Preparation of N-phenyl maleimide

A technology of maleimide and phenyl, which is applied in the field of preparation of N-phenylmaleimide, can solve the problems of long preparation cycle, high energy consumption, high cost, etc., achieve stable product quality, reduce three wastes, The effect of reaction time reduction
CN101462997AInactive Publication Date: 2009-06-24SHANGHAI HUAYI GRP CO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI HUAYI GRP CO
Publication Date
2009-06-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for preparing N-benzyl maleimide which adopts maleic anhydride and aniline as raw materials to take imidation reaction in benzene reaction solvent in the presence of an inhibitor and a mixed dehydration catalyst to obtain the target product of the invention. The purity of the N-benzyl maleimide prepared by the one-step method of the invention reaches more than 98.5 percent, and the yield is 90-92 percent. Compared with the prior art, the method has the advantages of less reaction time, short period and safe and convenient operation. A post-processing method of directly drying out the solvent and recycling the solvent is adopted, so that the yield is improved, three wastes are reduced, the operational environment is improved and the quality of products is stable. The method is applied to the large-scale industrial production.
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Description

technical field

[0001] The invention relates to a preparation method of N-phenylmaleimide. Background technique

[0002] N-phenylmaleimide is an important organic compound, which can be widely used in antifouling coatings and heat-resistant plastics. As a heat-resistant modifier, N-phenylmaleimide can also partially replace engineering plastics, and can be added to ABS resin to produce super heat-resistant ABS resin, making the heat-resistant temperature of ABS resin reach 125-130°C. Its structural formula is as follows:

[0003]

[0004] In the prior art, the method for preparing N-phenylmaleimide is mainly carried out with maleic anhydride and aniline, and its reaction process is:

[0005]

[0006] Shandong Chemical Industry, 2000, volume 29, third issue, pages 13-14 "Research on the preparation of N-phenylmaleimide", reported a two-step method for preparing N-phenylmaleimide, at 55-65 ° C Maleic anhydride is reacted with aniline under certain conditions, and afte...

Claims

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