A kind of method for preparing n-alkyl-4-nitrophthalimide

A technology of alkylphthalimide and nitrophthalimide, which is applied in the field of low-temperature nitration reaction to prepare N-alkyl-4-nitrophthalimide series products, It can solve the problems of low yield of N-alkyl-4-nitrophthalimide, no N-alkylphthalimide has been seen, and difficulty in transferring heat of nitration reaction in time, so as to avoid the phenomenon of overheating , Reduce the amount of nitric acid and the discharge of three wastes, the effect of reducing the amount
CN109305933BActive Publication Date: 2020-07-28ZHEJIANG WANFENG CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG WANFENG CHEM
Publication Date
2020-07-28

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Abstract

The invention belongs to the technical field of organic synthetic processes, and relates to a method for preparing N-alkyl-4-nitrophthalimide by adopting N-alkyl phthalimide as a raw material, nitricacid as a nitrating agent, and performing low-temperature nitration reaction by virtue of a continuous flow to prepare the series product of N-alkyl-4-nitrophthalimide. The method is short in reactiontime and short in production period, solves the problems produced by the accumulation of raw materials in an intermittent reaction kettle, is more stable in the reaction process, and can significantly improve the reaction efficiency. The mass transfer performance and heat conduction performance in a micro-channel reactor of different structures can be improved, the constant reaction temperature can be kept, the temperature runaway phenomenon can be avoided, the generation of byproducts can be reduced, and the safety of the reaction process can be improved. By adopting the high mass transfer effect in the micro-channel reactor, a liquid-liquid reaction solution is sufficiently mixed, in the reaction process, the consumption of concentrated sulfuric acid and nitric acid can be greatly reduced, and the generation of waste acid can be reduced.
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Description

technical field

[0001] The invention belongs to the technical field of organic synthesis technology, and relates to a method for preparing N-alkyl-4-nitro-phthalimide by using N-alkyl phthalimide as raw material and nitric acid as nitrating agent through continuous flow for low-temperature nitration reaction. Method for phthalimide series products. Background technique

[0002] Phthalimide is an important fine chemical intermediate, widely used in medicine, pesticide, dyestuff and other fields. With the advancement of science and technology, its new uses have been continuously developed in recent years, and many downstream products have high added value. Disperse dyes have become one of the most active dye categories in the world's dye market. Due to factors such as the industrialization of ultrafine polyester fibers, the growth of polyester fibers for tourism, and the increase in the use of polyester fabrics for sportswear and vehicles, the high Among the high-performance...

Claims

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