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Detection method of content of N-methylimidazole in imidazolium ionic liquid

A detection method, ionic liquid technology, applied in the direction of measuring device, color/spectral characteristic measurement, and material analysis by observing the influence on chemical indicators, etc. Pollution, affecting life and other issues, to achieve the effect of rapid qualitative and quantitative detection

Inactive Publication Date: 2017-10-27
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These detection methods are relatively mature, convenient and fast, but there are few reports on the detection of residual organic raw materials in imidazole ionic liquids, especially the determination of N-methylimidazole residues in imidazole ionic liquids
Conventional organic detection methods such as gas chromatography are very convenient and fast, but due to the special properties of ionic liquids, they will cause serious pollution to the chromatographic column, thereby affecting its life.

Method used

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  • Detection method of content of N-methylimidazole in imidazolium ionic liquid
  • Detection method of content of N-methylimidazole in imidazolium ionic liquid
  • Detection method of content of N-methylimidazole in imidazolium ionic liquid

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Effect test

Embodiment 1

[0028] 1-Ethyl-3-methylimidazolium tetrafluoroborate ([EMIm]BF 4 For the detection of N-methylimidazole content in ), select [EMIm]BF 4 (Imported high-purity sample) is the standard sample of this type of ionic liquid, and the standard curve is prepared according to the steps (attached figure 2 ). Accurately weigh 0.099 g of [EMIm]BF 4 The sample to be tested (1) was prepared into a 10 mL solution with absolute ethanol. Add 1.0 mL of Cu(II) ion color indicator, and conduct UV-visible spectrum analysis after sufficient reaction to obtain the maximum absorption peak λ max at 932 nm, from figure 2 It can be seen that the N-methylimidazole content corresponding to the position of the maximum absorption peak at 932 nm is 5.9% by mass. Accurately weigh 0.1g of [EMIm]BF 4 The sample to be tested (2) was prepared into a 10 mL solution with absolute ethanol. Add 1.0 mL of Cu(II) ion color indicator, and conduct UV-visible spectrum analysis after sufficient reaction to obtain t...

Embodiment 2

[0030] 1-Butyl-3-methylimidazolium tetrafluoroborate ([BMIm]BF 4 ) detection of N-methylimidazole. Select [BMIm]BF 4 (Imported high-purity sample) is the standard sample of this type of ionic liquid, and the standard curve is prepared according to the steps (attached figure 1 ). Weigh 0.105 g[BMIm]BF 4 The sample to be tested (1) was prepared into a 10 mL solution with absolute ethanol. Add 1.0 mL of Cu(II) ion color indicator, and conduct UV-visible spectrum analysis after sufficient reaction to obtain the maximum absorption peak λ max The position is at 902 nm. According to Figure (1), it can be seen that the N-methylimidazole content corresponding to the maximum absorption peak at 902 nm is 3.5% by mass. Weigh 0.099 g[BMIm]BF 4 The sample to be tested (2) was prepared into a 10 mL solution with absolute ethanol. Add 1.0 mL of Cu(II) ion color indicator, and conduct UV-visible spectrum analysis after sufficient reaction to obtain the maximum absorption peak λ max The...

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Abstract

The invention discloses a detection method of the content of N-methylimidazole in imidazolium ionic liquid. The detection method comprises the following steps: adopting a UV ultraviolet-visible spectroscopy analysis method to prepare the imidazolium ionic liquid and anhydrous ethanol into a 0.1mol / L mixed solution, and by taking an ethanol solution (0.05mol / L) of Cu(II) ions as a complexing color indicator, carrying out UV ultraviolet-visible spectroscopy analysis; according to an obtained maximum absorption peak position lambda max of ultraviolet-visible spectrum, carrying out quantitative analysis on the N-methylimidazole in the imidazolium ionic liquid, wherein for an external standard method standard sample of the imidazolium ionic liquid, an imported high-purity ionic liquid sample is selected. The detection method adopts the simple, convenient and rapid spectroscopy analysis method to carry out qualitative and quantitative analysis, is relatively little influenced by the properties, such as the variety, the viscosity and the conductivity, of the ionic liquid, has the detection range capable of reaching 0-60mol%, is very practical in rapid analysis and detection on the imidazolium ionic liquid, and has very great actual significance of producing the ionic liquid in a large scale.

Description

technical field [0001] The invention relates to a method for detecting the content of N-methylimidazole in imidazole ionic liquids by using an ultraviolet-visible spectroscopic analysis method. Background technique [0002] Room temperature ionic liquids, as a special class of organic salt compounds, are known for their "low melting point, wide liquid range, close to zero vapor pressure, unique solubility, high ionic conductivity and thermal stability, and wide The physical and chemical properties such as the "electrochemical window" are very suitable for the characteristics of green media, which has attracted widespread attention from academia and business circles. Ionic liquids are used as green solvents for organic and catalytic reactions. They are used in the preparation of new materials, It has applications in extraction and separation processes as well as in electrochemical fields such as new electrolytes. However, the residual impurity content in ionic liquids, such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/78
CPCG01N21/3103G01N21/78
Inventor 邓友全何昱德马祥元卢六斤刘士民倪文鹏
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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