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    Home > Coatings News > Paints and Coatings Market > Coating knowledge: process flow of preparation of tetrabromobisphenol A

    Coating knowledge: process flow of preparation of tetrabromobisphenol A

    • Last Update: 2020-03-25
    • Source: Internet
    • Author: User
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    Firstly, the prepared ethanol solvent is pumped into the reactor, and bisphenol A is put into the reactor to stir and dissolve in the ethanol solvent to form the ethanol solution of bisphenol A, and then catalyst is added into the ethanol solution of bisphenol A under the temperature of 10-40 ℃, the bromine drops are added into the reactor containing the ethanol solution of bisphenol A by vacuum suction, and the bisphenol A is partially brominated and hydrogen bromide is generated, Chlorine is introduced into the above solution to oxidize the generated hydrogen bromide to bromine, and continue to participate in the bromination reaction of bisphenol A when the color of the product turns bright red, the color phase remains unchanged for 15 minutes, and then it is put into the ripening kettle to raise the temperature of the reaction liquid to 75-82 ℃ for strengthening the bromination reaction When the reflux begins, the reaction liquid is cooled to 10-30 ℃ after the high temperature bromination reaction time of 30 minutes, (the lower the temperature is, the better) put the filter cake into the vacuum suction tank, use the vacuum to dry the mother liquor, and then wash the filter cake with ethanol solution and deionized water successively; take out the filter cake and put it into the centrifuge for further washing, wash it with water and dry it, until the acidity of the product becomes neutral, and put the washed filter cake into the storage after vacuum drying at 80 ℃ Namely, product tetrabromobisphenol A A preparation method of tetrabromobisphenol A is characterized in that: (1) bisphenol A is dissolved in an ethanol solvent to form an ethanol solution of bisphenol A, the weight ratio of bisphenol A to ethanol is 1:1-9, and then sulfuric acid is added into the ethanol solution of bisphenol A, the amount of the catalyst is 0.5-20% of the weight of the ethanol solution of bisphenol A; (2) bromine is added into the ethanol solution of bisphenol A, the amount of the catalyst is The weight ratio of bisphenol A to bromine is 1:2-2.5, the temperature of bromination is kept at 10-40 ℃, the time of bromination is 0.5-3 hours, at this time, part of bisphenol A is brominated and hydrogen bromide is produced; (3) hydrogen peroxide is added into the above solution to oxidize the generated hydrogen bromide to bromine, and continue to participate in the bromination reaction of bisphenol A until the bromination reaction is completed or bromine is exhausted, and the above-mentioned peroxide The weight ratio of hydrogen and bisphenol A is 1:2.0-2.5, the reaction temperature of oxidation bromination is kept at 10-40 ℃, the dropping time of hydrogen peroxide is 0.5-3 hours, until the above reaction is completed; (4) after the above low temperature bromination reaction is completed, the reaction liquid is heated to 70-80 ℃ for strengthening bromination, and the high temperature bromination reaction time is 20-120 Minutes; (5) cool the reaction liquid to 10-30 ℃, vacuum filter, and wash the filter cake with ethanol solution and deionized water successively; (6) dry the washed filter cake at 60-90 ℃
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