A kind of method for preparing hydroquinone

Abstract

The invention provides a method for preparing hydroquinone, which uses an electrochemical method to oxidize benzene at the anode to generate p-benzoquinone benzene solution, and the p-benzoquinone benzene solution reacts with hydroquinone aqueous solution to obtain an oil phase layer, An aqueous phase layer and an intermediate layer, the intermediate layer is a quinhydrone suspension formed by generated quinhydrone crystals, the quinhydrone suspension is heated and re-dissociated to obtain a p-benzoquinone benzene solution, and the dissociated The obtained p-benzoquinone benzene solution is reduced at the cathode to obtain hydroquinone product. This method can obtain p-benzoquinone reaction solution with increased concentration, and then enter the cathode chamber for reduction to obtain hydroquinone, which solves the problem of low concentration of p-benzoquinone reaction solution during the anodic oxidation of benzene or phenol into p-benzoquinone , a large amount of raw material benzene needs to be separated, distilled and recycled mechanically, which causes the problem of high energy consumption.

Description

technical field [0001] The invention relates to the technical field of hydroquinone preparation, in particular to an electrochemical method capable of efficiently preparing hydroquinone. Background technique [0002] Hydroquinone is an important fine chemical raw material and intermediate, which is widely used in the fields of medicine, pesticides, dyes, rubber, fertilizers, water treatment and liquid crystal polymers. Its uses mainly include the following aspects: (1) as a polymerization inhibitor for polymer monomers, such as styrene, butadiene, isoprene, ethyl acetate, acrylonitrile, etc.; (2) for the manufacture of photographic film (3) Used as petroleum anticoagulant, synthetic ammonia catalyst, etc.; (4) Used as an intermediate for the synthesis of carbofuran, propoxur, berberine and adrenal (5) Used in the manufacture of urease inhibitors, added before ordinary urea granulation, can produce new urea varieties with high utilization rate and long fertilizer effect peri...

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Problems solved by technology

[0005] In order to solve the problems in the prior art, the present invention provides a method for preparing hydroquinone, which can obtain p-benzoquinone reaction solution with increased concentration, and then enter the cathode chamber for reduction to obtain hydroquinone, which solves the problem of During the anodic oxidation of benzene or phenol into p-benzoquinone, since the concentration of the p-benzoquinone reaction solution is not high (less than 3%), a large amount of raw material benzene needs to be separated, distilled and recycled, which causes the problem of high energy consumption

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