Short Carbon Chain Alcohols To Form A Microemulsion Phase Behavior, The Solubilization Its Water / Oil Phase Solubility Studies

This thesis contains four parts. Chapter I, introduction. Chapter II,effects of short chain alcohols on the phase behavior, solubility and solubilization ability of the microemulsion systems CTAB (CPB,C16mimBr)/alcohol/ n-octane / brine. ChapterⅢ, Studies on the solubilities of the short chain alcohols in the microemulsion systems CTAB (CPB,C16mimBr)/1-propanol/ n-octane / brine using the optimum microemulsion dilution method; ChapterⅣ, Compositions of microemulsion systems CTAB(CPB) /1-propanol / n-octane / brine with differentαvalues and the dilution thermodynamics of the systems CTAB /1-propanol / n-octane / brine.ChapterⅠ. IntroductionThe characteristics and application of four kinds of microemulsion phase diagrams: Winsor phase diagram, psedo-ternary phase diagrams, fishlike phase diagram (δ-γandε-βfishlike phase diagrams) andδ-αphase diagram were introduced. The progress in the research of the microemulsion dilution was summerised. The optimum microemusion dilution method was introduced. At last, the main problems remained in the study of microemulsion phase behavior were presented and the contents of this thesis were introduced.ChapterⅡ. Effects of short chain alcohols on the phase behavior, solubility and solubilization ability of the microemulsion systems CTAB (CPB,C16mimBr) /alcohol/ n-octane / brineThe effects of short-chain alcohols on the phase behavior, solubilities and solubilization ability of the microemulson systems CTAB (CPB, C16mimBr) /1-propanol (1-butanol,1-pentanol) /n-octane / brine were investigated with theδ-γandε-βfishlike phase diagrams.1. Alcohols greatly affect the shape of the phase diagrams. The magnitude order of the area of the middle phase region formed by the alcohols with different carbon chain lengthes is 1-propanol >> 1-butanol > 1-pentanol.2. With the carbon chain length becoming shorter, more alcohol molecules are needed to balance the interfacial layer. It can be attributed to that the short-chain alcohol has the weaker ability to adjust the interface curvature, so more alcohol molecules are required to achieve the hydrophile-lipophile balance.3. The surfactant molecures mainly enter into the interface. Part alcohols enter into the interface and constitute the interfacial layer with the surfactant molecures. Another part of alcohols dissolves in aqueous and oleic phases. The order of the alcohols'solubilities is 1-propanol> 1-butanol>1-pentanol.4. The solubilization ability of the microemulsion system is mainly affected by the alcohols and the order is 1-pentanol> 1-butanol> 1-propanol.ChapterⅢ, Studies on the solubilities of the short chain alcohols in the microemulsion systems CTAB(CPB, C16mimBr) )/1-propanol/ n-octane / brine using the optimum microemulsion dilution methodThe solubilities of short chain alcohols in the aqueous(AW)and oleic phases (AO)and the mass fration of alcohols in the interfacial layer (AS) in the microemulsion sysrems CTAB(CPB, C16mimBr)/1-propanol / n-octane / brine were studied using the optimum microemulsion dilution method .1.The values AW, AO and AS of alcohols for CTAB(CPB,C16mimBr)/1-propanol(1-butanol,1-pentanol)/ n-octane /brine(10%NaCl)microemulsion systems, are all decreased along with the increase in the carbon chain length of the alcohols. Especialy AW decreases faster.2. AO , AS and especialy AW values of 1-propanol are all decreased with increasing the salinity for microemulsion systems CTAB/ 1-propanol/n-octane/brine (NaCl:10%,12.5%,15%).3. The solubilities of 1-propanol AW and AO and the mass fraction in the interfacial layer AS are all increased with the increase of the carbon chain length of the alkanes for CTAB/1-propanol/n-hexane(n-octane, n-decane)/brine (10%NaCl) microemulsion systems.4. Along with increasing temperature from 20℃to 60℃, the solubilities of 1-propanol AW and AO as well as the mass fraction AS in the interfaceial layer remain unchanged. that is,temperature has less effect on the solubilities of the microemulsion systems.ChapterⅣ, Compositions of microemulsion systems CTAB(CPB) /1-propanol / n-octane / brine with differentαvalues and the dilution thermodynamics of the systems CTAB /1-propanol / n-octane / brine1. The optimum microemulsion dilution method was used to study the solubilities of 1-propanol AW and AO at differentαvalues in CTAB/1-propanol/n-octane /brine(10%NaCl)microemulsion systems. With increasingαvalues, both AW and AO are increased and the increase of AW is much larger than AO values.2. The content of the alcohol molecules adsorbed in the interfacial layer decreases asαincreases. The short chain alcohols dissolve in aqueous and oleic phases to regulate the polarity of the aqueous and oleic phases to get the hydrophile-lipophile balance.3. The thermodynamics of CTAB/1-propanol/n-octane /brine(15%NaCl)microemulsion systems at 20℃,40℃and 60℃were studied. With temperature increase, the Gibbs free energy changes of n-propanol from the aqueous to the interface and from the oil phase to the interface decrease, which indicates that the rise of temperature is beneficial to the formation of the microemulsion.