Preparation And Application Of Task-specific Ionic Liquid Microemulsion

Microemulsion is a kind of dispersion formed by two immiscible liquids, which isthermodynamic stability, isotropy, translucent in appearance, and its particle size is form10nmto100nm. Microemulsion is applied to prepare tertiary oil, cosmetics and cellular material.Task-specific ionic liquids have some functional groups in cation or anion for specificpurposes, so the selectivity and specific application are strengthened by functional groups.When amphipathy of task-specific ionic liquids is adjusted via changing the cation and theanion, some component of microemulsion is replaced with task-specific ionic liquids, formingthe task-specific ionic liquids microemulsion.In this paper, three task-specific ionic liquids microemulsion were prepared with water,Triton X-100, n-butanol, cyclohexane and three task-specific ionic liquids. Those threetask-specific ionic liquids synthesized by ourselves are [NH2ebim][BF4],[NH2ebim][PF6],[NH2ebim]Br, respectively. Ternary phase diagrams were drawed, and microemulsion typeswere determined by the analysis of conductivity and the measurement of droplet sizedistribution. The effects of the temperature and the proportion of surfactant and cosurfactanton the microemulsion region were investigated. The states of water in the microemulsion wasstudied when methyl orange was used as tracer agent. The interaction of component wasstudied by dissipative particle dynamics. CO2was absorbed by the spontaneous emulsionformed by task-specific ionic liquids microemulsion with5%MEDA. The effects of operatingparameters, such as temperature, rotate speed of stirrer, mass of task-specific ionic liquids anddifferent task-specific ionic liquids, on the absorption rate of CO2were investigated. Theexperimental results have been shown as follows: water/[NH2ebim][BF4]/Triton X-100/n-butanol/cyclohexane microemulsion water/[NH2ebim][PF6]/Triton X-100/n-butanol/cycl-ohexane microemulsion and water/[NH2ebim] Br/Triton X-100/n-butanol/cyclohexanemicroemulsion have been prepared. The ternary phase diagrams of three task-specific ionicliquids microemulsions have been divided into two phase region and single phase region(microemulsion region), and microemulsion region is divided into W/O, bicontinuous phase,and O/W microemulsion. Microemulsion area increase with the increase of temperature, anddecrease with the increase of the proportion of surfactant and cosurfactant. The results of DPD simulation indicate that [NH2ebim]Br is incline to be present in water phase,[NH2ebim][PF6]and [NH2ebim][BF4] incline to be present in interface layer. The states of water intask-specific ionic liquid microemulsion, including trapped water, bound water and free water.Spontaneous emulsion is formed by task-specific ionic liquids microemulsion whose dropletsize of emulsion are form100nm-1000nm. Spontaneous emulsion with5%MEDA is used asabsorption solvent to absorb CO2. The absorption rate of CO2has been enhanced byspontaneous emulsion. The absorption rates of CO2increase with the decrease of operatingtemperature, the increase of stirring speeds, and the increase of the mass ratio of thespontaneous microemulsion. Among those three spontaneous emulsions, the absorption rate of[NH2ebim] Br spontaneous emulsion is the highest.