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[Chemical Knowledge]：Manufacturing method and process of NPG

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N-Propyl ethylenediamine (NPG) is an important chemical raw material, widely used in lubricants, fuel additives, pesticides, pharmaceutical intermediates and other fields. This paper will introduce a manufacturing method of NPG, which uses acrylonitrile as raw material and produces NPG through multi-step reaction.

1. raw materials and equipment

1 raw materials: acrylonitrile, hydrogen, ammonia, sodium hydroxide.
2. Equipment: reactor, condenser, separator, storage tank, pump, valve, etc.

2. Manufacturing Steps

1. Acrylonitrile Hydrogenation Reaction

Acrylonitrile and hydrogen are mixed in a certain proportion, added into a reactor, and under the action of a catalyst, a hydrogenation reaction is carried out to generate propionitrile.

2. Propionitrile hydrolysis reaction

Propionitrile and water are mixed, sodium hydroxide solution is added, heated to a certain temperature, hydrolysis reaction is carried out, propionamide is generated.

3. Propionamide amination Reaction

Propionamide is mixed with ammonia gas and added into a reactor to carry out amination reaction at a certain temperature and pressure to generate N-propyl propionamide.

4. N-Propylamide Dehydrogenation Reaction

N-Propylamide is added into a reactor, hydrogen is introduced into the reactor, and the dehydrogenation reaction is carried out at a certain temperature and pressure to generate N-propyl ethylenediamine (NPG).

3. Precautions

1. Control the temperature, pressure, material ratio and other parameters of each reaction step to ensure the smooth progress of the reaction.
2. Use high-quality catalysts to improve reaction efficiency and product purity.
3. Regularly carry out equipment maintenance and overhaul to ensure the normal operation of the equipment.

4. safety and environmental protection

1. Strengthen staff safety training and improve safety awareness.
2. Strictly implement the operation procedures to prevent the occurrence of safety accidents.
3. Strengthen the safety management of the production site to ensure the safety of production equipment and personnel.
4. Strengthen the environmental protection treatment of waste gas and waste water to ensure the discharge standard.

5. Summary

This article introduces a method for manufacturing NPG from acrylonitrile as raw material. The method includes acrylonitrile hydrogenation reaction, propionitrile hydrolysis reaction, propionamide amination reaction and N-propylpropionamide Dehydrogenation reaction and other steps. In the manufacturing process, it is necessary to control the parameters of each reaction step, use high-quality catalysts, strengthen equipment maintenance and overhaul, and ensure production safety and environmental protection. At the same time, it is necessary to strengthen staff safety training and environmental awareness, improve production efficiency and product quality, and create better economic and social benefits for enterprises.

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