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Method for extracting pyridine compound by using ionized liquid extracting agent

A technology for extracting pyridine and pyridines, applied in the field of chemical technology, can solve problems such as harmful extraction process, loss of ionized liquid, entry of ionized liquid, etc., and achieve the effects of improving extraction efficiency, improving solubility and saving costs

Inactive Publication Date: 2012-07-25
NANJING REDSUN BIOCHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest difficulty in using ionized liquids to extract organic matter from aqueous solutions is the loss of ionized liquids, and more or less part of the ionized liquids will enter the water phase during the extraction process.
The high price of ionic liquids and the unknown hazards to the environment make the extraction process unable to achieve large-scale industrial application at present

Method used

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  • Method for extracting pyridine compound by using ionized liquid extracting agent
  • Method for extracting pyridine compound by using ionized liquid extracting agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put 10 mL of pyridine-containing aqueous solution (10 mg / mL) and 1000 mg of N-butylpyridine hexafluorophosphate in a 150 mL reaction vessel, at pH=4, at a temperature of 80 °C, on a magnetic stirrer After stirring for 1 hour, the organic phase and the water phase were separated, and the pyridine content in the organic phase was determined by high performance liquid chromatography to be 95 mg, and the extraction rate was 95%.

Embodiment 2

[0026] 10 mL of an aqueous solution containing 3-methylpyridine compound (10 mg / mL) and 200 mg of N-butylpyridine hexafluorophosphate were placed in a 150 mL reaction vessel. After stirring on a magnetic stirrer for 20 hours, the organic phase and the water phase were separated, and the content of 3-picoline in the organic phase was determined by high performance liquid chromatography to be 90 mg, and the extraction rate was 90%.

Embodiment 3

[0028] The aqueous solution containing 2-chloropyridine compound (10mg / mL) 10mL, N-octylpyridine hexafluorophosphate 500mg, placed in a 150mL reaction vessel, at pH=6, the temperature is 80 ℃, under the condition of Stir on a magnetic stirrer for 3 hours, and then separate the organic phase and the water phase. The content of 2-chloropyridine in the organic phase is determined by high performance liquid chromatography to be 96 mg, and the extraction rate is 96%.

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Abstract

The invention belongs to the field of chemical processes and discloses an ionized liquid extracting agent and a method for extracting a pyridine compound by using the ionized liquid extracting agent. The extracting agent is a hydrophobic pyridine ionic liquid shown as the formula (I), wherein R1 is alkyl, and R2 is H or low-level alkyl. The method for extracting the pyridine compound by using the ionized liquid extracting agent comprises the step of: extracting the pyridine compound from the water solution of the pyridine compounds by using the extracting agent. The pyridine compound is pyridine or a pyridine substituent, and the substituent group can be halogen, amino, carboxyl or C1-4 alkyl. As the hydrophobic ionic liquid is used as the extracting agent, the pyridine compound in water is efficiently extracted, the extracting agent is safe and stable without environment pollution, and can be recycled, and the method is an economic and practical environment-friendly means.

Description

technical field [0001] The invention belongs to the field of chemical technology, and relates to an ionized liquid extractant and a method for extracting pyridine compounds by using the extractant. Background technique [0002] Pyridine compounds are important chemical raw materials and organic synthesis intermediates. They can be used as solvents, denaturants, dye auxiliaries, catalysts and synthetic starting materials. They are widely used in pesticides, medicines, synthetic rubbers and dyes. A large number of industrial applications produce a large amount of wastewater containing pyridine compounds. The extraction and separation of pyridine compounds in research and development wastewater is of great environmental significance and is also an effective sample pretreatment method. [0003] Liquid-liquid extraction is a mature and effective separation method, which is widely used. The solvent used in liquid-liquid extraction is generally dichloromethane, petroleum ether, be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D213/127C07D213/16C07D213/61C07D213/803C07D213/79C07D213/80C07D213/73
Inventor 江涛薛谊郭畅秦必政武强陶兴标蒋剑华
Owner NANJING REDSUN BIOCHEM CO LTD
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