The Synergistic Action Between The Ionic Liquids And Alkyl Aryl Sulfonate

Benzene toluene ethylbenzene p-Xylene, caprylyl chloride, decanoyl chloride, lauryl chloride, and n-ethyl bromide, n-butyl bromide, n-hexyl bromide were used as the raw materials ,and by means of molecular designing, nine of alkyl aryl sulfonate isomers were synthesized through the following steps, involving the Friedel-Crafts alkylation reaction, Grignard reaction, and H2 reduction(Pd/C). The products were separated and purified by the thin-layer chromatography and silica gel column chromatography, the optimum developer is the mixed solvent of hexane-carbon tetrachloride-ammonia(3:1:0.2 v/v). Then the structure of the purified products was characterized by IR and 1H NMR and proved as being expected. And the content of surfactant in the products were all over 95% determined by two-phase titration. Then the six kinds of ionic liquids, such as [Bmim]BF4,[Bmim]HCO3,[Bmim]OH,[Dmim]Br,[Tmim]Br,[Hmim]Br, were synthesized through two-step experiment using the bromo-tetradecane, N-methyl imidazole as raw materials. The Tetradecyl bromo imidazole-based ionic liquids was synthesized by microwave radiation and explored the optimum conditions by the response surface analysis methods.Acording the Central Composite experimental design, three-factor five-level response surface analysis was used to research the various factors and their interactions and obtained the optimum condition of the synthesis of the Tetradecyl bromo imidazole-based ionic liquids, which is microwave power for 380.33W, molar ratio of reaction materials: bromotetradecane:N-methyl imidazole=1.04:1, and the reaction time for 427.74S and the main effect relationship of various factors (Y) as follows: molar ratio of reaction materials > reaction time > microwave power. In addition , the quadratic polynomial mathematical model of the relationship between the yield and microwave power X1,molar ratio of reaction materials X2,reaction time X3 was set up and the mathematical model is:Yield=-782.46523-0.18812X1+1468.62457X2+0.38322X3+0.16210X1X2+9.7142910-6X1X3-0.26500X2X3-1.9404910-5X12-620.10822X22-1.2076910-4X32 and the yield of calculated and experimental values is 93.72% and 94.1% respectively. The multiple correlation coefficient between the calculated and experimental values is 0.9959, which shows that the model is reasonable and reliable, and can be used for actual prediction.[Bmim]BF4,[Bmim]HCO3,[Bmim]OH were added to alkylbenzene sulfonate which had clarify structure, and the suface tention of the sulfonate solution was measured in order to study the synergistic action between the ionic liquids and alkylbenzene sulfonate. The result is that: Ionic liquids can interact with different branches of the structure of the alkylbenzene sulfonate and the performance of the surfacatant solutions had been changed: cmc was decreased,γcmc was lower,Γmax was increased,Amin was reduced, pC20 was higher,лwas bigger,⊿ G 0ad was enhanced,In order to study the synergistic action of the ILS for the crude oil - alkylbenzene sulfonate solution interfacial properties ,the interfacial tention was measured. When [Bmim]BF4, [Bmim]HCO3, [Bmim]OH were added to the p3ΦC14S the interfacial tention reduced to 10-2mN/m, and at this time the ionic liquids acted similar with the salt, then as the concentration of ILS increasing, the interfacial tention increased. Meanwhile, the [Bmim]OH was very spcial it's synergistic action was significant. At this time the [Bmim]OH not only acts as the Hydrophobic organic salt but also acts as Cationic surfactant and the alkali action. For the [Dmim]Br,[Tmim]Br and [Hmim]Br, the interfacial tention reduce more, and with the chain length increase the interfacial tention reduce quicklyThe synergistic action of the ionic liquids for the alkylbenzene sulfonate foaming properties was studied and the result showed that when ILS was added, the alkylbenzene sulfonate foaming properties became better, but their foam stability got worse. As the aromatic ring shifted from the edge to the middle of the long carbonic chain, the foaming power of these surfactants became increasing, and the foam stability increased.For the different sulfnates,as the number of aromatic ring substituents increase,the sulfnate foaming power and foam stability increase. When the ILS was added, the height of the foam decreased, and the concentration of the sulfonates solution is higer, the foam height got worse and the foam half-time reduced. With the anion radius of ionic liquid increases, foaming power gradually reduced.The synergistic action of the ionic liquids for alkylbenzene sulfonate emulsifying capacity was also reaserched. The result showed that when ILS was added the emulsifying capacity was improved. Generaly speaking, the concentration of the sulfonate biggest emulsifying capacity is 0.5g/500mL. And then increased the ILS concentration, the emulsifying capacity reduced. For the [Bmim]HCO3, which concentration at 0.5g/500mL, the sulfonate solution emulsifying capacity to octane was bigger than the sulfonate solution containing the [Bmim]BF4, [Bmim]OH. For the emulsifying capacity of sulfonate solution to liquid paraffin, when ILS was added, the emulsifying capacity was strengthened than the absolute sulfonate solution system. While as the concentration of sulfonate increased, the emulsifying capacity reduced. .Meanwhile, when the sulfonate solutions contain the same concentration of three different kinds of ILS respectively, the emulsifying capacity of the system to the liquid paraffin , which containing [Bmim]BF4, is strongest.