Synthesis method of dibromohydantoin

By employing electrochemical in-situ bromination and a three-stage cooling crystallization method, the safety hazards and purity issues associated with liquid bromine were resolved, enabling efficient and stable production of dibromohydantoin and improving product yield and purity.

CN122079896APending Publication Date: 2026-05-26WEIFANGDONGYUAN LIANHAI ENVIRONMENTAL TECH CO LTD
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Patent Information

Application Number
CN202610525137.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-21
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

The traditional dibromohydantoin production process poses safety hazards due to the volatility, corrosiveness, and toxicity of liquid bromine, while the low utilization rate of bromine and the violent reaction result in unsatisfactory product purity.

Method used

An electrochemical in-situ bromination technique was adopted, using solid sodium bromide as the bromine source. Electrolysis was carried out in a microchannel reactor to generate active bromine, and a three-stage stepped cooling crystallization method was combined to control the reaction temperature and mixing process.

Benefits of technology

It improves the formation stability and product quality of dibromohydantoin, reduces safety risks, increases bromine utilization and product purity, and enhances crystal uniformity and separation efficiency.

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Abstract

The invention belongs to the technical field of dibromohydantoin production, and particularly provides a dibromohydantoin synthesis method which comprises the following steps: S1, preparing a raw material aqueous solution, namely respectively mixing dimethyl hydantoin, sodium bromide and liquid caustic soda NaOH with deionized water to form a dimethyl hydantoin aqueous solution, a sodium bromide aqueous solution and a liquid caustic soda NaOH aqueous solution; s2, premixing the raw material aqueous solution, namely mixing the aqueous solution of dimethyl hydantoin, sodium bromide and caustic soda liquid NaOH prepared in S1 to obtain a premix; s3, electrochemical in-situ bromination reaction: introducing the premix into a micro-channel reactor provided with an electrolysis electrode, and applying current to the premix to obtain a dibromohydantoin initial solution; and S4, crystallizing, separating and drying the product, carrying out cooling crystallization through a three-stage stepped cooling method to obtain a dibromohydantoin crystal, carrying out centrifugal separation to obtain a dibromohydantoin wet product, and then drying to obtain a dibromohydantoin finished product. The method can improve the generation stability and the product quality of the dibromohydantoin.
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