Method of concentrating fine particle dispersion and method of recovering fine particle
AssigneeJapan Science and Technology Agency
InventorsChiaki Yokoyama, Hitoshi Kasai, Eiji Sarashina, Hiroshi Inomata, Hachiro Nakanishi
Life of this patent
Estimating the term…
Abstract
A method for concentration of fine particles dispersed in a dispersion into an ionic liquid comprising, adding an ionic liquid, especially an organic ionic liquid at ordinary temperature, e.g., a salt of 1-butyl-3-methylimidazolium with PF6− to a dilute dispersion of fine particles so as to concentrate the fine particles into the ionic liquid.
Claims2
A method for recovering fine particles dispersed in an aqueous medium comprising, adding an ionic liquid, which does not dissolve substantially a dispersing aqueous medium, to the aqueous medium containing fine particles and transferring said fine particles from said aqueous medium to the ionic liquid, wherein the amount of the ionic liquid b mL to be added to 10 mL of the aqueous medium containing said fine particles by a mM dispersing concentration is in the range so as the ratio a/b is 0.05≦a/b<1.0,and wherein said ionic liquid is an organic ionic liquid selected from the group consisting of compounds represented by following formulae 1,
- wherein, R3 and R4 are an alkyl group of carbon number 1-7, n is an interger of 1-3, R1 is an alkyl group which can possess a substitution group of carbon number 1-7, X− is selected from the group consisting of NO3−, (CF3SO3)2N−, TFSI−, Cl− and SO3H−.
Dependencies are inferred from the claim text.