Method for preparing p-benzoquinone by electrocatalytic oxidation of phenylamine

An electrocatalytic oxidation and aniline preparation technology, which is applied in the electrolytic process, electrolytic components, electrolytic organic production, etc., can solve the problems of low primary yield of aniline, insufficient primary utilization of pyrolusite powder, etc., and achieve the effect of improving the oxidation effect

Inactive Publication Date: 2013-03-13
CHONGQING YOUCUI SCI & TECH
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Problems solved by technology

In other words, the prior art still has the disadvantages that the primary utilization rate

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  • Method for preparing p-benzoquinone by electrocatalytic oxidation of phenylamine
  • Method for preparing p-benzoquinone by electrocatalytic oxidation of phenylamine
  • Method for preparing p-benzoquinone by electrocatalytic oxidation of phenylamine

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Embodiment Construction

[0012] A method for preparing p-benzoquinone by electrocatalytic oxidation of aniline, the method may further comprise the steps:

[0013] (1) Put the pyrolusite powder and dilute sulfuric acid into the oxidation tank to prepare a solution; then add aniline dropwise to the solution so that the manganese dioxide contained in the pyrolusite powder can oxidize aniline; among them, the pyrolusite powder The manganese dioxide content is 45-60%;

[0014] (2) After the oxidation reaction is completed, the solution is distilled, crystallized, dehydrated and dried to obtain the product p-benzoquinone;

[0015] In the process of dropping aniline in step (1), the present invention performs electrocatalytic oxidation, and the anode current density of the electrocatalytic oxidation is 80-150A / m 2 , the temperature is 0-10°C, and the time is 8-13 hours; the particle size of pyrolusite powder is not greater than 0.15mm (that is, passing through a 100-mesh Taylor standard sieve); the mass pe...

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Abstract

The invention discloses a method for preparing p-benzoquinone by electrocatalytic oxidation of phenylamine. The method comprises the following steps of: preparing soft manganese mineral powder and dilute sulphuric acid into a solution; dipping phenylamine into the solution; oxidizing phenylamine by manganese dioxide contained in soft manganese mineral powder; and after oxidization reaction is finished, distilling the solution, crystallizing, dewatering and drying to obtain the product p-benzoquinone. By the method, electrocatalysis, reinforcement and oxidization are added during oxidization of phenylamine; the oxidization effect of the original manganese dioxide in the soft manganese mineral powder is improved, and the Mn<2+> which does not basically act is converted into Mn<3+> and Mn<4+> during oxidization so as to reinforce the oxidization process, so that the primary utilization rate of the soft manganese mineral powder is improved, and the primary yield rate of p-benzoquinone is naturally improved.

Description

technical field [0001] The invention relates to a method for preparing p-benzoquinone with aniline as raw material and pyrolusite as oxidant. Background technique [0002] p-Benzoquinone (C 6 h 4 o 2 ) is an important chemical product, mainly used as oxidizing agent, polymerization inhibitor, dye intermediate and rubber anti-aging agent, and can also be used as an initiator of gas accumulation reaction and a raw material for the production of hydroquinone. One of the methods for industrially producing p-benzoquinone is to convert aniline (C 6 h 5 NH 2 ) placed in an acidic medium, with the main component being manganese dioxide (MnO 2 ) pyrolusite powder for oxidation, and then obtained by distillation, crystallization, dehydration and drying. In order to ensure that there is enough manganese dioxide to oxidize, to improve the productive rate of p-benzoquinone, it is usually necessary to add pyrolusite powder in excess, so the pyrolusite residue after the reaction sti...

Claims

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Application Information

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IPC IPC(8): C25B3/02C25B3/23
Inventor 杜军刘作华陶长元费珊珊
Owner CHONGQING YOUCUI SCI & TECH
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