increasing S/sub AC/ in the aqueous-rich region (> 40% aqueous solution) but increases in the toluene-rich region (> 80% toluene) when S/sub AC/ = 4 and 6. One system, containing sodium 2,5-diisopropylbenzenesulfonate, was studied at eight aqueous solution concentrations at 25/sup 0/C from 0.25 to 3.0 mol of sulfonate/kg of water. Phase relationships for limiting three-component systems were also determined. Under the boundary curves of the system containing 0.50, 1.0, and 1.5 m aqueous solutions, regions with three liquid phases in equilibrium were observed at 25/sup 0/C. The regions of the three coexisting liquid phases varied with changing temperature and composition. Opalescence can be seen at several compositions, especially near the S-shape sector of the phase boundary curves, an observation which, along with low interfacial tension between phases, suggests proximity of critical end points.
- Research Organization:
- Oak Ridge National Lab., TN
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6507918
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 85:10
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
BUTANOLS
PHASE STUDIES
PETROLEUM SULFONATES
TOLUENE
WATER
ENHANCED RECOVERY
INTERFACES
MEDIUM TEMPERATURE
MICROEMULSIONS
SURFACE TENSION
ALCOHOLS
AROMATICS
COLLOIDS
DISPERSIONS
EMULSIONS
ESTERS
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
RECOVERY
SULFONATES
SULFONIC ACID ESTERS
SURFACE PROPERTIES
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
020300 - Petroleum- Drilling & Production