Electrochemical preparation method of benzanthrone

Abstract

The invention discloses an electrochemical preparation method of benzanthrone, which comprises the following steps: (1) sequentially adding electrolyte and anthraquinone into a diaphragm-free electrolytic tank, inserting a cathode and an anode, and introducing nitrogen; (2) stirring and heating to a reaction temperature, electrifying, dropwise adding glycerol into the electrolytic tank, and reacting at a constant temperature and a constant flow; and (3) after the reaction is completed, diluting the electrolyte until the mass fraction of the acid is 60%, separating out a product, filtering, washing and drying to obtain the benzanthrone. The method has the advantages that 1, the benzanthrone is prepared by adopting an electrochemical method, the process is simple, and the reaction condition is mild; 2, no organic solvent is added in the reaction process, no heavy metal salt is generated, and the method is an environment-friendly organic synthesis reaction; 3, a reaction product is easy to separate, the content of benzanthrone is high, and an additional treatment process is not needed; and 4, main pollutants in the electrolyte are some sulfonates of anthraquinone or benzophenone and are easy to remove, and the purified electrolyte can be recycled.

Description

Technical field: [0001] The invention relates to the technical field of electrochemical organic synthesis, in particular to an electrochemical preparation method of benzranthrone. Background technique: [0002] Benzoanthrone, also known as Benzoanthrone, is an important anthraquinone dye intermediate, which can be used to produce a variety of vat dyes, such as vat dark blue BO, vat brilliant green FFB, vat gray M, vat olive green B, vat Olive green T, reduced black BBN, etc.; its molecular formula is C 17 H 10 O, its molecular structure is as follows: [0003] [0004] The traditional synthesis process of benrazanthrone is as follows: under the condition of concentrated sulfuric acid, anthraquinone and glycerin are synthesized with iron powder or zinc powder as reducing agent and copper sulfate as catalyst. During the reaction, a large amount of heavy metal salts such as ferrous sulfate, ferric sulfate and copper sulfate will be produced. The concentrated sulfuric acid...

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Problems solved by technology

[0006] In order to overcome the shortcomings of the existing benzothrone synthesis process complex and serious environmental pollution, the purpose of the present invention is to provide a simple process, mild conditions, environmentally friendly electrochemical preparation method of benzoxantrone

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