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[Chemical Knowledge]：Production and manufacturing methods and processes of fatty amines

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The manufacturing method
of fatty amine
1. Introduction

fatty amine is a kind of important organic chemical raw materials, widely used in pesticides, pharmaceuticals, dyes, surfactants, rubber additives and other fields. With the continuous progress of science and technology, the manufacturing methods of fatty amines have also been continuously developed. This article will introduce several common fatty amine manufacturing methods.

2. amination method

amination method is a common fatty amine manufacturing method, mainly through the aminating agent and alcohol or aldehyde and other compounds to generate the corresponding fatty amine. Commonly used aminating agents include ammonia, ammonium salts, amides, and the like.

1. ammonolysis

ammonolysis method is the alcohol and ammonia in high temperature, high pressure reaction, generate the corresponding aliphatic amine and water. The advantages of this method are that the raw materials are easily available and the operation is simple, but the reaction conditions are relatively harsh, and high temperature and high pressure equipment is required.

2. alcoholysis

alcoholysis is the reaction of aldehydes and alcohols in the presence of acidic catalysts to generate the corresponding aliphatic amines and water. The advantage of this method is that the reaction conditions are relatively mild, and different types of aliphatic amines such as primary, secondary and tertiary amines can be selectively generated.

3. Reduction

Reduction is the reduction of nitro or nitroso compounds to the corresponding aliphatic amines by a reducing agent. Commonly used reducing agents include hydrogen, metal hydrides, sulfides, and the like.

1. catalytic hydrogenation method

catalytic hydrogenation method is in the presence of a catalyst, the nitro compound with hydrogen reaction, generating the corresponding aliphatic amine. The advantages of this method are mild reaction conditions and high selectivity, but the preparation and regeneration of the catalyst are difficult.

2. Chemical reduction method

Chemical reduction method is to reduce nitro or nitroso compounds to the corresponding aliphatic amines with chemical reducing agents. Commonly used reducing agents include iron powder, ferrous sulfate, hydrochloric acid, etc. The advantages of this method are simple operation and low cost, but it produces more waste water and has higher environmental protection requirements.

4. Rearrangement

Rearrangement is the conversion of a hydrocarbyl compound to the corresponding aliphatic amine by a rearrangement reaction. Commonly used rearrangement reactions include Hofmann rearrangement, Curtis rearrangement, etc.

1. Hofmann rearrangement

Hofmann rearrangement is the reaction of amide with bromine in the presence of an acidic catalyst to produce the corresponding aliphatic amine and carbon dioxide. The advantage of this method is that many types of fatty amines can be synthesized, but a large amount of waste gas and waste water will be produced during the reaction.

2. Curtis rearrangement

The Curtis rearrangement is the reaction of an imide with a halogenated hydrocarbon in the presence of a basic catalyst to produce the corresponding aliphatic amine and carbon dioxide. The advantage of this method is that different types of aliphatic amines can be selectively synthesized, but the preparation and regeneration of the catalyst is difficult.

5. conclusion

fatty amine manufacturing methods are varied, different methods have advantages and disadvantages, should be selected according to the specific production conditions and needs. In the future development, with the continuous improvement of environmental awareness and the continuous progress of science and technology, the manufacturing method of fatty amine will be more environmentally friendly, efficient and economical.

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