A system and method for continuous production of phthalimide

By designing jet and atomizing reactors in a continuous production system, the problem of heat accumulation and transfer difficulties in traditional phthalimide production has been solved, achieving efficient and environmentally friendly phthalimide production.

CN122124740APending Publication Date: 2026-06-02QINGDAO UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
QINGDAO UNIV OF SCI & TECH
Filing Date
2026-03-23
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Traditional phthalimide production processes suffer from problems such as heat accumulation, incomplete reaction, excessive wastewater, difficulty in relocation, and high equipment requirements, resulting in environmental pollution and poor economic benefits.

Method used

A continuous production system is adopted, in which urea and phthalic anhydride are melted, mixed in a jet reactor and sprayed to form atomized droplets. Combined with gas circulation and gas heating/cooling in the atomization reactor, the amidation reaction is realized, avoiding heat accumulation and facilitating product transfer.

Benefits of technology

This technology enables continuous production of phthalimide, avoids side reactions, reduces wastewater generation, improves reaction efficiency and product transfer convenience, and reduces energy consumption.

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Abstract

This invention belongs to the field of organic synthesis technology and provides a system and method for continuous production of phthalimide. The system provided by this invention can melt urea and phthalic anhydride separately, and then mix and spray the resulting molten urea and molten phthalic anhydride in a jet reactor. The resulting atomized droplets undergo an amidation reaction in the atomization reactor to obtain the final product. The formation of atomized droplets from molten phthalic anhydride and molten urea through jetting improves the contact between reactants and the reaction efficiency. Simultaneously, the small size of the atomized droplets facilitates heat dissipation, reduces heat accumulation, and avoids side reactions. The placement of a first and second air inlet in the atomization reactor allows the gas generated during the amidation reaction and unreacted raw materials to be directly carried out of the system by the gases introduced through the first and second air inlets, avoiding the mixing and accumulation of snowflake-like products with unreacted materials, facilitating transfer, eliminating the need for water during product transfer, and increasing energy efficiency.
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