Mechanisms for lowering of interfacial tension in alkali/acidic oil systems; Effect of added surfactant

Journal Article · Sat Aug 01 04:00:00 EDT 1992 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00008a010· OSTI ID:6975766

This paper reports that experimental studies are conducted in order to determine the physicochemical mechanism responsible for lowering of interfacial tension in alkali, surfactant, and surfactant-enhanced alkali/acidic oil systems. A well-defined model oil is chosen to examine the influence of various surfactants and surfactant mixtures, such as oleic acid and its ionic counterpart, sodium dodecyl sulfate, petroleum sulfonate, and isobutanol, on equilibrium interfacial tension. With added surfactant alone, the interfacial tension goes through an ultralow minimum with increasing acid concentration. This proves for the first time that the un-ionized acid species plays a major role in affecting interfacial tension, and the ionized acid species.

• OSTI ID: 6975766
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Journal Name: Industrial and Engineering Chemistry Research; (United States) Vol. 31:8; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606 -- Other Materials-- Physical Properties-- (1992-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
ALKALI METALS
ALKYL RADICALS
CARBOXYLIC ACIDS
CONCENTRATION RATIO
DISPERSIONS
DODECYL RADICALS
ELEMENTS
EQUILIBRIUM
ESTERS
INHIBITION
INTERFACES
IONIZATION
ISOBUTYL RADICALS
METALS
MIXTURES
MONOCARBOXYLIC ACIDS
OILS
OLEIC ACID
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PETROLEUM SULFONATES
RADICALS
SODIUM COMPOUNDS
SODIUM SULFATES
SULFATES
SULFONATES
SULFONIC ACID ESTERS
SULFUR COMPOUNDS
SURFACE PROPERTIES
SURFACE TENSION
SURFACTANTS