Thermodynamic model for surfactant adsorption: Topical report. [Decyltrimethylammonium bromide]
A simple, semi-empirical thermodynamic model was constructed for the adsorption of solutions of surfactants onto solid surfaces. Essentially a modified finite-layer BET theory, the model is complete in that it predicts all surface thermodynamic properties. The properties of bulk solutions are considered in an exact way, and the availability of bulk thermodynamic properties is assumed. The theory has been applied satisfactorily to both the adsorption isotherm and the heat of adsorption curve for the adsorption of decyltrimethylammonium bromide (DTAB) on silica gel. In this system, the observed adsorption which occurs above the critical micelle concentration (CMC) depends on the detailed behavior of the bulk thermodynamic properties; since the measured surface properties are sensitive to bulk properties, the latter must be accounted for accurately. DTAB is the only reported surfactant system, for which both the isotherm and the heat have been measured and for which the bulk solution properties are known. A critical test of the theory awaits more data of this type; however, the theory has been tested against isotherms measured by Scamehorn, et al., and has been found to fit within experimental error below the CMC. There are many areas in which the adsorption of surfactants is of practical importance such as minerals processing, lubrication, and enhanced oil recovery. The theory should prove useful to all of these areas. In the scope of enhanced oil recovery, this theory is intended to be developed into an adsorption module for a reservoir simulator for surfactant-mineral systems whose behavior is too complex to be modeled by Henry's law or even a Langmuir isotherm. 15 refs., 6 figs., 2 tabs.
- Research Organization:
- National Inst. for Petroleum and Energy Research, Bartlesville, OK (USA)
- DOE Contract Number:
- FC22-83FE60149
- OSTI ID:
- 6986334
- Report Number(s):
- NIPER-223; ON: DE87001212
- Country of Publication:
- United States
- Language:
- English
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020300* -- Petroleum-- Drilling & Production
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ADSORBENTS
ADSORPTION
ADSORPTION HEAT
ADSORPTION ISOTHERMS
AMINES
AMMONIUM COMPOUNDS
BROMIDES
BROMINE COMPOUNDS
CALORIMETRY
DATA
ENHANCED RECOVERY
ENTHALPY
EXPERIMENTAL DATA
HALIDES
HALOGEN COMPOUNDS
INFORMATION
ISOTHERMS
MATHEMATICAL MODELS
MEDIUM TEMPERATURE
MICELLAR SYSTEMS
NUMERICAL DATA
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
QUATERNARY COMPOUNDS
RECOVERY
SILICA GEL
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SURFACTANTS
THERMODYNAMIC PROPERTIES