A kind of ionic liquid and its application
An ionic liquid and concentration technology, which is used in solvent extraction of liquid solutions, compounds of elements in Group 4/14 of the periodic table, chemical instruments and methods, etc. and reproducibility, affecting extraction stability, etc., to achieve the effect of eliminating matrix interference, easy industrial production, and high viscosity
Active Publication Date: 2016-06-22
YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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Problems solved by technology
It was found that due to the ionic liquid [C 8 MIM][PF 6 ] has a certain solubility in water, and the enrichment efficiency is low when the submerged single-drop microextraction technique is used; at the same time, in the headspace single-drop microextraction technique, since the extraction process needs to stir the sample solution, the ionic liquid [C 8 MIM][PF 6 ] The viscosity is small, and the droplets are easy to fall off, which affects the stability and reproducibility of the extraction
In addition, when ILs-LPME is coupled with gas chromatography (ZhaoF., LiJ., ZengB., J.Sep.Sci.2008, 31:3045-3049), the thermal desorption temperature of the injection port should not be too high to avoid the high temperature of the ionic liquid Under the decomposition, affecting the stability of the extraction
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Embodiment 1
[0034] A method for preparing ionic liquid, the specific synthetic method is as follows:
[0035] (1) Synthesis of benzyl imidazole:
[0036] First add 8.35g of 36% formaldehyde aqueous solution and 18.1g of 32% glyoxal aqueous solution into a 250mL three-neck flask, stir and heat to reflux at 50°C, then add 6.05g of 28% ammonia water and benzylamine respectively The methanol solution (amount of 10.7g benzylamine dissolved in 50mL methanol) was added dropwise to the three-necked flask, after the addition, the reflux reaction was continued for 4h, the methanol was distilled off, poured into ice water, extracted with ethyl acetate, and then refluxed at 40°C Concentrate by rotary evaporation, and then vacuum-dry at 60°C for 24 hours to obtain a light yellow benzylimidazole solid with a yield of about 75%;
[0037] (2) Synthesis of silyl benzyl imidazolium chloride salt:
[0038] Dissolve 10.5g of γ-chloropropylmethyldiethoxysilane in 20mL of toluene and add it into a 100mL thre...
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Abstract
The invention relates to ionic liquid with a structure shown in formula I shown in the specification. The ionic liquid disclosed by the invention has the beneficial effects that 1) the ionic liquid is used for firstly synthesizing silicyl benzylimidazole hexafluorophosphate, and has high viscosity and good thermal stability compared with a conventional ionic liquid micro-extraction material; 2) a novel ionic liquid micro-extraction material is developed, and the defect that a conventional ionic liquid extraction material is single in structural component is overcome; moreover, the experiment is simple in operation, high in recovery rate, and easy in realization of the industrial production; 3) the ionic liquid disclosed by the invention has a relatively high adsorption capacity on polycyclic aromatic hydrocarbons, and can be used for effectively eliminating the influences of matrix interference.
Description
technical field [0001] The present invention relates to compounds useful as ionic liquids, in particular to compounds used as ionic liquids for liquid phase microextraction. Background technique [0002] Ionic liquids (ILs) are ionic compounds composed of asymmetric organic cations and organic or inorganic anions. The properties of ionic liquids can be flexibly adjusted by changing the composition of anions and cations. With its special physical and chemical properties, it has become a multi- A hotspot of research in this field (PooleC.F., J. Chromatogr.A2004, 1037(1-2):49-82.). Compared with ordinary organic solvents, it has the advantages of low volatility, larger liquid range, better chemical stability and good solubility. Since the establishment of ionic liquid-based liquid phase microextraction (LPME) technology (LiuJ., JiangG., ChiY., CaiY., ZhouQ., HuJ., Anal.Chem.2003,75(21):5870-5876.) , and its application in chromatographic sample pretreatment has developed rapi...
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IPC IPC(8): C07F7/18B01D11/04
Inventor 孙晓杰谭杰李兆新邢丽红郭萌萌谭志军翟毓秀
Owner YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI