Synthetic process for amino aromatic hydrocarbon compound

Abstract

The invention discloses a synthetic process for an amino aromatic hydrocarbon compound. The process comprises the following steps: pre-preparing reaction solutions -1 and -2 by using an aromatic hydrocarbon compound (I), concentrated sulphuric acid and concentrated nitric acid, respectively pumping the solutions in a micro reactor, heating to react, cooling the reaction liquid, and pos-treating to obtain a nitryl aromatic hydrocarbon compound (II); mixing the nitryl aromatic hydrocarbon compound (II), a catalyst and a solvent as a reaction solution -3; respectively pumping the reaction solution -3 and hydrogen into the micro reactor, heating to react, cooling the reaction liquid and post-treating to obtain the amino aromatic hydrocarbon compound (III). The process disclosed by the invention is less in use level of nitric acid, convenient to concentrate and apply waste acid; in the nitrification reaction process, the heat release is little, and the nitration product nitryl aromatic hydrocarbon compound (II) is quickly transferred. The reaction phenomenon is stable without intense heat release and even material punching of a common kettle nitration reaction, so that the safety of nitration reaction is improved; the process is easy to realize industrialization, simple to operate and high in industrial safety degree and meets the environmental requirements.

Description

technical field [0001] The invention relates to a preparation method of organic compounds, in particular to a synthesis process of aminoaromatic compounds. Background technique [0002] Aminoaromatic compound (III) is a class of organic synthesis intermediates, and has a wide range of applications in the fields of dyes, pesticides, medicines, and fragrances. One of the main intermediates for the synthesis of disperse blue dyes, p-aminobenzenesulfonic acid is a synthetic reactive dye p-(β-sulfate ethyl sulfone) aniline (commonly known as "reduced product"), o-aminotoluene can be used to synthesize dinitromethanol, etc. Wait. Studying the synthesis methods of these compounds and developing new processes with high efficiency, low energy consumption and environmental protection are of great significance for national chemical production and global environmental protection. [0003] The technology currently used in the industrialized large-scale production of aminoaromatic compo...

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Problems solved by technology

[0006] This process has the advantages of reliable process conditions and stable product quality, but objectively existing problems limit or even stop the existence and development of this type of old process: (1) in the nitration reaction process, the amount of nitric acid is often large, and the reaction ends. It takes a lot of energy and expense to recycle the nitric acid before concentrating the waste acid, which will produce highly toxic nitrogen oxides, pollute the air, and endanger the health of organisms; (2) The iron powder used in the iron powder reduction process is greatly excessive. Hot water washes the aminoaromatic compound (III) adhering to the iron sludge, and the amount of iron sludge and waste water is very large, which is very serious to environmental pollution. At present, this kind of high energy consumption, large amount of solid waste and waste water, and very serious environmental pollution The reduction method has been clearly listed as an elimination or immediate elimination process by the national industrial policy, and all domestic manufacturers who use the iron powder reduction method are ordered to stop production and develop a new low-energy, high-environmental nitro reduction process that can replace the iron powder reduction method

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