Functionalized ionic liquid containing a phosphorus and oxygen structure, and preparation method and application thereof

Abstract

The invention relates to functionalized ionic liquid containing a phosphorus and oxygen structure with a general formula of A+ B-, which is characterized in that A+ is shown in a formula (I), and R 1 and R 2 are defined in the specification; and B- is Cl-, Br-, I -, BF4-, PF6-, NO3-, CF3SO3-, [(CF3SO2) 2N] - or CH3CO2-. The invention also relates to a method for preparing ionic liquid with the formula of A + B-, which comprises the following steps: a compound in a formula (III) is reacted with a compound in a formula (II ') to obtain a compound in a formula (II'') , and then a compound in a formula (II'') is reacted with a compound in a formula (IV) to obtain a halide ionic liquid A + B-, wherein B- is Cl-, Br-or I-, and ionic liquids with the other anions can be obtained by carrying out the ion exchange of the halide ionic liquid. The invention also relates to application of the ionic liquids in extraction of uranium from uranium-containing water systems. HO-(CH2) nCH2-X (III).

Description

technical field The invention relates to an imidazole-type ionic liquid, in particular to a functionalized ionic liquid (TSILs, Task Specific Ionic Liquids or FILs, Functionalized Ionic Liquids) containing phosphorus and oxygen structures. The present invention also relates to the preparation method of the aforementioned ionic liquid and the application of the ionic liquid, especially the application of extracting uranium in the uranium-containing water system. Background technique Compared with traditional organic solvents and electrolytes, ionic liquids have a series of outstanding advantages: (1) almost no vapor pressure, non-volatile, colorless, and odorless; (2) have a larger stable temperature range and better chemical stability (3) The solubility of inorganic substances, organic substances and polymers can be adjusted through the design of anions and cations. Due to the above excellent properties, it is regarded as a "green" solvent, which can replace the conventiona...

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Problems solved by technology

With conventional alkylimidazole hydrophobic room temperature ionic liquids such as [C 8 mim][PF 6 ] or [C 4 mim][PF 6 ] as a diluent, compounded with uranium extractant tributyl phosphate (TBP) to extract uranium in uranium-containing water system, which can obtain higher extraction efficiency ([2]P.Giridhar, K.A.Venkatesan, T.G.Srinivasan. P.R.Vasudeva Rao, Journal of Radioanalytical and Nuclear Chemistry, 2005, 265, 31-38), but there is a problem that the extraction system produces three phases, which hinders the smooth progress of the extraction process

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