Method and catalyst for recovering diphenols by catalytic hydrocracking of phenol-containing tar

Abstract

The invention relates to a method for recovering diphenol by catalytic hydrocracking of phenol-containing tar, a catalyst and a catalyst used in the method. The method uses cesium salt-modified titanium dioxide loaded with palladium and silver as a catalyst, and uses phenol-containing tar as a reaction raw material in an ethanol solvent to directly synthesize ortho / hydroquinone through catalytic hydrogenation. The method is simple to operate and environmentally friendly. On the one hand, the residual hydroquinone product in the phenol-containing tar is recovered, and at the same time, the tar produced by phenol dimerization and deep oxidation is rehydrocracked into a high value-added diphenol product. , which not only reduces the treatment cost of solid waste, but also significantly increases the yield of diphenol products.

Description

technical field

[0001] The invention belongs to the technical field of catalytic hydrogenation, and in particular relates to a method for recovering diphenol by catalytic hydrocracking of phenol-containing tar and a catalyst used in the method. Background technique

[0002] Catechol and hydroquinone are important fine chemical products with a wide range of uses. The method of producing o- and hydroquinone by hydroxylation of phenol with hydrogen peroxide as an oxidant is a production process widely used in the world. At present, the international development of hydrogen peroxide phenol hydroxylation synthetic quinone process routes include Rhone-Poulenc method, keto-acid method, Brichima method, Enichem method, etc. Currently, the commonly used methods in industry are Rhone-Poulenc method and Enichem method. Regardless of the process, a certain amount of phenol-containing tar is produced as a by-product during the phenol hydroxylation reaction.

[0003] craft Rh...

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