Process for producing resorcinol by continuously hydrolyzing m-phenylenediamine

Abstract

The invention discloses a process for producing resorcinol by continuously hydrolyzing m-phenylenediamine. The devices adopted by the process include a pipe mixer, a heat exchanger and a tower reactor, wherein baffle plates are distributed in the tower reactor from top down and the external wall of the tower reactor is provided with a heating pipe coil. The process comprises the following steps: 1, continuously preparing a hydrolysis raw material by using the pipe mixer to form homogeneous aqueous solution of m-phenylenediamine sulfate; 2, preheating the aqueous solution of m-phenylenediaminesulfate to 225 to 245 DEG C by the heat exchanger, continuously filling the aqueous solution of m-phenylenediamine sulfate to the tower reactor from the top part of the tower reactor, keeping the reaction and retention time of the reaction material in the tower reactor between 120 and 240 minutes, and performing continuous hydrolysis reaction; and 3, performing post-processing step of the hydrolysis reaction solution obtained by the hydrolysis reaction to obtain the resorcinol. The process has the characteristics of high equipment efficiency, short production period, high product yield, stable product quality and simple and convenient process control.

Description

(1) Technical field [0001] The invention relates to a process for producing resorcinol by continuous hydrolysis of m-phenylenediamine. (2) Background technology [0002] Resorcinol (Resorcinol), commonly known as Resorcinol, also known as 1,3-benzenediol, is an important organic chemical raw material, widely used in pesticides, dyes, paints, medicines, plastics, rubber, electronic chemicals It is mainly used in the preparation of impregnating agents for tire cords, adhesive resins for synthetic rubber, high-performance adhesives for wood plywood, synthetic benzophenone UV absorbers, m-aminophenol, etc. [0003] At present, the routes of industrial synthesis of resorcinol mainly include the sulfonation alkali fusion method using benzene as raw material, the oxidation method using m-dicumene as raw material, and the hydrolysis method of m-phenylenediamine. Domestically, the sulfonated alkali fusion method using benzene as raw material is mainly used. Due to the process and eq...

AI Technical Summary

Problems solved by technology

There is inhomogeneity in the mixing area of ​​the mechanical stirring mixer. In order to fully mix two or more liquid materials in the shortest time, the mixing intensity must be increased. The increase in the mixing intensity will inevitably lead to excessive external input energy consumption.

In order to ensure the use of subsequent processes, intermittent batching needs to be equipped with two sets of batching devices or a set of large-volume batching devices and storage containers at the same time, which will lead to long storage time of hydrolyzed materials, increased decomposition of raw materials, and reduced reaction yield and product quality.

Images