Method for preparing parabenzoquinone dioxime
A technology of p-benzoquinone dioxime and benzoquinone monoxime, applied in oxime preparation, organic chemistry, etc., can solve the problems affecting the quality of p-benzoquinone monoxime, containing more impurities, affecting the quality of p-benzoquinone dioxime, etc. Achieve superior process performance, high reaction yield, and improve quality stability
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[0007] 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 is characterized in that, when preparing p-benzoquinone monoxime, add soda ash to the sodium phenoxide solution made by dissolving phenol in NaOH solution, the amount of soda ash is 1 / 10 of the weight of NaOH.
[0008] Preferred embodiment of the present invention: produce according to the following steps: carry out according to the following steps: 1) sodium phenate solution: 5%-20% NaOH solution is mixed with phenol solution and sodium nitrite solution to obtain sodium phenate solution , and add soda ash to it, the weight of soda ash added is 1 / 10 of the weight of NaOH; 2) To prepare p-benzoquinone monoxime, introduce the sodium phenoxide solution into the 28%-32% acid solution ...
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