Method for preparing parabenzoquinone dioxime
A technology of p-benzoquinone dioxime and benzoquinone monoxime, which is applied in oxime preparation, organic chemistry, etc., can solve problems such as instability, containing more impurities, and affecting the quality of p-benzoquinone monoxime, so as to improve quality stability , superior process performance, and high reaction yield
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[0008] In the present invention, in the presence of a certain concentration of sulfuric acid, sodium nitrite is used to nitrosate phenol dissolved in NaOH solution to produce p-benzoquinone monoxime, and then the prepared p-benzoquinone monoxime is added to hydroxamin to produce p-benzoquinone Dioxime, wherein in the preparation of p-benzoquinone monoxime, the back drop method is adopted: that is, 28%-32% NaOH solution is dissolved in phenol and then mixed with 93%-97% sodium nitrite solution at -3°C-5°C Mix, and then introduce into 28%-32% sulfuric acid solution through the catheter at -3°C-5°C, and add soda ash to the solution of NaOH dissolved in phenol.
[0009] The present invention is produced by following steps technique: 1) join sodium phenate liquid: 5%-20% NaOH solution and phenol liquid nitrite sodium liquid are mixed, make sodium phenate liquid, and add soda ash wherein, the weight of soda ash added It is 1 / 10 of the weight of NaOH, and it is prepared; 2) To prepar...
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