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Synthesis method of N-phenyl-maleimide

A technology of maleimide and synthetic method, applied in the direction of organic chemistry, can solve the problems of complicated steps and low product purity, and achieve the effect of simple process and high product purity

Inactive Publication Date: 2012-08-15
如皋市油脂化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation of N-phenylmaleimide mainly adopts acylation, but there are disadvantages of complex steps and low product purity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Dissolve 100Kg maleic anhydride in 700Kg xylene, stir until almost dissolved, add 100Kg aniline dropwise, control the dropping rate to ensure that the reaction temperature does not exceed 35°C, after the dropwise addition, continue stirring for 1 hour to obtain the acylated product.

[0016] Transfer the above reaction system to another kettle, add 1.5Kg of hydroquinone and 20Kg of molecular sieves that have been soaked in phosphoric acid, heat to reflux, and dehydrate until no water appears. The temperature is lowered to 60~70°C, the molecular sieve is filtered off while it is hot, the temperature is lowered to about 0°C, and the temperature is kept at 0°C for 2~3 hours.

[0017] Put the crude product and xylene into the reactor, heat up and stir to dissolve, add clay, sodium bicarbonate, the weight ratio of crude product, xylene, clay, and sodium bicarbonate is 1:5:0.05:0.05, and put in clay and sodium bicarbonate Then, after stirring for 1 hour, suction filtration, and th...

example 2

[0019] Dissolve 100Kg maleic anhydride in 700Kg xylene, stir until almost dissolved, add 100Kg aniline dropwise, control the dropping rate to ensure that the reaction temperature does not exceed 35°C, after the dropwise addition, continue stirring for 1 hour to obtain the acylated product.

[0020] Transfer the above reaction system to another kettle, add 1.5Kg of hydroquinone and 20Kg of molecular sieves that have been soaked in phosphoric acid, heat to reflux, and dehydrate until no water appears. The temperature is lowered to 60~70°C, the molecular sieve is filtered off while it is hot, the temperature is lowered to about 0°C, and the temperature is kept at 0°C for 2~3 hours.

[0021] Put the crude product and cyclohexane into the reactor, heat up and stir to dissolve, add clay, disodium hydrogen phosphate, crude product, xylene, clay, sodium bicarbonate in a weight ratio of 1:7:0.05:0.05, put in clay, hydrogen carbonate After adding sodium, stirring for 1 hour, suction filtrati...

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PUM

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Abstract

The invention discloses a synthesis method of N-phenyl-maleimide, which comprises three steps of: 1. carrying out acylation on maleic anhydride and phenylamine in solvent to obtain N-phenyl-maleamic acid; 2. dehydrating the N-phenyl-maleamic acid in the solvent with hydroquinone and molecular sieve attached with phosphoric acid to obtain a crude product; and 3. adding activated clay and apply acid agent into the solvent of the crude product to obtain the product by refining. After the technology is adopted, the synthesis method is environment-friendly, simple in technology and low in cost.

Description

Technical field [0001] The invention relates to a synthetic method of N-phenylmaleimide, in particular to a synthetic method of obtaining N-phenylmaleimide by acylation. Background technique [0002] N-phenylmaleimide is a heat-resistant organic monomer that has been well developed in recent years. It can be embedded in polymers to enhance the internal rotation resistance between polymers. It is mainly used in ABS, PVC, etc. [0003] At present, the preparation of N-phenylmaleimide mainly adopts acylation, but there are disadvantages of complicated steps and low product purity. Summary of the invention [0004] The invention provides a method for synthesizing N-phenylmaleimide, in particular to a method for synthesizing N-phenylmaleimide with simple dehydration catalyst and purification method, simple equipment, simple process and high product purity . [0005] In order to solve the above technical problems, the method for synthesizing N-phenylmaleimide of the present invention main...

Claims

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Application Information

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IPC IPC(8): C07D207/448
Inventor 石建国刘宏
Owner 如皋市油脂化工有限责任公司
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