Synthesis process of dimido dipheny compound

Abstract

The invention discloses a synthesis process of a dimido dipheny compound. The synthesis process disclosed by the invention comprises the following steps: by taking benzene(I) as a raw material, carrying out continuous nitration on a micro reactor platform to obtain a mixed nitrobenzene compound (II); then obtaining a mixed diaminobenzene compound (III) by carrying out catalytic hydrogenation reduction under a mild condition with temperature of 50~70 DEG C and hydrogen gas pressure not higher than 1.0MPa; and purifying to obtain o-phenylenediamine, p-phenylenediamine and m-phenylenediamine. The synthesis process disclosed by the invention has the benefits that: the use level of nitric acid is low, so that the waste acid is easy to concentrate and apply mechanically; the heat release is less, the product dinitrobenzene compound (II) is quickly transferred, the reaction phenomenon is stable without intense heat release and even punch of a common autoclave nitration reaction, so that the safety of nitration reaction is improved; the rate in nitrification reaction is fast, and the energy consumption is reduced; the reaction phenomenon is stable, so that the safety of catalytic hydrogenation reduction reaction is improved; the synthesis process is a new technique which is high in safety, easy to industrialize and less in environment protection.

Description

technical field [0001] The invention relates to a synthesis process of organic compounds, in particular to a synthesis process of diaminobenzene compounds. Background technique [0002] Diaminobenzene compound (III), including three compounds of o-, m-, and p-phenylenediamine, is widely used in the manufacture of various dyes. In Japan, m-phenylenediamine consumed by azo dye intermediate dyes accounts for 90% of the total consumption. %. At the same time, it is also widely used in the curing agent of epoxy resin, coagulant of cement, hair dye, mordant, color developer, and petroleum additives, and can be used as a raw material for the manufacture of pharmaceuticals and for the photometric determination of nitrite and reagents for active chlorine in water. [0003] The method of synthesizing diaminobenzene compound (III): (1) benzene (I) obtains dinitrobenzene compound (II) through continuous nitration, and then through reduction (divided into iron powder one-step reduction...

AI Technical Summary

Problems solved by technology

However, in traditional tank reactors, especially in high-risk chemical reactions such as nitration (including continuous nitration) and catalytic hydrogenation reduction, there are many instantaneously reacted materials, large heat generation, many side reactions, and industrial safety accidents are prone to occur

[0005] The reaction on the microreactor platform has the advantages of sufficient mixing of raw and auxiliary materials, less instantaneous reaction materials, rapid transfer of reaction products, and high industrial safety, which overcomes the low industrial safety, large heat release, and easy production of products in the traditional tank reaction conditions. Coking and other disadvantages provide a safe production method for some important organic compounds

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