Green synthesis method of 1, 4-diamino-anthraquinone

Abstract

The invention discloses a green synthesis method of 1, 4-diamino-anthraquinone, and relates to the technical field of chemical synthesis. The method comprises the following steps of hydrogenation: carrying out catalytic hydrogenation reaction taking 1, 4-diamino-anthraquinone as a raw material, taking a Pd Ru bimetallic catalyst loaded by active carbon as a hydrogenation catalyst, in the presenceof an organic solvent to obtain hydrogenation liquid; performing ammoniation: reacting the obtained hydrogenation liquid with ammonia gas, discharging the ammonia gas after the reaction is finished, and evaporating the solvent to obtain the 1, 4-diamino-anthraquinone leuco body; oxidation: heating and reacting the 1, 4-diamino-anthraquinone leuco body to obtain 1, 4- diamino-anthraquinone. By adopting the nano hydrogenation reduction process, the synthesis process has the advantages of no generation of high COD, high salt wastewater or waste acid and environmental protection. The hydrogenationcatalyst can be used repeatedly, the reaction solvent can be recovered, and the production cost is low. The purity of the product is more than or equal to 97 percent, the yield is more than or equalto 95 percent, and the economic value is high.

Description

technical field [0001] The invention relates to chemical synthesis, in particular to a green synthesis method of 1,4-diaminoanthraquinone. Background technique [0002] 1,4-Diaminoanthraquinone is an important intermediate in the synthesis of dyes and is widely used in the production of disperse dyes, vat dyes and acid dyes. The key step is the synthesis of 1,4-diaminoanthraquinone leucosome. At present, the widely synthesized method in industry is to use 1,4-dihydroxyanthraquinone as a raw material, and react with ammonia water in one step in the presence of sodium hydrosulfite or hydrazine hydrate to generate 1,4-diaminoanthraquinone leucosome, and then pass through Oleum oxidation produces 1,4-diaminoanthraquinone. However, the disadvantage of this method is that a large amount of high-COD, high-salt wastewater and high-COD waste acid are produced, and the treatment of waste acid and high-salt wastewater is difficult. [0003] Chinese patent CN108395381A discloses a pr...

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Problems solved by technology

However, the disadvantage of this method is that a large amount of high COD, high salt wastewater and high COD waste acid are produced, and the treatment of waste acid and high salt wastewater is difficult.

[0003] Chinese patent CN108395381A discloses a preparation method of 1,4-diaminoanthraquinone leuco. The method uses 1,4-dihydroxyanthraquinone as a raw material, mixes it with hydrazine hydrate and an organic solvent, and reacts at a reaction pressure of 0.2 to 0.5 MPa. , at a reaction temperature of 50-100°C, react with ammonia to prepare 1,4-diaminoanthraquinone leuco. The disadvantage of this method is that hydrazine hydrate is highly toxic and expensive

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