Manufacturing method of nitrile and corresponding amine thereof

Abstract

The invention relates to a manufacturing method of nitrile. Compared with the prior art, the manufacturing method has the characteristics of significantly reduced using amount of an ammonia source, low environmental pressure, low energy consumption, low production cost, high purity and yield of a nitrile product and the like, and nitrile with a more complex structure can be obtained. The invention also relates to a method for manufacturing corresponding amine from nitrile.

Description

technical field [0001] The invention relates to a process for the production of nitriles and a process for producing corresponding amines from the nitriles. Background technique [0002] Aromatic monohydric nitrile has a wide range of uses, and the demand for it in domestic and foreign markets has increased year by year in recent years. For example, benzonitrile is an important intermediate for the synthesis of chemicals such as pesticides and aromatic amines, an intermediate for advanced coatings such as benzomelamine, and a solvent for resin polymers, nitrile rubber and coatings. O-methylbenzonitrile can be used to synthesize the agricultural fungicides kresoxim-methyl, methamine, fluoramide and so on. m-Toluonitrile is an important pesticide, pharmaceutical and dye intermediate, widely used in the production of fine chemicals. p-Toluonitrile is one of the main raw materials of optical brighteners, and is also widely used in the synthesis of drugs, dyes and other fine ch...

AI Technical Summary

Problems solved by technology

Although this ammoxidation method has the advantages of cheap and easy-to-get raw materials, short reaction route, and easy handling of products, there are four serious problems below: (1) In order to improve the yield, NH 3 The consumption is too large; (2) a large amount of waste ammonia water is produced in the reaction process, which causes great pressure on the environment and aftertreatment; (3) the reaction substrate range is narrow, and the selectivity is low when preparing alkyl mononitriles; (4) the reaction The temperature is high (above 410°C), and the requirements for catalyst preparation are very high

[0005] But, the inventor of the present invention finds by research, and prior art is when producing nitrile by carboxylic acid ammoniation method, in order to make ammoniation reaction fully carry out, require Ammonia gas is continuously fed into the reaction system as a raw material during the entire ammoniation process of carboxylic acid or within a long reaction time, so the amount of ammonia gas is huge, resulting in the actual amount of ammonia gas far exceeding the amount required for the ammoniation reaction , which may be tens of millions of times the actual reaction requirement, resulting in extremely low ammonia utilization

In addition, due to the extremely low utilization rate of ammonia, the ammonification reaction produces a large amount of waste ammonia water but cannot be recycled. After discharge, it will cause huge pressure on the environment, which is inconsistent with the current green production concept.

Moreover, since the ammoniation reaction of this technology adopts an overall higher reaction temperature (such as exceeding 300°C) and an overall longer reaction time, the energy consumption is higher, resulting in higher production costs, and there are also reactions during the reaction process. Severe material loss (for example, the reaction material is entrained out of the reaction system due to continuous feeding of ammonia gas flow) and many side reactions, which make it difficult to effectively improve the quality and yield of nitrile products, etc.

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