title: Tube radial distribution of solvents observed in an aqueous ionic liquid mixed solution delivered into a capillary tube.
abstract: The tube radial distribution of solvents was observed in an aqueous ionic liquid mixed solution of 1-butyl-3-methylimidazolium chloride fed into a capillary tube. A phase diagram was constructed with 1-butyl-3-methylimidazolium chloride and potassium hydroxide, which included boundary curves between homogeneous and heterogeneous solutions at 15 and 20°C. As an example, an aqueous ionic liquid mixed homogeneous solution, comprising the ratio of 1-butyl-3-methylimidazolium chloride:potassium hydroxide (30.5:16.5 wt/wt%), which were positioned near the boundary at 20°C, were delivered into a fused-silica capillary tube (75 μm i.d., 110 cm length, 15°C tube temperature) at a flow rate of 1.0 μL min(-1). The homogeneous solution changed to a heterogeneous solution with two phases: the inner (the aqueous phase merely containing the ionic liquid) and the outer (the ionic liquid-rich) phases, in the capillary tube. The radial distribution of the solvents in the aqueous ionic liquid mixed solution was observed through a bright-light microscope-CCD camera system.
authors.affiliation: Department of Chemical Engineering and Materials Science, Doshisha University, Kyotanabe, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Kawai
authors.forename: Masaharu
authors.initials: M
authors.lastname: Murata
authors.forename: Masahiko
authors.initials: M
authors.lastname: Hashimoto
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Tsukagoshi
mesh_terms: D006878:Hydroxides / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D008853:Microscopy; D017680:Potassium Compounds / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D012996:Solutions; D012997:Solvents / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D006878:Hydroxides; D007093:Imidazoles; D052578:Ionic Liquids; D017680:Potassium Compounds; D012996:Solutions; D012997:Solvents; D014867:Water; C502841:1-butyl-3-methylimidazolium chloride; D012822:Silicon Dioxide; C029943:potassium hydroxide