Microchannel Extraction Of Butanone Oxime From Aqueous Solution Using Ionic Liquid[Bmim][PF₆]

Aqueous ammonium sulfate solution is usually generated during the synthesis of butanone oxime as a by-product, which may contain a little amount of butanone oxime. To recover butanone oxime from aqueous ammonium sulfate solution, a sustainable and efficient process is required. Compared to the conventional liquid-liquid extractor that has the shortages of low efficiency and large volume, the microfluidics technique with high specific surface area, small volume, easy to scale up and integrate has been evaluated as an attractive alternative. In this dissertation, microchannel extraction of butanone oxime from aqueous solution using ionic liquid is studied. The main contents are as follows:(1)The density and viscosity of experimental systems of water-butanofife oxime-[Bmim] [PF6] and water-butanone oxime-[Bmim] [PF6]-ammonium sulfate were measured at atmosphere pressure and 293.15 K, as well as the distribution coefficient of butanone oxime in ionic liquid -water two phases.(2) User-friendly microchannel extractor is constructed, in which the extraction of butanone oxime from aqueous solution using ionic liquids was researched. The effects of the total flow velocity, water phase flow velocity, ionic liquid phase flow velocity, the volumetric flux ratio of aqueous to ionic liquid phase, the inner diameter of the microchannel, the concentration of butanone oxime on the extraction efficiency and the overall volumetric mass transfer coefficients was investigated in different inlet forms (cross-flow, perpendicula-flow, opposed-flow), to study the mass transfer properties of the microchannel. It was found that the cross-flow was more favorable to mass transfer, compared to the perpendicular-flow and the opposed-flow. An empirical correlation was developed to estimate the overall volumetric mass transfer coefficients.(3)The extraction of butanone oxime from ammonium sulfate aqueous solution using ionic liquids was researched in cross-flow microchannels. The effects of the total flow velocity, water phase flow velocity, ionic liquid phase flow velocity, the volumetric flux ratio of aqueous to ionic liquid phase, the inner diameter of the microchannel, the concentration of butanone oxime and the mass fraction of ammonium sulfate on the extraction efficiency and the overall volumetric mass transfer coefficient were studied, and an empirical correlation was developed to predict the volumetric mass transfer coefficients.(4) The hydrodynamics behavior of water-ionic liquid two phase flow was simulated with Fluent software. The effects of the inner diameter of the microchannel, flow velocity, the volumetric flux ratio of the two phase on the slug size and the circulation frequency were studied. The simulation results are basically consistent with the experimental results.