Preparation method of diphenylamine or ring-substituted derivative thereof

Abstract

The invention relates to a preparation method of diphenylamine or a ring-substituted derivative thereof. The method comprises the following steps: utilizing an alkali metal alkoxide as an alkaline reagent, and performing reaction on halogenobenzene or the ring-substituted derivative thereof and N-acylated aniline or the ring-substituted derivative thereof in the presence of a catalyst to prepare the diphenylamine or the ring-substituted derivative thereof and simultaneously produce a second product, namely carboxylic acid ester. The molar ratio of the halogenobenzene or the ring-substituted derivative thereof, the N-acylated aniline or the ring-substituted derivative thereof and the alkali metal alkoxide is generally selected at 1.0:(1.0-1.1):(1.1-1.3). The method is utilized for producing the diphenylamine or the ring-substituted derivative thereof, and the method has the advantages of simple production process, short reaction period, high utilization rate of equipment, low energy consumption and a small quantity of three wastes.

Description

technical field [0001] The invention relates to an improved method for preparing diphenylamine or derivatives substituted on its ring, which belongs to the technical field of chemical industry. Background technique [0002] Diphenylamine or derivatives substituted on its ring are widely used organic intermediates for the preparation of dyes, pesticides, rubber additives and the like. For example, 4-alkoxy-2-methyldiphenylamine is a class of extremely valuable diphenylamine derivatives used as raw materials for the preparation of fluoran dyes for pressure-sensitive or heat-sensitive recording paper. [0003] The preparation method of diphenylamine or derivatives substituted on its ring comprises: deamination of aniline or derivatives substituted on its ring; reaction of aniline or derivatives substituted on its ring with bromobenzene or its derivatives to remove bromine Hydrogen; condensation and intramolecular Methods such as hydrogen transfer reaction; aniline or its ring...

AI Technical Summary

Problems solved by technology

In the inventor's patent, although the utilization rate of atoms in the deacylation reaction is improved, the waste is reduced, the reaction time is shortened, the energy consumption is reduced, and the production cost is reduced, but the problem of the condensation reaction stage still exists

From the point of view of the entire production process (including condensation reaction process and deacylation reaction process) from conventional raw materials to target products, the ideal goal of a clean production process of "energy saving, consumption reduction, pollution reduction, and efficiency enhancement" has not yet been achieved.

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