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Prepn of bromochloro-fulminuric acid bactericide

A technology of bromochloroisocyanuric acid and disinfectant and sterilant, which is applied in the field of preparation of bromochloroisocyanuric acid disinfectant and sterilant, can solve the problems of small product particle size, low solubility, difficult filtration and the like, and achieves high effective chlorine content, The effect of easy control of conditions and simple preparation process

Inactive Publication Date: 2002-02-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low solubility of the first bromide, the rapid formation of fine particle precipitation, resulting in incomplete subsequent chlorination, too small particle size, and difficulty in filtration, has not been industrialized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: 240 mL of tap water was added to a 500 mL four-necked bottle, and 25.2 g of NaOH was added under stirring. Cool to 10°C. Slowly add 25.8g of isocyanuric acid under stirring, and continue stirring for 5-10 minutes until the material is basically dissolved. Under the conditions of rapid stirring and controlled reaction temperature 10°C, feed Cl 2 , until the pH = 4.8, dropwise added 16g of Br 2 , and then into the Cl 2 until pH = 2.5. The obtained white solid was suction filtered, and the solid was naturally dried. Weighs 64.8 grams. Total available chlorine: 57.9%; available bromine: 47.7%.

Embodiment 2

[0012] Embodiment 2: add 240mL tap water in 500mL four-necked bottle, add 23gNa 2 CO 3 . Cool to 10°C. Slowly add 25.8g of isocyanuric acid under stirring, and continue stirring for 5-10 minutes until the material is basically dissolved. Under the conditions of rapid stirring and controlled reaction temperature 10°C, feed Cl 2 , until the pH = 4.8, dropwise added 16g of Br 2 , and then into the Cl 2 , until pH=2.5. The obtained white solid was suction filtered, and the solid was naturally dried. Weighs 63.4 grams. Total available chlorine: 55.7%; available bromine: 46.8%.

Embodiment 3

[0013] Example 3: 240 mL of tap water was added to a 500 mL four-necked bottle, and 17.5 g of powdered CaO was added under stirring. Cool to 10°C. Slowly add 25.8g of isocyanuric acid under stirring, and continue stirring for 5-10 minutes until the material becomes uniform. Under the conditions of rapid stirring and controlled reaction temperature 10°C, feed Cl 2 , until the pH = 4.8, dropwise added 16g of Br 2 , and then into the Cl 2 , until pH=2.5. The obtained white solid was suction filtered, and the solid was naturally dried. Weighs about 64.9 grams. Total available chlorine: 56.4%; available bromine: 47.3%.

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PUM

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Abstract

The present invention uses isocyanuric acid as main raw material, and adopts the following main steps: adding alkali to make solvation, chlorization, bromation, secondary chlorization, filtering and drying to prepare bromochloro-isocyanuric acid. It is characterized by that dissolving the isocyanuric acid in aqueous solution of alkali or emulsion, introducing chlorine gas into solution or emulsion respectively at 5-15 deg.C, then drop-adding liquid bromine, finally introducing chlorine gas to make chlorization reaction, and controlling pH value to 2.5-4 to obtain effective chlorine whose content is 54-58% and effective bromine whose content is 46-49%. Its preparation method is simple, condition is easy to control, and its product possesses quick sterilizing action.

Description

technical field [0001] The invention relates to a preparation method of bromochloroisocyanuric acid disinfectant. It belongs to the preparation technology of halogenated isocyanuric acid. Background technique [0002] Halogenated hydantoins, halogenated isocyanuric acids and halogenated glycolurils are some typical high-efficiency biocides for water treatment. Especially bromochlorodimethylhydantoin, which has high activity (it can kill bacteria, algae, etc. in water very effectively at a concentration lower than 1ppm), broad-spectrum biocidal property, long-lasting effect, and wide application pH range , Insensitivity to nitrogenous compounds in water and so on. It is widely used in the killing and algae killing of cooling water system, the disinfection and purification of swimming pool water, and the sterilization and disease prevention of aquaculture industry. Bromochlorodimethylhydantoin was commercialized in the United States in the 1970s, and it...

Claims

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Application Information

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IPC IPC(8): C07D251/36
Inventor 张文勤赵海涛赵温涛庄俊鹏
Owner TIANJIN UNIV
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