Manufacturing method of Ethylene Glycol Monoethyl Ether
Ethylene Glycol Monoethyl Ether (EGME) is a commonly used raw material for the production of chemicals, which is widely used in the fields of coatings, cleaning agents, printing inks and so on. This article will introduce the manufacturing method of Ethylene Glycol Monoethyl Ether.
I. Manufacturing Principle
The manufacturing principle of ethylene glycol monoethyl ether is mainly through the esterification reaction between ethylene glycol and ethanol in the presence of acid catalyst to produce ethylene glycol monoethyl ether and water. The reaction equation is as follows:
CH3CH2OH + HOCH2CH2OH → HOCH2CH2OCH2CH3 + H2O
2. Manufacturing Steps
1. Ingredients
According to a certain proportion of ethylene glycol and ethanol are added to the reactor, and the appropriate amount of acid catalyst is added.
2. Heating reaction
Turn on the reactor heating device, control the reaction temperature within a certain range, so that ethylene glycol and ethanol under the action of catalyst for esterification reaction.
3. Separation and purification
After the reaction is finished, the reaction solution is distilled to separate out ethylene glycol monoethyl ether and water. Temperature and pressure need to be controlled during distillation to ensure product purity.
4. Refining
Refine the glycol monoethyl ether obtained by distillation, remove the impurities, and obtain high quality glycol monoethyl ether products.
3. Precautions
1. Selection of catalyst
Selection of suitable acid catalyst has a great influence on the reaction speed and product purity. Common catalysts are sulfuric acid, hydrochloric acid and so on.
2. Control of reaction temperature
Too high reaction temperature may lead to the occurrence of side reaction and affect the purity of the product; too low reaction temperature may affect the reaction speed. Therefore, the reaction temperature should be reasonably controlled.
3. Selection and maintenance of equipment
Select suitable reactor and distillation equipment, and carry out regular maintenance and repair to ensure the normal operation of the equipment and product quality.
4. Environmental protection and safety
In the manufacturing process of ethylene glycol monoethyl ether, it is necessary to pay attention to environmental protection and safety. Effective treatment of wastewater, waste gas and other pollutants generated to reduce the impact on the environment. At the same time, strengthen the safety management of the production site to ensure the personal safety of employees. In conclusion, the manufacture of ethylene glycol monoethyl ether needs to master the appropriate manufacturing principles, steps and precautions, and pay attention to environmental protection and safety, in order to improve the quality and yield of the product. In the actual production process, it also needs to be optimized and adjusted according to the specific situation, in order to meet the demand for glycol monoethyl ether in different fields.
