Method for regenerating chloranil by oxidation of hydrogen peroxide

Abstract

The invention discloses a method for regenerating chloranil by oxidation of hydrogen peroxide and belongs to the technical field of preparation of compounds. The method mainly comprises the followingsteps of: 1) adopting chloranil as a raw material and adopting hydrogen peroxide as an oxidant, stirring in a methanol solvent to carry out reaction, wherein chloranil is almost not dissolved in methanol, so that with conduction of reaction, products are gradually precipitated out to obtain yellow solid; 2) separating reaction liquid obtained in the step 1) by simple filtering operation to obtaina product (chloranil) so as to realize regeneration of chloranil. The method disclosed by the invention has the beneficial effects that the cost is lower, the aftertreatment is simple and convenient,the yield of chloranil is higher, the solvent can be reused for multiple times, the operation is simple, the produced sewage is less, so that the method is environmentally friendly and is suitable forindustrial large-scale production.

Description

technical field [0001] The invention relates to a method for regenerating chloranil by hydrogen peroxide oxidation, which belongs to the technical field of compound preparation. Background technique [0002] 2,3,5,6-Tetrachloro-2,5-cyclohexadiene-1,4-dione (tetrachlorobenzoquinone) is a golden yellow leafy crystal with a melting point of 290°C and is easily soluble in ether , Slightly soluble in alcohol, hardly soluble in chloroform, carbon tetrachloride and carbon disulfide, almost insoluble in cold alcohol, insoluble in water. Chlorobenzoquinone is widely used in the field of dyes and pesticide intermediates, and is often used as dye intermediates and agricultural seed dressing agents. In the pharmaceutical industry, it can be used in the production of anti-cancer drug iminoquinone and anti-aldosterone drug spironolactone (Chen Guangyu. Dyestuff Industry, 1982(06):15-19.). As a better oxidative dehydrogenation reagent, chloranil also has very important uses in the fields...

AI Technical Summary

Problems solved by technology

The main problem that this method exists has: (1) used hydroquinone as starting raw material, did not realize the direct oxidation to tetrachlorohydroquinone, program temperature rise reaction, process is more complicated; (2) mainly utilized hydrogen peroxide The principle of oxidizing hydrochloric acid to generate chlorine gas, chlorine gas is generated during the reaction process, the operation is more complicated, and the equipment requirements are higher; (3) hydrochloric acid and acetic acid are used as solvents, and more waste water is generated in the post-treatment process, and the solvents are difficult to recycle.

[0006] At present, after industrial production, most of tetrachlorohydroquinone is directly discarded, but this will not only cause waste of resources, increase production costs, but also cause very serious harm to the environment

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