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[Chemical Knowledge]：Manufacturing method and process of dimethyl ethanolamine

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The manufacturing method
of dimethylethanolamine
Dimethylethanolamine (DMEA) is an important organic chemical raw material, which is widely used in pesticide, medicine, fuel, rubber, lubricant and other fields. This article will introduce the manufacturing method of dimethylethanolamine.

1. Raw Materials Preparation

The main raw materials for the manufacture of dimethylethanolamine are dimethylamine and ethylene oxide. Dimethylamine can be produced by the reaction of ammonia and methanol, and ethylene oxide can be produced by the oxidation of ethylene.

2. reaction process

1. dimethylamine and ethylene oxide are added to the reactor according to a certain molar ratio, and the molar ratio of dimethylamine and ethylene oxide is generally 1:1.1-1.2.
2. At a certain temperature and pressure, the reaction is carried out to produce dimethylethanolamine and water. The reaction equation is as follows:

(CH3)2NH CH2O → (CH3)2NCH2CH2OH H2O

3. The temperature and pressure need to be controlled during the reaction to ensure the smooth progress of the reaction. Generally, the reaction temperature is 80-120 ° C. and the reaction pressure is 0.5-1.5MPa.

3. product isolation and purification

After the reaction is completed, the product needs to be isolated and purified. Dimethylethanolamine and water are generally separated by distillation. It is necessary to control the temperature and pressure during the distillation process to avoid decomposition and loss of the product. The resulting dimethylethanolamine product needs to be quality tested to ensure that its purity meets the requirements.

4. waste treatment

in the process of manufacturing dimethyl ethanolamine will produce some waste, such as waste water, waste gas and so on. This waste needs to be properly disposed of to avoid harm to the environment and humans. Generally, the waste is treated by biochemical treatment, adsorption, incineration and other methods.

5. safety production and protective measures

should pay attention to safety production and protective measures in the process of manufacturing dimethylethanolamine. Should strictly abide by the relevant safety production regulations and operating procedures to avoid accidents. At the same time, it should be equipped with complete protective facilities and emergency rescue equipment to ensure the personal safety of employees.

In short, the manufacturing method of dimethylethanolamine requires strict control of the quality of raw materials, reaction conditions and the process of product separation and purification, while strengthening safe production and protective measures to ensure product quality and production safety.

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