Efficient constant-temperature process for preparing tribromophenol by sodium bromide method
A technology of tribromophenol and sodium bromide, which is applied in the field of high-efficiency constant temperature process for preparing tribromophenol by sodium bromide method, can solve the problems of high synthesis cost, harsh equipment and process requirements, and great harm of hydrobromic acid, and achieves Fewer products, lower requirements, and higher utilization
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Embodiment 1
[0022] A high-efficiency constant temperature process for preparing tribromophenol by a sodium bromide method, specifically comprising the following steps:
[0023] a) Pre-reaction: Add raw materials and solvents to a constant temperature reaction kettle equipped with a stirring mechanism to obtain a solid-liquid mixture A. The raw materials include 1-3 parts of phenol, 2-10 parts of sodium bromide, 10-20 parts of water and Concentration is 7-25 parts of hydrochloric acid of 30%, described solvent is dimethyl sulfoxide, and the number of parts by weight of dimethyl sulfoxide is 10-20 parts (parts are parts by weight, the same below);
[0024] b) Adding reaction reagents dropwise: at room temperature, turn on the mixer, and add 10% hydrogen peroxide solution dropwise to the thermostatic reaction kettle in step a), the hydrogen peroxide is added in parts by weight of 10-30 parts , the dropping rate is 0.5-1 part / min;
[0025] c) Reaction stirring: the stirring mechanism in the ...
Embodiment 2
[0031] A high-efficiency constant temperature process for preparing tribromophenol by a sodium bromide method, specifically comprising the following steps:
[0032] a) Pre-reaction: Add raw materials and solvent to a constant temperature reaction kettle equipped with a stirring mechanism to obtain a solid-liquid mixture A. The raw materials include 1-2 parts of phenol, 4-6 parts of sodium bromide, 12-18 parts of water and Concentration is 10-15 parts of hydrochloric acid of 30%, described solvent is dimethyl sulfoxide, and the number of parts by weight of dimethyl sulfoxide is 10-15 parts;
[0033] b) Dropwise addition of reaction reagents: at room temperature, turn on the mixer, and dropwise add a hydrogen peroxide solution with a concentration of 10% to the thermostatic reaction kettle in step a), the number of parts by weight of hydrogen peroxide added is 12-20 parts , the dropping rate is 0.5-0.8 parts / minute;
[0034] c) Reaction stirring: the stirring mechanism in the c...
Embodiment 3
[0040] A high-efficiency constant temperature process for preparing tribromophenol by a sodium bromide method, specifically comprising the following steps:
[0041] a) Pre-reaction: Add raw materials and solvents into a constant temperature reaction kettle equipped with a stirring mechanism to obtain a solid-liquid mixture A. The raw materials include 1 part of phenol, 5 parts of sodium bromide, 15 parts of water and 30% hydrochloric acid 12 parts, the solvent is dimethyl sulfoxide, and the added parts by weight of dimethyl sulfoxide are 15 parts;
[0042] b) Adding reaction reagents dropwise: at room temperature, turn on the mixer, and dropwise add a hydrogen peroxide solution with a concentration of 10% to the thermostatic reaction kettle in step a), and add 15 parts by weight of hydrogen peroxide, drop The acceleration is 0.5 parts / minute;
[0043] c) Reaction stirring: the stirring mechanism in the constant temperature reactor continued to stir, and reacted for 1 hour to ...
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