Methanol micellar solubilization

SCHWAB AND PRYDE Micellar Solubilization of Methanol and Triglycerides 285... 

The column effluent was collected in 0.20 pore volume increments by a Spectra/Chrom fraction collector. The column effluent was categorized as one of the following liberated free phase hexadecane, micellarly solubilized hexadecane, or microemulsified middle phase hexadecane. One column effluent sample contained all three phases, where the micellarly solubilized hexadecane was the most dense bottom phase, free phase hexadecane was the least dense top phase, with the microemulsified middle phase in between. Effluent samples of liberated free phase hexadecane were separated from both micellarly solubilized hexadecane and microemulsified middle phase hexadecane, and subsequently quantified with a graduated vial to within 0.01 ml. Micellarly solubilized hexadecane was separated from microemulsified middle phase hexadecane, and both were diluted with methanol to a concentration below 500 mg/L which is in the linear region of the Varian 3300 GC using split injection and FID detection. 

Micellar and pre-micellar solutions of methanol in triolein were studied with three different surfactant systems using 2-octanol as a co-surfactant. Surfactants evaluated by viscosity, conductivity, density, refractive index and particle size data along with polarizing microscopic examinations were bis(2-ethylhexyl) sodium sulfosuccinate, triethylammonium linoleate and tetradecyldimethylammonium linoleate. Data show phase equilibria regions of liquid crystalline phases as well as micellar solutions. All systems were effective for solubilizing methanol in triolein. The order of effectiveness for water tolerance is Tetradecyldimethylammonium linoleate>... 

The literature studies on the effect of n-alcohols on the aggregation number, n, of ionic surfactants have recently been discussed by Backlund et al. [138]. The data suggest that water soluble alcohols (methanol to butanol) are predominantly dissolved in the water phase and may increase or decrease the aggregation number depending on the alcohol concentration. Moderately soluble alcohols (pentanol, hexanol) are distributed between the aqueous and micellar phases and at low concentrations may increase n. Sparingly soluble alcohols such as heptanol and octanol are almost entirely solubilized in the micelles and thereby increase n. 

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