Best Microemulsion Dilution Method On Microemulsion Phase Behavior Of Water And Oil Solubility Of Study

This thesis contains four parts, PartⅠ. Progress in study of microemulsion phase behavior using phase diagram; partⅡ. Phase behavior and solubilization of microemulsion system formed by aliphatic polyethenoxy ether(AEO-9) and sodium dodecyl sulfonate(AS); PartⅢ. Study on middle phase microemulsion formed by ionic liquid using optimum microemulsion dilution method; PartⅣ. Effects of interfacial composition on phase behavior of ionic liquid/short-chain alcohol/oil/ brine microemulsion system.PartⅠ. Progress in study of microemulsion phase behavior using phase diagram1. The use and plotting method of Winsor phase diagram were introduced; compared with other phase diagrams, the shortcoming of Winsor phase diagram was also pointed out.2. Pseudo-ternary phase diagram is the most widely used phase diagram for microemulsion, and it is an intersection in tetrahedron phase diagram after fixing the mass ratio of two components.3. The definition and plotting method ofδ-γ"fishlike"phase diagram were introduced exactly, and calculations of physicochemical parameters for microemulsion were also presented.4. The definition and plotting method ofε-β"fishlike"phase diagram were introduced exactly, and superiorities ofε-β"fishlike"phase diagram were also emphasized.5. The necessity and theory ofδ-αphase diagram were introduced; HLB equation was modified in the tetrahedron; the applications ofδ-αphase diagram and HLB equation in microemulsion system were discussed finally.6. Optimum microemulsion method was presented for the first time. The method is more convenient and accurate, and especially applicable for the microemulsion systems containing short-chain alcohol. PartⅡ. Phase Behavior and solubilization of microemulsion system formed by aliphatic polyethenoxy ether (AEO-9) and sodium dodecyl sulfonate (AS)1. AS-AEO-9/alcohl/oil/brine microemulsion systems were studied withδ-γandε-βfishlike phase diagram respectively, and the solubilities of alcohol in water and oil and the composition of water-oil interface were estimated using two different HLB equations. The compositions of two"fishtail"can both be the measurement for solubilizing power of surfactant. The order of the solubilization power is AEO-9:AS(1:3)>AEO-9:AS(1:1)>AS> AEO-9(according toγE values), and AEO-9< AEO-9: AS(1:1) < AEO-9: AS(1:3) < AS (according toβE values). The composition of fishtail in phase diagrams indicate that synergism exists between AS and AE-9.2. Effects of different oil and salinity on phase behavior of microemulsion formed by AS and AEO-9 were discussed and explained.PartⅢ. Study on middle phase microemulsion formed by ionic liquid using optimum microemulsion dilution method1. The geometrical relations of HLB plane in tetrahedron phase diagram were explained, and the theory and experimental procedure of optimum microemulsion dilution method were also described in the pseudo-ternary phase diagram.2. Two dilution equations were deduced according to the distribution of alcohol among water, oil and interface, and the solubilities of alcohol in water and oil can be obtained based on the linear relation in dilution equations.3. The application of optimum microemulsion in ionic liquid/ oil/short-chain alcohol /brine shows that the new method is especially fit for microemulsion systems containing short-chain alcohol.PartⅣ. Correlation between composition of water-oil interface and water/oil ratio in ionic liquid/ short-chain alcohol/oil/brine microemulsion systemIn this section, the optimum microemulsion dilution method was extended and applied to study the correlation between the interfacial composition and water/oil ratio in microemulsion.1. The study on tetrahedron phase diagram of microemulsion shows that it is feasible to extend the optimum microemulsion dilution method to middle phase microemulsion containing unequal amount of water and oil.2. In the mixed surfactant microemulsion system, the relation between theγm value andαvalue can be presented by a parabolic curve, while it is only a curve with maximum in short-chain alcohol/ionic liquid/ hydrocarbon/brine microemulsion system. The change in the latter system was induced by the weaker solubilizing power of short-chain alcohol.3. The solubilities of short-chain alcohol in water and oil increased withαvalue, while the solubilities of short-chain alcohol in water and oil are almost unchanged in mixed surfactant microemulsion system.4. In microemulsion system containing short-chain alcohol, the mass fraction of alcohol in water-oil interface is not increased, but decline with increasingα. The facts manifest that short-chain alcohol has not the ability to change the HLB property as well as surfactant, on the contrary, short-chain alcohol enters and alters the polarity of water and oil, thus enhances the solubilizing power of surfactant.