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Aziridine preparation method

A technology of aziridine and dehydration reaction, applied in the direction of organic chemistry, can solve the problems of low synthesis efficiency, large environmental pollution of by-products, difficult purification, etc., and achieve the effect of less by-products, simple synthesis raw materials, and mild synthesis conditions

Pending Publication Date: 2019-06-21
NINGXIA JOIE MATERIAL CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing aziridine preparation method has the problems of large environmental pollution by by-products, low synthesis efficiency and difficult purification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Raw materials

[0024] raw material name Specification% factory Quantity kg ethanolamine ≥99％ Shanghai Boying Chemical 100 solid sodium hydroxide ≥96％ Tianjin Zhonglian Huasheng Chemical Co., Ltd. 20

[0025] 2. Synthesis process

[0026] (1) Esterification and hydrolysis

[0027] Put the barreled ethanolamine into the metering tank by the self-priming pump for use; put 100kg of ethanol amine into the dehydration reaction kettle to start the agitator, put montmorillonite into the dehydration reaction kettle, and then add acidic diatomite to the dehydration reaction kettle Palladium catalyst, control the temperature in the dehydration reactor at 280°C, close the vent valve of the dehydration reactor, then turn on the vacuum pump, control the pressure in the dehydration reactor at 0.095Mpa, carry out vacuum concentration and dehydration for 3 hours, and then control the temperature in the dehydration reactor At 450°C, control the ...

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Abstract

Aiming at defects in the prior art, the invention provides an aziridine preparation method which is high in synthesis efficiency and is environment-friendly. Ethanolamine is used as a raw material, and is subjected to vacuum high-temperature dehydration to synthesize aziridine under the catalysis of montmorillonite and an acidic diatomite palladium-supported catalyst, synthesis conditions are mild, and large-scale industrial production is facilitated; besides, synthetic raw materials are simple, the raw materials are then purified by caustic soda flakes in a distillation and purification process, by-products are few, and the method is environment-friendly; and initial distillation is carried out under normal pressure, and then fine distillation is carried out under low pressure, so that the purity of the obtained aziridine reaches 99% or above.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a preparation method of aziridine. Background technique [0002] Aziridine, also known as cycloethylamine and ethanolimine, is a colorless liquid with ammonia odor, freezing point -74°C, b.p.55-56°C, n25D 1.4123, relative density 0.832 (24°C), f.p.12°C, and Miscible in water, soluble in ethanol, the aqueous solution is alkaline, easy to polymerize when encountering acid or absorbing carbon dioxide, commercial cycloethylamine contains a small amount of sodium hydroxide as a stabilizer. The list of carcinogens released by the International Agency for Research on Cancer of the World Health Organization is a preliminary collation reference, and aziridine is included in the list of carcinogens of type 2B. Aziridine vapor forms an explosive mixture with air, which can cause combustion and explosion in case of open flame and high heat. It can react with oxidants. It can ...

Claims

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Application Information

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IPC IPC(8): C07D203/08
Inventor 沈健吴天平谢韦邱欣欣祁刚
Owner NINGXIA JOIE MATERIAL CO LTD