Method of quickly and continuously preparing benzenediol from low-concentration water solution of phenol

Abstract

The invention discloses a method of quickly and continuously preparing benzenediol from a low-concentration water solution of phenol and belongs to the field of organic chemistry. The benzenediol is prepared by catalyzing a phenol water solution, of which mass percentage is 3-6%, with a copper-based quaternary nano hydrotalcite-like catalyst, wherein the hydrotalcite-like compound is CuM2<+>FeAl, the M2<+> being any one of Mg<2+>, Zn<2+> and Ni<2+>. The catalyst, in a hydroxylation reaction process, has excellent conversion rate and high selectivity.

Description

technical field [0001] The invention relates to a catalytic reaction technology for rapidly preparing hydroquinone with a low-concentration aqueous solution of phenol, in particular to a design and preparation method of a copper-based quaternary hydrotalcite. Background technique [0002] The products of phenol hydroxylation reaction are catechol and hydroquinone, which are important fine chemical products. It can be used to synthesize carbofuran (carbofuran), propoxur, berberine, adrenaline, vanillin, piperonal, etc.; it can also be used in dyes, photosensitive materials, electroplating materials, special inks, additives, etc. There are many traditional synthesis methods of hydroquinone, such as o-dichlorobenzene alkali fusion method, o-chlorophenol hydrolysis method, bisphenol A method, etc., but the problems of traditional methods are serious equipment corrosion, low yield, and serious pollution of three wastes . The phenol hydroxylation method is a method in which hydr...

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Problems solved by technology

There are many traditional synthesis methods of hydroquinone, such as o-dichlorobenzene alkali fusion method, o-chlorophenol hydrolysis method, bisphenol A method, etc., but the problems of traditional methods are serious equipment corrosion, low yield, and serious pollution of three wastes

[0004] Patent CN105618130A discloses a metal oxide-supported molecular sieve catalyst for phenol hydroxylation reaction. Although this type of catalyst has good selectivity and reduces the corrosion of the catalyst to equipment, the synthesis process is complicated and the cost is high

[0005] Patent 200810090830.2 Fe treated with reducing agent 2 o 3 As a catalyst for the hydroxylation of phenol to diquinone, the preparation process of this type of catalyst is simple and the cost is low, but there are many influencing factors and the catalytic performance varies greatly

[0006] The patent CN103537320B invention provides a resin catalyst for phenol hydroxylation, although the compatibility between the resin and phenol is improved, but the catalytic performance is weak and the thermal stability is poor

[0007] Patent CN103570503B provides a new process for the synthesis of hydroquinone, which has a short process flow, cheap raw materials, and less waste, but cannot be produced continuously, and by-products such as tar have not been effectively controlled.

[0008] restricts its application in industry

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