Electrochemical synthesis method for preparing halogenated hydantoin

A technology of dihalogenated hydantoin and a synthesis method, which is applied in the electrolysis process, electrolysis components, electrolysis organic production, etc., can solve the problems of difficult control of liquid bromine or chlorine gas production, obvious decomposition of hydantoin, strong alkalinity of solution, etc. The feeding operation is convenient and simple, the raw materials are cheap and easy to obtain, and the production cost is low.

Inactive Publication Date: 2010-07-14
HUBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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 chl

Method used

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  • Electrochemical synthesis method for preparing halogenated hydantoin
  • Electrochemical synthesis method for preparing halogenated hydantoin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 30mL water, 1.28g (0.01mol) dimethyl hydantoin and 1.90g (0.02mol) magnesium chloride into a 100mL flask, insert an electrode with both cathode and anode Pt, connect the circuit, and conduct electrolysis, keep the current at 0.05A (use Electrode area is 1cm 2 ), while stirring, add dilute hydrochloric acid dropwise during the electrolysis process to make the pH at 2, electrolysis for 21.5 hours (approximately equal to the theoretical time value), filter, wash with water, and dry to obtain the product dichlorodimethylhydantoin 0.49g, yield 25.0%

Embodiment 2

[0031] Add 30mL of 0.2g / mL sodium chloride solution, 1.28g (0.01mol) dimethylhydantoin into a 100mL flask, insert the electrode with Au for anode and C for cathode, connect the circuit, energize and electrolyze, keep the current at 0.5A (the electrode area is 1cm 2 ), while stirring, add dilute hydrochloric acid dropwise during the electrolysis process to make the pH between 4-5, electrolyze for 10.5 hours (approximately 5 times the theoretical time value), filter, wash, and dry to obtain 1.42g of dichlorodimethylhydantoin. The yield was 72.3%

Embodiment 3

[0033] Add 30mL water, 2.80g (0.01mol) dimethylphenylhydantoin and 1.90g (0.02mol) magnesium chloride into a 100mL flask, insert an electrode with Pt both at the cathode and anode, connect the circuit, energize the electrolysis, and keep the current at 0.1 A (The electrode area is 1cm 2 ), while stirring, add dilute hydrochloric acid dropwise during the electrolysis process to make the pH 6-7, electrolyze for 10.5 hours (approximately equal to the theoretical time value), filter, wash, and dry to obtain 2.61g of product dichlorobis-p-methylphenylhydantoin , The yield is 75.0%

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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...

Claims

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Application Information

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IPC IPC(8): C25B3/06
Inventor 李焰潘怡沛董建强袁振昌陈祖兴
Owner HUBEI UNIV
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