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Ionic liquid formed by dimethylamide and thiocyanate and its preparation method and application

A technology of dimethylamide and dimethylformamide, applied in the field of ionic liquids, can solve the problems of high price and high price, and achieve the effects of low cost, easy preparation, and suitable for large-scale industrial production and application.

Inactive Publication Date: 2008-08-06
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a large number of ionic liquids have shown broad application prospects, but their high price is an important bottleneck restricting their industrial application.
The price of general ionic liquids reported in the literature is more than twice that of commonly used organic solvents, especially when Ag salt is used as raw material for metathesis reaction, the price is even more expensive

Method used

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  • Ionic liquid formed by dimethylamide and thiocyanate and its preparation method and application
  • Ionic liquid formed by dimethylamide and thiocyanate and its preparation method and application
  • Ionic liquid formed by dimethylamide and thiocyanate and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Extraction

[0023] Weigh 10g of potassium thiocyanate and dissolve it in 100ml of N,N-dimethylformamide, stir well until it is completely dissolved, let it stand at room temperature for 8h, the solution turns pink to obtain an ionic liquid. Add it to extract and separate the benzene-n-heptane system. When the volume ratio of benzene and n-heptane in the raw material liquid is 1:1, and the volume ratio of ionic liquid and raw material is 1:1, the distribution coefficient of n-heptane after extraction is 10.17 , The distribution coefficient of benzene is 1.22, and the selectivity coefficient reaches 8.32.

Embodiment 2

[0024] Example 2 Extraction

[0025] Weigh 10g of ammonium thiocyanate and dissolve it in 100ml of N,N-dimethylformamide, stir well until it is completely dissolved, let it stand at room temperature for 4h, the solution turns pink to obtain an ionic liquid. It is added to extract and separate the benzene-cyclohexane system. When the volume ratio of benzene and cyclohexane in the raw material liquid is 1: 1, and the volume ratio of ionic liquid and raw material is 1: 1, the distribution coefficient of cyclohexane after extraction is 2.97, the distribution coefficient of benzene is 0.94, and the selectivity coefficient is 3.16.

Embodiment 3

[0026] Embodiment 3 extractive distillation

[0027] Weigh 18g of potassium thiocyanate and dissolve it in 100ml of N,N-dimethylformamide, stir well until it is completely dissolved, leave it at room temperature for 6h, and the solution turns pink to obtain the target ionic liquid. The ionic liquid is added to the benzene-cyclohexane system as the separation agent required for extractive distillation, when the volume ratio of benzene and cyclohexane in the raw material liquid is 1:1, and the volume ratio of the ionic liquid to the raw material is 0.3:1 , extraction and rectification separation of benzene and cyclohexane, the relative volatility between the components increased to 2.17.

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Abstract

The invention provides an ionic liquid prepared from dimethylformamide and rhodanate, a corresponding preparation method and an application. The preparation method comprises adding 10 to 20g of kalium rhodanatum or ammonium sulfocyanate colorless crystal into 100mI of N, N-dimethylformamide or of N, N-dimethylacetamide colorless transparent liquid, mixing and reacting for 2-8h in air, under natural light and at 18-25 DEG C until the solution is pink or orange, depressurizing, distilling and purifying the reaction product when the vacuum degree is 0.08 to 0.1 MPa to prepare the ionic liquid. The ionic liquid can be used in extraction separation benzene-cyclohexane / skellysolve C system and extraction distillation separation benzene-cyclohexane / skellysolve C system. The invention has wide diversity of raw material, low cost, easy preparation and simple purification, which is fit for large-scale industrial production and application. The invention realizes better selection separation effect, to provide an excellent quality separating agent for extraction and extraction distillation or the like.

Description

(1) Technical field [0001] What the present invention relates to is an ionic liquid, and the present invention also relates to a kind of preparation method of ionic liquid, and the present invention also relates to the application of this ionic liquid. Specifically, it relates to an ionic liquid produced by the reaction of an organic solvent and an inorganic salt, and a preparation method and application of the ionic liquid. (2) Background technology [0002] Ionic liquids are salts composed of organic cations and inorganic or organic anions that are liquid at or near room temperature. Its low volatility, low melting point, wide liquid range, wide chemical window, good electrical and thermal conductivity, high thermal stability and selective solubility make it widely used in extraction and other separation operations; fuel cells, solar energy Preparation of batteries, lithium batteries, etc.; medium for chemical reactions, especially catalytic reactions; electrolyte additiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C233/89C07C233/03C07C7/08
Inventor 董红星杨晓光赵文文袁文王晓宇姚春艳
Owner HARBIN ENG UNIV
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