Catalyst for hydroxylation reaction of phenol and preparation method thereof

Abstract

The invention provides a catalyst for hydroxylation reaction of phenol and a preparation method thereof, belonging to the technical field of chemical engineering and relating to phenol hydroxylation co-production catechol and hydroquinone catalyzer as well as a preparation method thereof. The preparation method of the catalyst is characterized by comprising the following steps: adopting a hydrothermal synthesis method, and packaging phthalocyanine containing water-soluble groups in an MCM-41 channel in the form of molecule to prepare an immobilized homogeneous catalyst. The effects and the benefits of the invention are as follows: the preparation process of the catalyst is simple and has good repeatability; the phthalocyanine packaged in the MCM-41 channel exists in the form of molecule; metal ions or ligands without being subject to complexation do not exit in the MCM-41 channel; the phthalocyanine on the outer surface of the MCM-41 channel is easy to be eliminated; and the prepared catalyst has high capacity and good ordered channel. The catalyst has the advantages that the homogeneous catalyst has mild reaction conditions, high reactivity and good selectivity, and heterogeneouscatalyst is easy to be separated from a product and can be used repeatedly.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering, and relates to a catalyst and a preparation method thereof, in particular to a catalyst for hydroxylation of phenol and co-production of catechol and hydroquinone and a preparation method thereof. Background technique [0002] Catechol and hydroquinone are important chemical raw materials. The traditional production methods of catechol include o-chlorophenol, o-dichlorobenzene hydrolysis and 1-phenol-2-sulfonate sodium alkali fusion or alkaline hydrolysis. Catechol is taken; hydroquinone is produced by oxidation of aniline or oxidative acidolysis of p-dicumene. The problems in these processes are many production steps, many by-products, serious corrosion and environmental pollution, and low production capacity. [0003] The process of using hydrogen peroxide and phenol as raw materials to carry out hydroxylation reaction to co-produce catechol and hydroquinone plays an important role...

AI Technical Summary

Problems solved by technology

[0002] Catechol and hydroquinone are important chemical raw materials. The traditional production methods of catechol include o-chlorophenol, o-dichlorobenzene hydrolysis and 1-phenol-2-sulfonate sodium alkali fusion or alkaline hydrolysis. Catechol is obtained; hydroquinone is produced by oxidation of aniline or oxidative acidolysis of p-dicumene. The problems in these processes are many production steps, many by-products, serious corrosion and environmental pollution, and low production capacity

Relatively speaking, this preparation method is relatively simple, but since hexadecylchlorocopper phthalocyanine has no water-soluble groups, phthalocyanine molecules are prone to aggregation, and the phthalocyanine on the surface of the molecular sieve is not easy to remove

[0009] In addition, the above three methods all use microporous molecular sieves. Due to the small aperture, the molecules of phthalocyanine are relatively large, and the molecular space structure of phthalocyanine may be distorted in the pores of microporous molecular sieves; Diffusion speed is slow in smaller pores; the phthalocyanine used does not contain water-soluble groups, and phthalocyanine molecules are easy to aggregate in molecular sieves, and at the same time, it also increases the difficulty of catalyst post-treatment

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