Manufacturing method of dimethylethanolamine
Dimethylethanolamine (DMEA) is an important organic chemical raw material, which is widely used in pesticides, pharmaceuticals, fuels, rubber, lubricants and other fields. This article will introduce the manufacturing method of dimethylethanolamine.
I. Raw material preparation
The main raw materials for manufacturing dimethylethanolamine are dimethylamine and ethylene oxide. Dimethylamine can be made by the reaction of ammonia and methanol, and ethylene oxide can be made by ethylene oxidation.
II. Reaction process
1. Dimethylamine and ethylene oxide are added into the reactor according to a certain molar ratio, generally the molar ratio of dimethylamine and ethylene oxide is 1:1.1-1.2.
2. The reaction is carried out at a certain temperature and pressure to produce dimethylethanolamine and water. The reaction equation is as follows:
(CH3)2NH + CH2O → (CH3)2NCH2CH2OH + H2O
3. Temperature and pressure need to be controlled during the reaction to ensure the smooth progress of the reaction. The general reaction temperature is 80-120°C and the reaction pressure is 0.5-1.5 MPa.
3. Product separation and purification
After the reaction is finished, the product needs to be separated and purified. The method of distillation is generally used to separate dimethylethanolamine and water. Care needs to be taken to control the temperature and pressure during distillation to avoid decomposition and loss of the product. The obtained dimethylethanolamine product needs to be quality tested to ensure that its purity meets the requirements.
Four, waste disposal
The process of manufacturing dimethylethanolamine will produce some waste, such as wastewater, exhaust gas and so on. These wastes need to be properly treated to avoid harming the environment and human body. Generally, biochemical treatment, adsorption, incineration and other methods are used to treat the waste.
V. Safe production and protective measures
The process of manufacturing dimethylethanolamine requires attention to safe production and protective measures. Relevant safety production regulations and operating procedures should be strictly observed to avoid accidents. At the same time, it should be equipped with perfect protective facilities and emergency rescue equipment to ensure the personal safety of employees.
In short, the manufacturing method of dimethylethanolamine needs to strictly control the quality of raw materials, reaction conditions and the process of product separation and purification, and at the same time, strengthen the safe production and protective measures to ensure the quality of the product and the safety of production.
