Preparation method for 2-bromophenylhydrazine
A technology of bromophenylhydrazine and bromoaniline, applied in the field of preparation of 2-bromophenylhydrazine, can solve the problems of long reaction time and high production cost
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[0008] The specific implementation of the present invention will be described below:
[0009] Add 150ml of water to an 800ml beaker, stir, add 57.5ml of 10N hydrochloric acid and 34.6g of 2-bromoaniline, warm to 80℃ to completely dissolve the 2-bromoaniline, cool to below 0℃, and slowly add sodium nitrite solution (It is made up of 15 grams of sodium nitrite and 30 grams of water). After reacting for 20 minutes, filter and retain the filtrate.
[0010] Add 200ml of water to a 1000ml beaker, add 64g of sodium metabisulfite and 65g of sodium hydroxide under stirring, stir until all dissolved and then cool to 15℃, slowly add the above filtrate, the pH of the solution is 7 and the temperature of the solution is 18 After 30 minutes of reaction, the temperature was raised to 80°C, 143.7ml of 10N hydrochloric acid was added, and the temperature was raised to 97-100°C. After reacting at this temperature for 30 minutes, 6 grams of activated carbon was added. After decolorization, it was fi...
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