Electrochemical synthesis method for preparing halogenated hydantoin

Abstract

The invention relates to an improved synthesis method for hydantoin bromo and for preparing dibromohydantoin or bromo-3-chloro-5,5-dimethylhydantoin. The method comprises the following steps of: taking various hydantoins as raw materials, dissolving the hydantoins and the corresponding amount of bromide in 0.2g / mL saturation chlorate solution, electrolyzing the bromide solution and obtaining the corresponding hypobromite, generating hypobromous acid under the condition of addition of acid, further performing bromo reaction to the hydantoin, adjusting the bromide equivalent according to demand and synthesizing the corresponding dibromohydantoin or bromo-3-chloro-5,5-dimethylhydantoin. Reaction liquid can be repeated and used, and the reaction yield can reach more than 95%. The invention has the advantages of easy obtainment of raw materials by low cost, low production cost, simple post treatment, high yield, good purity and repetitive recycle of the mother liquid. By utilizing the electrolysis process, the process is simple, and the equipment has low requirement, safe operation and no toxicity or stimulation.

Description

Technical field [0001] The invention belongs to the synthesis technology of dihalogen hydantoin, and specifically relates to a preparation method for preparing various dichlorohydantoin, dibromohydantoin and bromochlorohydantoin type high-efficiency disinfection, sterilization and algaecide. Background technique [0002] With the development of my country's economy, the acceleration of my country's modernization and urbanization, the large-scale and intensive development of agriculture and animal husbandry, the rapid and large-scale circulation of livestock and poultry and their products, the spread of various bacteria and viruses has accelerated. The use of disinfectants has greatly increased, and they play an important role in sterilization and sanitation. [0003] Dihalogenated hydantoin is a highly effective disinfectant and algaecide. Its most common varieties are dichlorodimethylhydantoin, dibromodimethylhydantoin and bromochlorodimethylhydantoin. These compounds are in addit...

AI Technical Summary

Problems solved by technology

[0007] Each of the above synthetic processes has its own characteristics, but there are some shortcomings, such as high cost of raw materials, or too strong alkalinity of the solution in the early stage of the reaction, obvious decomposition of hydantoin; or difficult and highly toxic production control of liquid bromine or chlorine, and serious corrosion of equipment; Or a large amount of waste water is produced in the production process. In summary, it is meaningful to develop a preparation process with high synthetic yield, good product purity, simple production control, low production cost, and environmentally friendly and pollution-free process.

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